MEP QUESTIONS NOV -2012
1. Impingement corrosion is a
A. Physical action
B. CHEMICAL action
C. Physical and chemical action
D. None of the above
2. It has been reported that Engine room bilge pump was unable to take suction from Fwd. (P) bilge well while it taking suction efficiently from Fwd.(S) & aft bilge wells. What could be the most probable cause?
A. There is leakage in the bilge suction pipeline somewhere between the bilge wells and bilge pump
B. The Fwd. (P) bilge well suction valve might be leaking
C. The Fwd. (P) bilge well suction filter cover gasket might be leaking
D. The pump needs to be overhauled
1. Impingement corrosion is a
A. Physical action
B. CHEMICAL action
C. Physical and chemical action
D. None of the above
2. It has been reported that Engine room bilge pump was unable to take suction from Fwd. (P) bilge well while it taking suction efficiently from Fwd.(S) & aft bilge wells. What could be the most probable cause?
A. There is leakage in the bilge suction pipeline somewhere between the bilge wells and bilge pump
B. The Fwd. (P) bilge well suction valve might be leaking
C. The Fwd. (P) bilge well suction filter cover gasket might be leaking
D. The pump needs to be overhauled
3. Which of the following is NOT a
correct point for sampling of system lube oil for on board or shore analysis?
A. Standpipes
B. Purifier outlets
C. Inlet or outlet of L. O. coolers
D. Tank drains
A. Standpipes
B. Purifier outlets
C. Inlet or outlet of L. O. coolers
D. Tank drains
4. The ballast valve of the fore
peak tank is located in the duct keel and cannot be opened or shut by remote
operation. The valves of other tanks can be operated remotely without any
trouble which of the following will be the best practice?
A. Valve should be checked locally for troubleshooting without which it is difficult to find the exact problem
B. The actuator must be defective and should be replaced with a new one
C. The control circuit is defective and the PCB should be replaced
D. Shore assistance will be required in such cases
A. Valve should be checked locally for troubleshooting without which it is difficult to find the exact problem
B. The actuator must be defective and should be replaced with a new one
C. The control circuit is defective and the PCB should be replaced
D. Shore assistance will be required in such cases
5. Pump Start But Motor gets
overloaded or Trip on overload. ( multiple answer)
A. Alignment is wrong
B. Gland packing too tight
C. Worn out / Damaged ball bearing
D. Cavitation exists
A. Alignment is wrong
B. Gland packing too tight
C. Worn out / Damaged ball bearing
D. Cavitation exists
6. The most important control
measure to prevent boiler tube failure is:
A. Use of proper refractory material
B. Proper maintenance of fuel burning equipment
C. Proper maintenance of boiler water condition
D. All of the above
A. Use of proper refractory material
B. Proper maintenance of fuel burning equipment
C. Proper maintenance of boiler water condition
D. All of the above
7. During flooding of a dry dock the
following items must be verified
A. All sea valves are operational
B. All overboard discharge valves are operational
C. Stern tube seal are operational
D. All of the above
A. All sea valves are operational
B. All overboard discharge valves are operational
C. Stern tube seal are operational
D. All of the above
8. When running TWO centrifugal
Pumps in parallel, Flow rate "Q" is increased.
A. TRUE
B. False
C. May Be
D. I Don't know
A. TRUE
B. False
C. May Be
D. I Don't know
9. In which of the following types
of refractory failure, softening of the refractory bricks takes place due to
presence of sodium/vanadium in fuel?
A. Spalling
B. Cracking
C. Shrinkage cracking
D. Slagging
A. Spalling
B. Cracking
C. Shrinkage cracking
D. Slagging
10. Normally so called single screw
pumps are used as sludge pumps in engine room. What is the correct technical
name of these pumps?
A. Snake Pump
B. Screw Pump
C. Progressive cavity pump
D. Gerotor Pump
A. Snake Pump
B. Screw Pump
C. Progressive cavity pump
D. Gerotor Pump
11. A thin layer of electrolyte
trapped in a small pits on a metal surface , and remaining stagnant over a
period of time , may cause :
A. Erosion
B. Bimetallic corrosion
C. Crevice corrosion
D. Corrosion fatigue
A. Erosion
B. Bimetallic corrosion
C. Crevice corrosion
D. Corrosion fatigue
12. The purpose of an evaporator in
the domestic refrigeration system is to
A. Transmit latent heat of evaporation
B. Absorb latent heat of fusion
C. Absorb latent heat of evaporation
D. Transmit latent heat of fusion
A. Transmit latent heat of evaporation
B. Absorb latent heat of fusion
C. Absorb latent heat of evaporation
D. Transmit latent heat of fusion
13. In case of tankers, the speed of
cargo pumps is reduced while stripping, why?
A. To avoid cavitation of the pump as the NPSHa may fall below NPSHr if speed is not reduced
B. To avoid cavitation of pump as the NPSHa may rise above NPSHr if speed is not reduced
C. To prevent the pump from over speeding if it loses suction
D. Decreasing the speed increases the discharge head of the pump which is required to pump out the remaining cargo
A. To avoid cavitation of the pump as the NPSHa may fall below NPSHr if speed is not reduced
B. To avoid cavitation of pump as the NPSHa may rise above NPSHr if speed is not reduced
C. To prevent the pump from over speeding if it loses suction
D. Decreasing the speed increases the discharge head of the pump which is required to pump out the remaining cargo
15. Which of the following statements is False about cleanliness of electric motors?
A. External motor body cleanliness of totally enclosed is important since the body helps to dissipate heat generated
B. Dirt, oil, grease and moisture are primary culprits in deterioration of insulation of stator windings of a motor.
C. High-pressure dry compressed air cleaning is preferred over suction cleaning for stator windings.
D. Dry compressed air at a high pressure can drive in dirt inside windings instead of removing them.
16. The attached vacuum pump of a
ballast pump operates on the principle of a:
A. Centrifugal pump
B. Reciprocating pump
C. Gear Pump
D. Vane Pump
A. Centrifugal pump
B. Reciprocating pump
C. Gear Pump
D. Vane Pump
17. Increasing the rotational speed
of a cargo pump the pump flow rate will:
A. Increase in direct proportion to the increase in speed
B. Decrease in direct proportion to the increase in speed
C. Flow rate doesn't depend upon speed
D. Flow
A. Increase in direct proportion to the increase in speed
B. Decrease in direct proportion to the increase in speed
C. Flow rate doesn't depend upon speed
D. Flow
18. Vacuum priming pumps which work
on the principle of fixed vane pumps require _____________ for___________
clearance between vane tips and casing.
A. Lube oil, lubricating
B. Lube oil, sealing
C. Water, sealing
D. Gland packing, sealing
20. Which one of the following is a type of corrosion :-
A. Electroplating
B. Galvanisation
C. Graphitisation
D. Demulsification
A. Lube oil, lubricating
B. Lube oil, sealing
C. Water, sealing
D. Gland packing, sealing
20. Which one of the following is a type of corrosion :-
A. Electroplating
B. Galvanisation
C. Graphitisation
D. Demulsification
21. The main disadvantages of a reciprocating pump over a Gear pump is that:
A. A gear pump is self priming while a reciprocating pump is not
B. Discharge of a gear pump is not affected by the direction of rotation while that of reciprocating pump is reversed
C. The discharge of reciprocating pump is pulsating and discharge rate is lesser
D. Reciprocating pumps are only available in high capacities and for smaller capacities only gear pumps can be used
22. When centrifugal pump is used to pump a liquid of higher specific gravity the pump Power will
A. increase
B. decrease
C. Will not be affected as the pump power depends only on the flow capacity
D. None of the above
•
As long as the viscosity of a liquid is similar to
that of water, its specific gravity will have no effect on pump performance. It
will, however, directly affect the input power required to pump that particular
liquid. The equation below can be used to compute the horsepower required to
pump liquids of varying specific gravities (where BHP is brake horsepower, Q is
flow in GPM, H is head in feet, SG is specific gravity and Eff is the hydraulic
efficiency of the pump). It assumes a viscosity similar to that of water.
BHP = (Q x H x SG) / (3960 x Eff)
•
Pump power will decrease. Power consumption will
increase.
23. A ball valve is found leaking in service and needs to be overhauled. What type of repairs can be carried out?
A. The ball and seat can be lapped together
B. The ball can be machined while the seat can be replaced
C. Normally both the non-metallic seats get worn out and have to be replaced
D. Normally ball gets damaged and has to be replaced
24. Surface preparation of steel
surfaces, prior carrying out painting isimportant because (choose the best
alternative):
A. Any rust and contaminant inclusions may cause local paint film breakdown
B. Too much paint will be consumed if surface preparation is not carried out
C. Surface will be very rough if proper surface preparation is not carried out
D. Surface preparation deposits a chemical onto steel surface which reacts with paint film and causes
strong bonding
A. Any rust and contaminant inclusions may cause local paint film breakdown
B. Too much paint will be consumed if surface preparation is not carried out
C. Surface will be very rough if proper surface preparation is not carried out
D. Surface preparation deposits a chemical onto steel surface which reacts with paint film and causes
strong bonding
25. Air compressor
cooler tube type
A) Spring type
B) Floating type
C) Fixed tube
D) U tube
A) Spring type
B) Floating type
C) Fixed tube
D) U tube
class 4 preperation part b fromaugust 30th to november 22nd
M.E..P
online question paper
1. when A/E stand by F.O.heater in use of main engine
a. Sudden opening F.O. inlet valve pressurized and damage the heater
b. F.O. in vapour lock inside heater allow steam
c. F.O. inlet valve causes pressure drop M/E F.O. pressure standby water is not pressurized may cause sudden change in engine /per load/rpm
d. heater leaking.
3. Types of corrosion in fresh water of D/E
a. Stress
b. Hot corrosion
c. bimetallic
d. selective phase corrosion
Not preventing cold corrosion in M/E component
a. Running Evy aat high load
b. J/W cooling temp. high
c. High TNB cylinder oil
d. Cooling charge air in air cooler dew point.
4. Not preventing cold corrosion in M/E component
a. Running Evy aat high load
b. J/W cooling temp. high
c. High TNB cylinder oil
d. Cooling charge air in air cooler dew point.
5 Super chlorinating of fresh water tanks in dry dock is done by:
A. Washing the tanks with 100ppm chlorine solution
B. Washing the tanks with 50ppm chlorine solution
C. Leaving a 50ppm chlorine solution in the tank for 4 hours before flushing with clean water
D. Leaving a 50ppm chlorine solution in the tank for 24 hours before flushing with clean water
1. when A/E stand by F.O.heater in use of main engine
a. Sudden opening F.O. inlet valve pressurized and damage the heater
b. F.O. in vapour lock inside heater allow steam
c. F.O. inlet valve causes pressure drop M/E F.O. pressure standby water is not pressurized may cause sudden change in engine /per load/rpm
d. heater leaking.
3. Types of corrosion in fresh water of D/E
a. Stress
b. Hot corrosion
c. bimetallic
d. selective phase corrosion
Not preventing cold corrosion in M/E component
a. Running Evy aat high load
b. J/W cooling temp. high
c. High TNB cylinder oil
d. Cooling charge air in air cooler dew point.
4. Not preventing cold corrosion in M/E component
a. Running Evy aat high load
b. J/W cooling temp. high
c. High TNB cylinder oil
d. Cooling charge air in air cooler dew point.
5 Super chlorinating of fresh water tanks in dry dock is done by:
A. Washing the tanks with 100ppm chlorine solution
B. Washing the tanks with 50ppm chlorine solution
C. Leaving a 50ppm chlorine solution in the tank for 4 hours before flushing with clean water
D. Leaving a 50ppm chlorine solution in the tank for 24 hours before flushing with clean water
7 maintaining correct discharge
pressure, soon ceases to discharge water what are possible cause?
A. Pressure gauge wrong
B. Pump sucking air
C. Discharge valve throttled
D. Casing wear ring is worn
8 An auxiliary engine turbo-charged makes strange noises when the load changes. The engine parameters however are absolutely fine. An external examination of turbocharger parameters as stated in the manual also reveals nothing. Would you
(a) Continue to run the engine and wait for some time
(b) Stop the engine for a while and make some checks
(c) Reduce the load of the engine
(d) Run it on steady load to make some checks.
9 During prolonged astern manoeuvring of the relative expansion between any of the turbine its casing is likely to increase for an alarming level you should (multi choice) in photo no3 in download
A) Inform the bridge that no further manoeuvring is possible as the turbine are likely to be damaged
B) Reduce the vacuum further to control the relative expansion
C) Keep manoeuvring irrespective of damage to the turbines
D) Request the bridge to try to reduce number of astern movements
10 Refer cooling tubes act as self-cooling & expansion by
a) Straight tube
b) U tube
c) Spring tube
A. Pressure gauge wrong
B. Pump sucking air
C. Discharge valve throttled
D. Casing wear ring is worn
8 An auxiliary engine turbo-charged makes strange noises when the load changes. The engine parameters however are absolutely fine. An external examination of turbocharger parameters as stated in the manual also reveals nothing. Would you
(a) Continue to run the engine and wait for some time
(b) Stop the engine for a while and make some checks
(c) Reduce the load of the engine
(d) Run it on steady load to make some checks.
9 During prolonged astern manoeuvring of the relative expansion between any of the turbine its casing is likely to increase for an alarming level you should (multi choice) in photo no3 in download
A) Inform the bridge that no further manoeuvring is possible as the turbine are likely to be damaged
B) Reduce the vacuum further to control the relative expansion
C) Keep manoeuvring irrespective of damage to the turbines
D) Request the bridge to try to reduce number of astern movements
10 Refer cooling tubes act as self-cooling & expansion by
a) Straight tube
b) U tube
c) Spring tube
11 . How is manual desludging
carried out if automatic fails in purifier? hat will be your first step of
action?
MEP ONLINE QUESTIONS
2. The direction of centrifugal pump depends upon what
a. Vane curvature fr eye to impeller
b. Vane curvature fr impeller to eye
c. Direction of volute casing
3. Main engine lube oil pump immersed is a centrifugal pump (reasons)
4. Fresh water generator condenser sea water temp increases. What r the possible reasons?
5. Which of the foll. is not a corrosion option Lyk-dezincification, graphitization,d
chromising, galvanization.
2. The direction of centrifugal pump depends upon what
a. Vane curvature fr eye to impeller
b. Vane curvature fr impeller to eye
c. Direction of volute casing
3. Main engine lube oil pump immersed is a centrifugal pump (reasons)
4. Fresh water generator condenser sea water temp increases. What r the possible reasons?
5. Which of the foll. is not a corrosion option Lyk-dezincification, graphitization,d
chromising, galvanization.
6.Purifier not rotating wid desired rpm. reason
a. frequency low
b.busbar voltage low
c. friction pads worn out
2. The direction of centrifugal pump depends upon what
a. Vane curvature fr eye to impeller
b. Vane curvature fr impeller to eye
c. Direction of volute casing
7. Purifier leaking bowl opened, cleaned n seal ring changed n putback bt still leaking
wat might b wrong
a. high temp
b. high density
c. disc size nt proper
d. rpm low
How to remove corroded
screw,bolt,nut that are stuck.
MEP ONLINE QUESTIONS
PLZ SOLVE THIS
2-centrifugal pp dismantled without marking hw to reassemble(3 ques on dis)
1)if pp is single stage
2)if pp is multisatge wid oppsite eye
3)if pp is double entry impeller
3- brass 70cu & 30 Zn/bronze – 88copper + 12 tin /gunmetal 88 cu + 10 tin + 2 Zn composition
PLZ SOLVE THIS
2-centrifugal pp dismantled without marking hw to reassemble(3 ques on dis)
1)if pp is single stage
2)if pp is multisatge wid oppsite eye
3)if pp is double entry impeller
3- brass 70cu & 30 Zn/bronze – 88copper + 12 tin /gunmetal 88 cu + 10 tin + 2 Zn composition
4- sherardising chromising clarising are methods of protection from corrosion by which method,
a)electroplating b)galvanisation c)metal diffusion d)cladding
Electroplating is a plating process in
which metal ions in a solution are moved by an electric field to coat an electrode. The process uses
electricalcurrent to reduce cations of a desired material from a solution and
coat a conductive object
with a thin layer of the material, such as a metal. Electroplating is primarily
used for depositing a layer of material to bestow a desired property
(e.g., abrasion and wear
resistance, corrosion protection,lubricity, aesthetic
qualities, etc.) to a surface that otherwise lacks that property. Another
application uses electroplating to build up thickness on undersized parts.
Galvanization (or galvanisation) is the process of applying a
protective zinc coating
to steel or iron, in order to prevent rusting. The term is
derived from the name of Italian scientist Luigi Galvani. Although
galvanization can be done with electrochemical and electrodeposition processes,
the most common method in current use is hot-dip galvanization, in which steel
parts are submerged in a bath of molten zinc.
Metal diffusion
bonds include Cu-Cu, Al-Al, Au-Au and others metallurgies that enable better
hermeticity than traditional glass frit and anodic bonds. In addition, the use
of metal diffusion bonds in 3D applications allows the mechanical and
electrical connections to be made between two wafers in one step. Metal
diffusion also enables superior post bond alignment accuracy over glass frit
bonding. Aluminum metallization is used frequently in MEMS device structures
and offers the potential to serve as a sealing metallurgy during device
packaging steps via a diffusion reaction.
Cladding is
the covering of one material with another. Cladding is the bonding together of dissimilar metals. It is different from fusion welding or gluing as a method
to fasten the metals together. Cladding is often achieved by extruding two metals
through a die as well
as pressing or rolling sheets
together under high pressure.
5- method of improving
corrosion resistance of metal by adding chromium by metal diffusion is
called______chromonisation_____
6-why metal cladding is bttr method of improving strength
7-galvanic series based quest (like arrange in increasing/decreasing order, study complete series alloys ver also askd)
8-degree of motion
9-centrifugal fire pp #1 shows discharge pressure 5 bar bt no water on deck.u urself has ascertained dat all relevent valves r open n shut correctly.nw fire pp #2 started n water is delivrd on dect with 2.5 bar pr on hydrant.wat iz wrong wid pp #1
10-trouble shooting question like bilge pp or sludge pp nt taking suction(3-4 ques)
13-hfo tfr pp was working efficiently. pp stopped nd started wen nxt tym no fuel deliverd,wat might b reason,head of 6m in tank present
14-which pp will delivr fluid in opposite direction, wen direction of rotation is reversd gear p/p
16-ref plant cmprsr running for longer tym.reason under charge(big bubble in sight glass)
17-air in ref plant reason no proper purging after overhauling
18-moisture in ref plant,hw it is indicated small bubbles in the sight glass
19-which pp used fr high speed application centrifugal p/p
20-vicosity of fuel oil used for ME was 145cst,new fuel comes whose vicosity was more dan earlier,wat shud u do
increase temp setting/change setting of vicotherm/do nothing/open steam valve manually more
21-wat kind of corrosion if outlet of heat xchngr throttled n der is turbulence in HX
22-correct p'dure to open up HX for overhaul
23-correct p'dure fr sea chest opening up
24-frm whr ball vv leaks most of da tym
25-which vv is nt rotaing type
ball/buttrfly/gate/plug
26-buutrfly vv stuck in half open position.hw to repair
cant b taken out in open position frm line so try to close vv anyhow/apply hammer to shut it/remove pipeline nd do da overhaul/cannot b repaired onboard
27-why copper tube is used ref plant – it has less internal resistance
28-wat factors contribute to lower efficiency/low pr dvlpmnt in centrifugal pp
29-wat vil lead to overload trip in centrifugal pp
worn brg/tight gland packing/cavitation
6-why metal cladding is bttr method of improving strength
7-galvanic series based quest (like arrange in increasing/decreasing order, study complete series alloys ver also askd)
8-degree of motion
9-centrifugal fire pp #1 shows discharge pressure 5 bar bt no water on deck.u urself has ascertained dat all relevent valves r open n shut correctly.nw fire pp #2 started n water is delivrd on dect with 2.5 bar pr on hydrant.wat iz wrong wid pp #1
10-trouble shooting question like bilge pp or sludge pp nt taking suction(3-4 ques)
13-hfo tfr pp was working efficiently. pp stopped nd started wen nxt tym no fuel deliverd,wat might b reason,head of 6m in tank present
14-which pp will delivr fluid in opposite direction, wen direction of rotation is reversd gear p/p
16-ref plant cmprsr running for longer tym.reason under charge(big bubble in sight glass)
17-air in ref plant reason no proper purging after overhauling
18-moisture in ref plant,hw it is indicated small bubbles in the sight glass
19-which pp used fr high speed application centrifugal p/p
20-vicosity of fuel oil used for ME was 145cst,new fuel comes whose vicosity was more dan earlier,wat shud u do
increase temp setting/change setting of vicotherm/do nothing/open steam valve manually more
21-wat kind of corrosion if outlet of heat xchngr throttled n der is turbulence in HX
22-correct p'dure to open up HX for overhaul
23-correct p'dure fr sea chest opening up
24-frm whr ball vv leaks most of da tym
25-which vv is nt rotaing type
ball/buttrfly/gate/plug
26-buutrfly vv stuck in half open position.hw to repair
cant b taken out in open position frm line so try to close vv anyhow/apply hammer to shut it/remove pipeline nd do da overhaul/cannot b repaired onboard
27-why copper tube is used ref plant – it has less internal resistance
28-wat factors contribute to lower efficiency/low pr dvlpmnt in centrifugal pp
29-wat vil lead to overload trip in centrifugal pp
worn brg/tight gland packing/cavitation
31-sudden shut down of
engine.reason (multiple choice)
air in fuel/water in fuel/water in air filter
33-while stopping purifier abnormally vibrating,reason
37-suction lift n suction head in centrifugal pp
air in fuel/water in fuel/water in air filter
33-while stopping purifier abnormally vibrating,reason
37-suction lift n suction head in centrifugal pp
M.E.P ONLINE QUESTIONS
( ANY IDEA WHAT WILL BE CORRECT OPTIONS .waITING FOR UR COMMENTS DEAR FRIENDS)
8) Pump driven type clutch attached to vacuum pump r commonly used for
priming ballast pump n emergency fir pump. What is the factor which
clutches the vacuum pump to pump the clutch during start of the pump.
A) Low suction pressure acting against the spring loaded clutching piston
B) High suction pressure actiong against the spring loaded clutching piston
C) Low discharge pressure acting against the spring loaded clutching piston
D) High discharge pressure acting against the spring loaded clutching piston
12) Sludge pump suction pressure is going full vacuum when u start the pump
taking water of double bottom tank suction u hv checked the suction filter
n found in clean condition. Taking suction fr fuel oil sludge tank does not
happen. Causes of the problem.
A) Pump is not working efficiently n reqd. overhauling
B) F>O> sludge tank suction valve is leaking
C) W.O. tank D.B. tank suction pipeline has a blockage.
D) Can ??? say what is the problem but definiterly the pump needs to
b opened up for overhaul
13. The difference between the discharges of a centrifugal pump n reci pump
the discharge of centrifugal pump is ----------while that if reci is ---------
A) Turbulent, Laminar
B) Intermittent continuous
C) Continuous pulsating
D) Pulaating continuous
14) Which of the foll. is a true statement
A) Aluminium wl b subject to preferential corrosion when in electrical
continuity with stainless steel in presence of an electrolyte.
b) Stainless steel wl b subject to preferential corrosion when in electrical
continuity with mild steel in presence of an electrolyte.
C) Copper wl b subject to preferential corrosion when in electrical
continuity with stainlesssteel in presence of an electrolyte
d) Aluminium wl b subject to preferential corrosion when in electrical continuity
with zinc in presence of an electrolyte.
15. Ballast pump injection filter was cleaned n the pump was lined up it was
found that there was some leakage in the suction filter suction. The pump
started n the leakage started. During deblasting it was found that the pump
could not take ssuction fr one of the double bottoms. The cause could b
A) Pump was drawing air fr.
B) Pump was drawing air fr suction filter
C) One of thepipelines on the suction side of the pump might be leaking
D) The filter was not cleaned properly.
( ANY IDEA WHAT WILL BE CORRECT OPTIONS .waITING FOR UR COMMENTS DEAR FRIENDS)
8) Pump driven type clutch attached to vacuum pump r commonly used for
priming ballast pump n emergency fir pump. What is the factor which
clutches the vacuum pump to pump the clutch during start of the pump.
A) Low suction pressure acting against the spring loaded clutching piston
B) High suction pressure actiong against the spring loaded clutching piston
C) Low discharge pressure acting against the spring loaded clutching piston
D) High discharge pressure acting against the spring loaded clutching piston
12) Sludge pump suction pressure is going full vacuum when u start the pump
taking water of double bottom tank suction u hv checked the suction filter
n found in clean condition. Taking suction fr fuel oil sludge tank does not
happen. Causes of the problem.
A) Pump is not working efficiently n reqd. overhauling
B) F>O> sludge tank suction valve is leaking
C) W.O. tank D.B. tank suction pipeline has a blockage.
D) Can ??? say what is the problem but definiterly the pump needs to
b opened up for overhaul
13. The difference between the discharges of a centrifugal pump n reci pump
the discharge of centrifugal pump is ----------while that if reci is ---------
A) Turbulent, Laminar
B) Intermittent continuous
C) Continuous pulsating
D) Pulaating continuous
14) Which of the foll. is a true statement
A) Aluminium wl b subject to preferential corrosion when in electrical
continuity with stainless steel in presence of an electrolyte.
b) Stainless steel wl b subject to preferential corrosion when in electrical
continuity with mild steel in presence of an electrolyte.
C) Copper wl b subject to preferential corrosion when in electrical
continuity with stainlesssteel in presence of an electrolyte
d) Aluminium wl b subject to preferential corrosion when in electrical continuity
with zinc in presence of an electrolyte.
15. Ballast pump injection filter was cleaned n the pump was lined up it was
found that there was some leakage in the suction filter suction. The pump
started n the leakage started. During deblasting it was found that the pump
could not take ssuction fr one of the double bottoms. The cause could b
A) Pump was drawing air fr.
B) Pump was drawing air fr suction filter
C) One of thepipelines on the suction side of the pump might be leaking
D) The filter was not cleaned properly.
17. When one of the M/E.F.O. heater
is not in use then
A) The F.O. inlet n outlet valve should b kept shut, but steam heating
valves should b kept crack open so as to keep the heater warm.
B) F.O. inlet n outlet valve should b kept shut n heating valves also
should b completely shut n should b drained of any remaining F.O.
c) F.O. inlet n outlet valve should b kept crack open so that the F.O.
recirculation can take place.
d) F.O. inlet n outlet valve should b kept shut while outlet valve should be
left open so that
17. The gland packing of centrifugal pump should hv
A) Not allow any breakage under the suction pressure.
B) Should only allow drop by drop continuous leakage under positive suction
pressure.
C) Should allow considerable leakage
18. Corrosion of mild steel can b effectively prevented by
A) Cathodic protection
B) Protective coatings
C) Addition of suitable alloying elements
19. U hv to dismantle a F.O. heater for cleaning . U hv closed both inlet
n outlet valves of the heater, both for F.O. n steam side. What wl U do before
u start opening the heater?
A) There is nothing more to b done, if u know the valves r holding u can straight away start opening the heater without wasting time.
B) Drain the heater till pressure gauge reads zero n then start opening the heater.
C) Drain the heater till F.O. stops coming out of the drain n then start opening) the heater.
D) First open the vent valve n allow the heater to depressurize. N then open
the drain valve to drain the contents of the heater.
20. Sequence of metal in the increasing order of noblety in galvanic series
A) Stainless steel , Mild steel, Copper, Zinc
B) Copper, Stainless steel, Mild steel, Zinc.
C) Zinc, Mild steel, Stainless steel, Copper.
D) Zinc, Copper, Stainless steel, Mild steel.
A) The F.O. inlet n outlet valve should b kept shut, but steam heating
valves should b kept crack open so as to keep the heater warm.
B) F.O. inlet n outlet valve should b kept shut n heating valves also
should b completely shut n should b drained of any remaining F.O.
c) F.O. inlet n outlet valve should b kept crack open so that the F.O.
recirculation can take place.
d) F.O. inlet n outlet valve should b kept shut while outlet valve should be
left open so that
17. The gland packing of centrifugal pump should hv
A) Not allow any breakage under the suction pressure.
B) Should only allow drop by drop continuous leakage under positive suction
pressure.
C) Should allow considerable leakage
18. Corrosion of mild steel can b effectively prevented by
A) Cathodic protection
B) Protective coatings
C) Addition of suitable alloying elements
19. U hv to dismantle a F.O. heater for cleaning . U hv closed both inlet
n outlet valves of the heater, both for F.O. n steam side. What wl U do before
u start opening the heater?
A) There is nothing more to b done, if u know the valves r holding u can straight away start opening the heater without wasting time.
B) Drain the heater till pressure gauge reads zero n then start opening the heater.
C) Drain the heater till F.O. stops coming out of the drain n then start opening) the heater.
D) First open the vent valve n allow the heater to depressurize. N then open
the drain valve to drain the contents of the heater.
20. Sequence of metal in the increasing order of noblety in galvanic series
A) Stainless steel , Mild steel, Copper, Zinc
B) Copper, Stainless steel, Mild steel, Zinc.
C) Zinc, Mild steel, Stainless steel, Copper.
D) Zinc, Copper, Stainless steel, Mild steel.
Composition of
Brass,Bronze,Aluminium Bronze
brass-
copper+zinc , bronze-copper+tin(88copper + 12 tin), aluminium bronze- bronze
wid aluminium as parent metal
gun
metal is copper,zinc nd tin
88
copper 10 tin nd 2 zinc
brass-
70 copper nd 30 zinc
COATING IN WELDING ROD
flux:aluminium
oxide,sodium oxide,calcium oxide
Wht are the values of Max Pressure
(P Max) and Mean Effective Pressure (MEP) in the two stroke and 4 stroke
engines?
Wht are the values of Max Pressure
(P Max) and Mean Effective Pressure (MEP) in the two stroke and 4 stroke
engines?
BMEP
typical values Naturally aspirated spark-ignition engines : Maximum BMEP in the
range 8.5 to 10.5 bar (850 to 1050
kPa; 125 to 150 lbf/in2), at the
engine speed where maximum
torque is obtained. At rated power,
bmep values are typically 10 to 15% lower.[2] Boosted spark ignition engines : Maximum BMEP in the 12.5 to 17 bar
range (1.25 to 1.7 MPa; 180 to
250 lbf/in2).[3] Naturally aspirated four-stroke diesels: Maximum BMEP in the 7 to 9
bar range (700 to 900 kPa; 100 to
130 lbf/in2).[4] Boosted automotive four-stroke diesels : Maximum BMEP in the 14 to
18 bar (1.4 to 1.8 MPa; 200 to
269 lbf/in2) range. Two-stroke diesels have comparable values, but very large
low speed diesels like the Wärtsilä- Sulzer RTA96-C can run at BMEPs of up to 19 bar (1.9 MPa; 275 lbf/in2). Ultra boosted engines such as the engine used in the Koenigsegg Agera can run at BMEPs as high as 28 bar Top Fuel dragster engines: 80–100 bar (8.0-10 MPa)
range 8.5 to 10.5 bar (850 to 1050
kPa; 125 to 150 lbf/in2), at the
engine speed where maximum
torque is obtained. At rated power,
bmep values are typically 10 to 15% lower.[2] Boosted spark ignition engines : Maximum BMEP in the 12.5 to 17 bar
range (1.25 to 1.7 MPa; 180 to
250 lbf/in2).[3] Naturally aspirated four-stroke diesels: Maximum BMEP in the 7 to 9
bar range (700 to 900 kPa; 100 to
130 lbf/in2).[4] Boosted automotive four-stroke diesels : Maximum BMEP in the 14 to
18 bar (1.4 to 1.8 MPa; 200 to
269 lbf/in2) range. Two-stroke diesels have comparable values, but very large
low speed diesels like the Wärtsilä- Sulzer RTA96-C can run at BMEPs of up to 19 bar (1.9 MPa; 275 lbf/in2). Ultra boosted engines such as the engine used in the Koenigsegg Agera can run at BMEPs as high as 28 bar Top Fuel dragster engines: 80–100 bar (8.0-10 MPa)
e
pariksha class 4 ( mep 11 questions)
M.E..P online question paper
10 Refer cooling tubes act as self-cooling & expansion by
a) Straight tube
b) U tube
c) Spring tube
11 . How is manual desludging carried out if automatic fails in purifier? hat will be your first step of action?
10 Refer cooling tubes act as self-cooling & expansion by
a) Straight tube
b) U tube
c) Spring tube
11 . How is manual desludging carried out if automatic fails in purifier? hat will be your first step of action?
1st
step wud be to by-pass fuel.
E
pariksha class 4 (mep 12)
Some QSTNS still left to be answerd
..
1. When centrifugal pump is used to pump a liquid of higher specific gravity the pump Power will
A. increase
B. decrease
C. Will not be affected as the pump power depends only on the flow capacity
D. None of the above
2. High tensile steels are :
A. High carbon steels with suitably added alloying elements
B. Medium carbon steels with suitably added alloying elements
C. Low carbon steels with suitably added alloying elements
D. None of the above
3. A drain cooler is provided with S.W. cooling. What is the best way to increase the temperature of condensate draining to the hotwell?
A. Throttle the S.W. inlet valve
B. Throttle the S.W. outlet valve
C. Open the condensate Bypass to the cooler
D. Close the condensate bypass to the cooler
4. Corrosion protection of steel surfaces by zinc coating can be carried out only at temperatures below 65 Deg. C . For higher temperatures :
A. Zinc reacts very fast and thus can only provide protection for a limited time
B. Zinc reacts with steel and protective layer vanishes due to chemical reaction
C. Steel may corrode preferentially to the zinc
D. Dezincification occurs leading to removal of zinc coating
5. Which of the following valves cannot prevent backflow of liquid in a pipeline?
A. Gate valve
B. Globe Check Valve
C. Swing Check Valve
D. Angle check valve
6. Which of the following option gives you the correct sequence of the metals in decreasing order of preferential corrosion when all of them are bonded and immersed in an electrolyte ?
A. Titanium, Mild Steel , Zinc , Stainless steel
B. Titanium , Stainless steel ,Mild Steel ,Zinc
C. Zinc , Mild Steel , Stainless steel , Titanium
D. Zinc , Titanium , Mild Steel , Stainless steel
7. A refrigerant compressor will run continuously when there is
A. Too heavy cooling load on the system
B. Air in the system
C. Insufficient refrigerant in the system
D. Any of the above
8. You have started pumping out a Fore peak tank. The ballast pump is running showing a low discharge pressure but a positive suction pressure,Chief Engineer asks you to throttle the discharge valve to increase the back pressure on the pump. Why do you require to do the same?
A. The pump???s discharge rate needs to be controlled as it is pumping at a higher than rated capacity
B. Chief Engineer wants you to slow down as the deballasting is going on too fast and will finish sooner than expected
C. It is a misconception that pumps operate smoothly at increased back pressure and throttling of the discharge valve is a wrong practice
D. Centrifugal pumps cannot operate at greater than rated capacity, so throttling the discharge valve is only going to decrease the discharge rate below rated capacity
9. Motor stator winding badly contaminated by dirt, oil and grease should be cleaned by:
A. High pressure compressed air
B. Suction or vacuum cleaning
C. Brushing, spraying or immersion in an approved cleaning solvent
D. Immersion in fresh water followed by drying
10. Aluminium being lower than zinc in Galvanic series provides lesser protection to steel compared to the zinc coating . Which one of the following is a true statement :
A. Aluminium coating provides good corrosion protection compared that of zinc at elevated temperatures
B. Zinc is always preferred over aluminium coating irrespective of the temperature of metal surface
C. Aluminium is never used as coating material
D. Aluminium reacts with steel , so cannot be used for coating steel
11. Which of the following statements is False about hydraulic jacks/tensioning tools?
A. The piston of the jack should be turned back by a certain degree after hand tightening to prevent easy removal after un tightening of the nut.
B. The piston of the jack should not be turned back after hand tightening during un tightening of the nut
C. The piston of the jack need not be turned back during tightening of the nut.
D. The hydraulic pressure need not be relieved during removal of the jack.
12. Which of the following is NOT a true statement?
A. Butterfly valves are used for modulating flow and can be throttled
B. Globe Valves can be straight flow or angle flow type
C. Swing check valve will provide lesser resistance than same bore diameter globe type check valve
D. In a globe type valves, mechanical seals are used for providing sealing between the valve bonnet and the spindle
1. When centrifugal pump is used to pump a liquid of higher specific gravity the pump Power will
A. increase
B. decrease
C. Will not be affected as the pump power depends only on the flow capacity
D. None of the above
2. High tensile steels are :
A. High carbon steels with suitably added alloying elements
B. Medium carbon steels with suitably added alloying elements
C. Low carbon steels with suitably added alloying elements
D. None of the above
3. A drain cooler is provided with S.W. cooling. What is the best way to increase the temperature of condensate draining to the hotwell?
A. Throttle the S.W. inlet valve
B. Throttle the S.W. outlet valve
C. Open the condensate Bypass to the cooler
D. Close the condensate bypass to the cooler
4. Corrosion protection of steel surfaces by zinc coating can be carried out only at temperatures below 65 Deg. C . For higher temperatures :
A. Zinc reacts very fast and thus can only provide protection for a limited time
B. Zinc reacts with steel and protective layer vanishes due to chemical reaction
C. Steel may corrode preferentially to the zinc
D. Dezincification occurs leading to removal of zinc coating
5. Which of the following valves cannot prevent backflow of liquid in a pipeline?
A. Gate valve
B. Globe Check Valve
C. Swing Check Valve
D. Angle check valve
6. Which of the following option gives you the correct sequence of the metals in decreasing order of preferential corrosion when all of them are bonded and immersed in an electrolyte ?
A. Titanium, Mild Steel , Zinc , Stainless steel
B. Titanium , Stainless steel ,Mild Steel ,Zinc
C. Zinc , Mild Steel , Stainless steel , Titanium
D. Zinc , Titanium , Mild Steel , Stainless steel
7. A refrigerant compressor will run continuously when there is
A. Too heavy cooling load on the system
B. Air in the system
C. Insufficient refrigerant in the system
D. Any of the above
8. You have started pumping out a Fore peak tank. The ballast pump is running showing a low discharge pressure but a positive suction pressure,Chief Engineer asks you to throttle the discharge valve to increase the back pressure on the pump. Why do you require to do the same?
A. The pump???s discharge rate needs to be controlled as it is pumping at a higher than rated capacity
B. Chief Engineer wants you to slow down as the deballasting is going on too fast and will finish sooner than expected
C. It is a misconception that pumps operate smoothly at increased back pressure and throttling of the discharge valve is a wrong practice
D. Centrifugal pumps cannot operate at greater than rated capacity, so throttling the discharge valve is only going to decrease the discharge rate below rated capacity
9. Motor stator winding badly contaminated by dirt, oil and grease should be cleaned by:
A. High pressure compressed air
B. Suction or vacuum cleaning
C. Brushing, spraying or immersion in an approved cleaning solvent
D. Immersion in fresh water followed by drying
10. Aluminium being lower than zinc in Galvanic series provides lesser protection to steel compared to the zinc coating . Which one of the following is a true statement :
A. Aluminium coating provides good corrosion protection compared that of zinc at elevated temperatures
B. Zinc is always preferred over aluminium coating irrespective of the temperature of metal surface
C. Aluminium is never used as coating material
D. Aluminium reacts with steel , so cannot be used for coating steel
11. Which of the following statements is False about hydraulic jacks/tensioning tools?
A. The piston of the jack should be turned back by a certain degree after hand tightening to prevent easy removal after un tightening of the nut.
B. The piston of the jack should not be turned back after hand tightening during un tightening of the nut
C. The piston of the jack need not be turned back during tightening of the nut.
D. The hydraulic pressure need not be relieved during removal of the jack.
12. Which of the following is NOT a true statement?
A. Butterfly valves are used for modulating flow and can be throttled
B. Globe Valves can be straight flow or angle flow type
C. Swing check valve will provide lesser resistance than same bore diameter globe type check valve
D. In a globe type valves, mechanical seals are used for providing sealing between the valve bonnet and the spindle
E
pariksha class 4 (mep combination of mep 50 and 11 answers r not ri8)
Question 1 MEP-WRITTENS
After maintaining correct discharge pressure , soon ceases to discharge water what are possible cause? (multiple choice)
A. Pressure gauge wrong
B. Pump sucking air
C. Discharge valve throttled
D. Casing wear ring is worn
After maintaining correct discharge pressure , soon ceases to discharge water what are possible cause? (multiple choice)
A. Pressure gauge wrong
B. Pump sucking air
C. Discharge valve throttled
D. Casing wear ring is worn
Question 2
Which of the following can lead to premature failure of roller bearings?
A. Misalignment
B. Contamination
C. Shrinkage
D. Over greasing
Question 5
The flow rate through a F.O. transfer pump will not be affected by which of the following factors?
A. Low F.O. temperature
B. Low sounding in F.O. tank
C. Internal leakage within the pump
D. Leaking discharge valve
The flow rate through a F.O. transfer pump will not be affected by which of the following factors?
A. Low F.O. temperature
B. Low sounding in F.O. tank
C. Internal leakage within the pump
D. Leaking discharge valve
Question 6
Which of the following can be done to reduce the cold corrosion of Main Engine cylinder liners using high sulphur fuel oil :-
A. Increasing cylinder oil feed rate
B. Using high TBN cylinder oil
C. Increasing scavenge air temperature
D. Decreasing cylinder oil feed rate
Which of the following can be done to reduce the cold corrosion of Main Engine cylinder liners using high sulphur fuel oil :-
A. Increasing cylinder oil feed rate
B. Using high TBN cylinder oil
C. Increasing scavenge air temperature
D. Decreasing cylinder oil feed rate
Question 7
Which of the following valves are designed to have valve seat in pairs - one facing the inlet side and the other facing the outlet side within the valve body?
A. Butterfly valve
B. Ball Valve
C. Globe Valve
D. Gate Valve
*Question 8
The size of solid particle contaminants in hydraulic systems is measured in:
A. Millimeter cubed
B. Nano-millimeter
C. Microns
D. Micro millimeter
*Question 9
In Impressed Current Cathodic protection system , the current for cathodic protection is supplied by :
A. Use of sacrificial anodes
B. A low voltage D.C. supply
C. A low voltage A.C. supply
D. 110 V A.C. supply
Question 10
Which of the following can lead to short cycling or frequent cutting in and cutting out of a fridge compressor?
A. Dirty condenser
B. Air entrapped in refrigerant
C. High cooling water temperature
D. Grossly insufficient charge
Which of the following valves are designed to have valve seat in pairs - one facing the inlet side and the other facing the outlet side within the valve body?
A. Butterfly valve
B. Ball Valve
C. Globe Valve
D. Gate Valve
*Question 8
The size of solid particle contaminants in hydraulic systems is measured in:
A. Millimeter cubed
B. Nano-millimeter
C. Microns
D. Micro millimeter
*Question 9
In Impressed Current Cathodic protection system , the current for cathodic protection is supplied by :
A. Use of sacrificial anodes
B. A low voltage D.C. supply
C. A low voltage A.C. supply
D. 110 V A.C. supply
Question 10
Which of the following can lead to short cycling or frequent cutting in and cutting out of a fridge compressor?
A. Dirty condenser
B. Air entrapped in refrigerant
C. High cooling water temperature
D. Grossly insufficient charge
*Question 11
The attached vacuum pump of a ballast pump operates on the principle of a:
A. Centrifugal pump
B. Reciprocating pump
C. Gear Pump
D. Vane Pump
The attached vacuum pump of a ballast pump operates on the principle of a:
A. Centrifugal pump
B. Reciprocating pump
C. Gear Pump
D. Vane Pump
Question 12
After cleaning the sea chest filter you have placed the filter in the body and tightened the cover. Which one of the following is the best alternative?
A. You can open the filter inlet and outlet valves & directly start using the filter
B. If you do not want to use the sea chest in question, you need not worry and you can open the valves when required
C. Sea Water inlet valve should be crack opened, the filter body should be purged, any leakages and thereafter filter can be kept isolated or used as required
D. You will close the other side sea chest valves first and then open this side sea chest filter inlet and outlet valves
*Question 13
The suction pressure gauge of the Engine room bilge pump is broken and you don???t have a spare. Chief Engineer has asked you to troubleshoot the problem with Bilge pump not taking suction from Fwd.(P) bilge well. You try taking suction from Fwd. (S) & Aft Bilge well and find that pump is taking good suction. Thereafter you try suction from Fwd. (P) bilge well for sometime after priming with Sea Water but there is no change in level. You inspect the suction filter of the pump and find that it is very difficult to remove the same, you had to apply too much of force to lift the filter cover while normally it comes out easily. What does it indicate?
A. It does not indicate anything, sometimes the filter covers are difficult to remove.
B. It indicates that the suction valve of the Fwd. Bilge Pump is leaking
C. It indicates that the suction filter of the Fwd. (P) bilge well is clogged completely
D. Pump suction filter might be clogged
After cleaning the sea chest filter you have placed the filter in the body and tightened the cover. Which one of the following is the best alternative?
A. You can open the filter inlet and outlet valves & directly start using the filter
B. If you do not want to use the sea chest in question, you need not worry and you can open the valves when required
C. Sea Water inlet valve should be crack opened, the filter body should be purged, any leakages and thereafter filter can be kept isolated or used as required
D. You will close the other side sea chest valves first and then open this side sea chest filter inlet and outlet valves
*Question 13
The suction pressure gauge of the Engine room bilge pump is broken and you don???t have a spare. Chief Engineer has asked you to troubleshoot the problem with Bilge pump not taking suction from Fwd.(P) bilge well. You try taking suction from Fwd. (S) & Aft Bilge well and find that pump is taking good suction. Thereafter you try suction from Fwd. (P) bilge well for sometime after priming with Sea Water but there is no change in level. You inspect the suction filter of the pump and find that it is very difficult to remove the same, you had to apply too much of force to lift the filter cover while normally it comes out easily. What does it indicate?
A. It does not indicate anything, sometimes the filter covers are difficult to remove.
B. It indicates that the suction valve of the Fwd. Bilge Pump is leaking
C. It indicates that the suction filter of the Fwd. (P) bilge well is clogged completely
D. Pump suction filter might be clogged
*Question 14
Process of enrichment of surface of steel and and steel alloys by zinc using Electroplating is known as
A. Cathodisation
B. Galvanisation
C. Neutralisation
D. Dezincification
Question 15
Which of the following statements is False about cleanliness of electric motors?
A. External motor body cleanliness of totally enclosed is important since the body helps to dissipate heat generated
B. Dirt, oil, grease and moisture are primary culprits in deterioration of insulation of stator windings of a motor.
C. High-pressure dry compressed air cleaning is preferred over suction cleaning for stator windings.
D. Dry compressed air at a high pressure can drive in dirt inside windings instead of removing them.
*Question 16
In a Parallel-Gate type valve the sealing between the valve and the disc is provided by:
A. Appropriate tightening torque of the valve spindle
B. Gate and valve seat have a taper and when tightened they will seal against each other
C. Either the seat or the disc Gate are free-floating, allowing upstream pressure to seal the seat and disc against any unwanted leakage
D. For a gate type valve the sealing is never perfect and they always allow some leakage
*Question 17
Which of the following instruments is used to measure rudder carrier bearing wear down?
A. Poker gauge
B. Telescopic feeler gauge
C. Depth gauge
D. Trammel
Which of the following statements is False about cleanliness of electric motors?
A. External motor body cleanliness of totally enclosed is important since the body helps to dissipate heat generated
B. Dirt, oil, grease and moisture are primary culprits in deterioration of insulation of stator windings of a motor.
C. High-pressure dry compressed air cleaning is preferred over suction cleaning for stator windings.
D. Dry compressed air at a high pressure can drive in dirt inside windings instead of removing them.
*Question 16
In a Parallel-Gate type valve the sealing between the valve and the disc is provided by:
A. Appropriate tightening torque of the valve spindle
B. Gate and valve seat have a taper and when tightened they will seal against each other
C. Either the seat or the disc Gate are free-floating, allowing upstream pressure to seal the seat and disc against any unwanted leakage
D. For a gate type valve the sealing is never perfect and they always allow some leakage
*Question 17
Which of the following instruments is used to measure rudder carrier bearing wear down?
A. Poker gauge
B. Telescopic feeler gauge
C. Depth gauge
D. Trammel
Question 18
A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing?
A. The seat fitted is slightly smaller than the outer dimensions of the ball, thus providing interference fit when closed
B. Either a floating seat is pressed onto trunnion supported ball by liquid pressure or floating ball is pressed onto the seat
C. Ball is not exactly spherical and is shaped such that during closure the surface coming into contact with seat is of slightly bigger diameter providing sealing
D. Seat is not exactly spherical, but slightly tapered so that during closure the ball sits tightly on the seat
Question 19
In case of tankers, the speed of cargo pumps is reduced while stripping, why?
A. To avoid cavitation of the pump as the NPSHa may fall below NPSHr if speed is not reduced
B. To avoid cavitation of pump as the NPSHa may rise above NPSHr if speed is not reduced
C. To prevent the pump from overspeeding if it loses suction
D. Decreasing the speed increases the discharge head of the pump which is required to pump out the remaining cargo
In case of tankers, the speed of cargo pumps is reduced while stripping, why?
A. To avoid cavitation of the pump as the NPSHa may fall below NPSHr if speed is not reduced
B. To avoid cavitation of pump as the NPSHa may rise above NPSHr if speed is not reduced
C. To prevent the pump from overspeeding if it loses suction
D. Decreasing the speed increases the discharge head of the pump which is required to pump out the remaining cargo
Question 22
Which of the following is an important requirement for proper functioning of sacrificial anode system :-
A. Good Insulation between anodes and ship???s hull
B. Good electrical continuity between anodes and ship???s hull
C. Providing protection of anodes from being painted over during hull painting
D. Presence of an insulating material between anode and the cathode
Which of the following is an important requirement for proper functioning of sacrificial anode system :-
A. Good Insulation between anodes and ship???s hull
B. Good electrical continuity between anodes and ship???s hull
C. Providing protection of anodes from being painted over during hull painting
D. Presence of an insulating material between anode and the cathode
Question 24 Time Remaining:
Normally so called ???single screw pumps??? are used as sludge pumps in engine room. What is the correct technical name of these pumps?
A. Snake Pump
B. Screw Pump
C. Progressive cavity pump
D. Gerotor Pump
Normally so called ???single screw pumps??? are used as sludge pumps in engine room. What is the correct technical name of these pumps?
A. Snake Pump
B. Screw Pump
C. Progressive cavity pump
D. Gerotor Pump
*Question 25 :
Sherardising , Chromising and Calorising fall under which of the processes of metal coating application :
A. Thermal spraying
B. Electroplating
C. Diffusion coating
D. Metal cladding
Question 26
In which of the following types of refractory failure, softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel?
A. Spalling
B. Cracking
C. Shrinkage cracking
D. Slagging
In which of the following types of refractory failure, softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel?
A. Spalling
B. Cracking
C. Shrinkage cracking
D. Slagging
Question 27
In a Sea Water cooled J.C.W. cooler, the most common cause for loss in cooling efficiency of the heater is:
A. Scale formation on J.C.W. side
B. Mud/silt deposits on J.C.W. side
C. Scale formation on S.W. side
D. None of the above
Question 29
When running TWO centrifugal Pumps in parallel, Flow rate"Q" is increased.
A. TRUE
B. False
C. May Be
D. I Don't know
When running TWO centrifugal Pumps in parallel, Flow rate"Q" is increased.
A. TRUE
B. False
C. May Be
D. I Don't know
Question 31
Cadmium coatings provide corrosion protection . Cadmium coatings are commercially carried out using which of the following methods :-
A. Metal Spraying
B. Electro-plating
C. Hot-dipping
D. Metal diffusion
Question 33
The machinery which is usually tested first once the ship reaches a dry dock is
A. Engine room crane
B. Engine room lift
C. Gantry crane for engine room
D. All of the above
Cadmium coatings provide corrosion protection . Cadmium coatings are commercially carried out using which of the following methods :-
A. Metal Spraying
B. Electro-plating
C. Hot-dipping
D. Metal diffusion
Question 33
The machinery which is usually tested first once the ship reaches a dry dock is
A. Engine room crane
B. Engine room lift
C. Gantry crane for engine room
D. All of the above
*Question 36
The function of an accumulator on the discharge side of a reciprocating bilge pump is to:
A. Supply liquid even when the pump is not running
B. Dampen out the pressure pulses and smoothen the flow
C. Increase the discharge pressure by storing liquid under pressure
D. No such device is required to
be fitted to modern bilge pumps
Question 37
A recently completely overhauled Engine room bilge pump was working efficiently.Suddenly one day you find that the pump is not taking suction. You have tried priming with sea but still the pump doesn???t take suction from any of the bilge wells or bilge tank. What could have gone wrong inside the pump? Choose the best alternative.
A. The bucket rings have worn out
B. The suction or discharge valve must have worn out and started leaking
C. The suction or discharge valve might be stuck in one position or some debris mighthave lodged itself in between the valve and the seat
D. Pump suction filter might be clogged
Question 37
A recently completely overhauled Engine room bilge pump was working efficiently.Suddenly one day you find that the pump is not taking suction. You have tried priming with sea but still the pump doesn???t take suction from any of the bilge wells or bilge tank. What could have gone wrong inside the pump? Choose the best alternative.
A. The bucket rings have worn out
B. The suction or discharge valve must have worn out and started leaking
C. The suction or discharge valve might be stuck in one position or some debris mighthave lodged itself in between the valve and the seat
D. Pump suction filter might be clogged
Question 38
It is given that engine room bilge pump has suction manifold on which 3 valves are located. One valve for the 3 engine room bilge wells suction, another one for Bilge tank suction and the third one is for sea water suction. It is found that the Bilge pump is unable to take suction from any of the bilge wells, but is able to take suction efficiently from Bilge tank. What is the most probable cause?
A. Pump suction filter cover gasket leaking
B. Suction filter cover gasket of one of the Bilge wells is leaking
C. Bilge well suction pipeline leaking between individual bilge well valves and suction manifold valve
D. Bilge pump suction pipeline leaking between the manifold and the pump
It is given that engine room bilge pump has suction manifold on which 3 valves are located. One valve for the 3 engine room bilge wells suction, another one for Bilge tank suction and the third one is for sea water suction. It is found that the Bilge pump is unable to take suction from any of the bilge wells, but is able to take suction efficiently from Bilge tank. What is the most probable cause?
A. Pump suction filter cover gasket leaking
B. Suction filter cover gasket of one of the Bilge wells is leaking
C. Bilge well suction pipeline leaking between individual bilge well valves and suction manifold valve
D. Bilge pump suction pipeline leaking between the manifold and the pump
Question 39
Pump driven clutch type attached vacuum pumps are commonly used for priming ballast pumps and emergency fire pump. What is the factor which de-clutches the vacuum pump from the pump clutch?
A. Low suction pressure acting against the spring loaded declutching piston
B. High suction pressure acting against the spring loaded declutching piston
C. Low discharge pressure acting against the spring loaded declutching piston
D. High discharge pressure acting against the spring loaded declutching piston
*Question 41
In shell and plate type coolers, due to improper flow design or partial blockage of tubes may lead to high turbulence locally. This condition may lead to (choose the best alternatives):
A. Bimetallic corrosion
B. Selective phase corrosion
C. Erosion
D. Impingement corrosion
*Question 42
You must have used reinforced rubber joints. The reinforcement is normally provided using non-asbestos fibres. The reinforcement is provided because (multiple choice)
A. Ordinary rubber gasket have a porous matrix, having capillaries which can allow liquid leakage when subjected to high pressure
B. To increase the load carrying capacity of joint so it can withstand higher pressures
C. To increase the temperature resistance of the joint
D. To protect the joints from fire or other accidental damage
*Question 43
The common term used for failure of metal and alloys in a corrosive environment , when subject to high stresses is known as :
A. Fatigue failure
B. Corrosion fatigue
C. Stress corrosion cracking
D. Fretting Corrosion
Question 44
Wheel operated butterfly valves are operated through a reduction gearbox. The Gear arrangement inside of gear box is of _________ type
A. Bevel Gear
B. Rack & Pinion Gear
C. Planetary Gear
D. Worm & Worm Wheel
*Question 45
Cladding is the process used for :-
A. Protection of metal surfaces against corrosion
B. Protection of metal surfaces against erosion
C. Protection of metal surfaces against cavitation erosion
D. Protection of metal surfaces impingement corrosion
Pump driven clutch type attached vacuum pumps are commonly used for priming ballast pumps and emergency fire pump. What is the factor which de-clutches the vacuum pump from the pump clutch?
A. Low suction pressure acting against the spring loaded declutching piston
B. High suction pressure acting against the spring loaded declutching piston
C. Low discharge pressure acting against the spring loaded declutching piston
D. High discharge pressure acting against the spring loaded declutching piston
*Question 41
In shell and plate type coolers, due to improper flow design or partial blockage of tubes may lead to high turbulence locally. This condition may lead to (choose the best alternatives):
A. Bimetallic corrosion
B. Selective phase corrosion
C. Erosion
D. Impingement corrosion
*Question 42
You must have used reinforced rubber joints. The reinforcement is normally provided using non-asbestos fibres. The reinforcement is provided because (multiple choice)
A. Ordinary rubber gasket have a porous matrix, having capillaries which can allow liquid leakage when subjected to high pressure
B. To increase the load carrying capacity of joint so it can withstand higher pressures
C. To increase the temperature resistance of the joint
D. To protect the joints from fire or other accidental damage
*Question 43
The common term used for failure of metal and alloys in a corrosive environment , when subject to high stresses is known as :
A. Fatigue failure
B. Corrosion fatigue
C. Stress corrosion cracking
D. Fretting Corrosion
Question 44
Wheel operated butterfly valves are operated through a reduction gearbox. The Gear arrangement inside of gear box is of _________ type
A. Bevel Gear
B. Rack & Pinion Gear
C. Planetary Gear
D. Worm & Worm Wheel
*Question 45
Cladding is the process used for :-
A. Protection of metal surfaces against corrosion
B. Protection of metal surfaces against erosion
C. Protection of metal surfaces against cavitation erosion
D. Protection of metal surfaces impingement corrosion
*Question 48
Which of the following is a correct point for sampling of system lube oil for on board or shore analysis?
A. Standpipes
B. Purifier outlets
C. Inlet or outlet of L. O. coolers
D. Tank drains
Question 49
Chromium is a nobler metal when compared to that of steel . In some marine applications Chromium is electroplated to the steel surfaces . Why?
A. Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protected
B. Chromium plating provides corrosion protection as well as high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces
C. Chromium plating is required for providing high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces and not for corrosion protection
D. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant
1. when A/E stand by F.O.heater in use of main engine
a. Sudden opening F.O. inlet valve pressurized and damage the heater
b. F.O. in vapour lock inside heater allow steam
c. F.O. inlet valve causes pressure drop M/E F.O. pressure standby water is not
Which of the following is a correct point for sampling of system lube oil for on board or shore analysis?
A. Standpipes
B. Purifier outlets
C. Inlet or outlet of L. O. coolers
D. Tank drains
Question 49
Chromium is a nobler metal when compared to that of steel . In some marine applications Chromium is electroplated to the steel surfaces . Why?
A. Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protected
B. Chromium plating provides corrosion protection as well as high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces
C. Chromium plating is required for providing high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces and not for corrosion protection
D. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant
1. when A/E stand by F.O.heater in use of main engine
a. Sudden opening F.O. inlet valve pressurized and damage the heater
b. F.O. in vapour lock inside heater allow steam
c. F.O. inlet valve causes pressure drop M/E F.O. pressure standby water is not
pressurized may cause sudden change in
engine /per load/rpm
d. heater leaking.
9 During prolonged astern manoeuvring of the relative expansion between any of the turbine its casing is likely to increase for an alarming level you should (multi choice) in photo no3 in download
A) Inform the bridge that no further manoeuvring is possible as the turbine are likely to be damaged
B) Reduce the vacuum further to control the relative expansion
C) Keep manoeuvring irrespective of damage to the turbines
D) Request the bridge to try to reduce number of astern movements
11 . How is manual desludging carried out if automatic fails in purifier? hat will be your first step of action?
d. heater leaking.
9 During prolonged astern manoeuvring of the relative expansion between any of the turbine its casing is likely to increase for an alarming level you should (multi choice) in photo no3 in download
A) Inform the bridge that no further manoeuvring is possible as the turbine are likely to be damaged
B) Reduce the vacuum further to control the relative expansion
C) Keep manoeuvring irrespective of damage to the turbines
D) Request the bridge to try to reduce number of astern movements
11 . How is manual desludging carried out if automatic fails in purifier? hat will be your first step of action?
E
pariksha class 4 (mep online 10)
Which one of the following is a type
of corrosion :-
A. Electroplating
B. Galvanisation
C. Graphitisation
D. Demulsification
A. Electroplating
B. Galvanisation
C. Graphitisation
D. Demulsification
A,B,D methods f basicaly used 2 ovrcome corrosion....bt C ia
actualy a type of corossion...
Which of the following types of damages are metal seatings of a valve subject to?Choose the correct alternative.
A. Corrosion, Erosion, Abrasion, Deformation
B. Corrosion, Fatigue failure, brittle fracture, caustic cracking
C. Erosion, caustic cracking, brittle fracture, Cloverleafing
D. None of the above
When centrifugal pump is used to pump a liquid of higher specific gravity the pump Power will
A. increase
B. decrease
C. Will not be affected as the pump power depends only on the flow capacity
D. None of the above
Aluminium being lower than zinc in Galvanic series provides lesser protection to steel compared to the zinc coating . Which one of the following is a true statement :
A. Aluminium coating provides good corrosion protection compared that of zinc at elevated temperatures
B. Zinc is always preferred over aluminium coating irrespective of the temperature of metal surface
C. Aluminium is never used as coating material
D. Aluminium reacts with steel , so cannot be used for coating steel
Mep online 11 questions
(Mep online 11)
1 Use of sinthetic polymer treatment
limited to low pressure boiler why
A-does not prevention of scale formation
B- does not help in corrosion prevention
C- does not form phosphate to tackle caustic
D- all of d above
2 What to check if Engine is not taking load.?
a. Water tightness to be checked.
b. Air to be removed from jacket water outlet line.
c. Priming lube oil pump to run before starting the engine.
d. Check the lube oil level.
e. Check the flow of lube oil.
f. Blow through the engine before starting.
all d above things shd b checked
3.How to change purifier to clarifier.?
ans:
Remove the gravity disc. Provide valve on water side and put a senser on clean oil side
6. Most steam traps respond well to cleaning. But when a thermodynamic trap fails to operate after cleaning, the next course of action should be:
A.Throttle the steam outlet valve
B. Renew the trap
C.Lap the disc and the seat of the trap
D. Throttle the steam inlet valve
8.Which of the following types of boiler burners have maximum turn down ratio?
A. Pressure jet type
B. Spinning cup burner
C.Spill type burner
D. Y-jet type burner
E pariksha class 4 (mep online 23)
A-does not prevention of scale formation
B- does not help in corrosion prevention
C- does not form phosphate to tackle caustic
D- all of d above
2 What to check if Engine is not taking load.?
a. Water tightness to be checked.
b. Air to be removed from jacket water outlet line.
c. Priming lube oil pump to run before starting the engine.
d. Check the lube oil level.
e. Check the flow of lube oil.
f. Blow through the engine before starting.
all d above things shd b checked
3.How to change purifier to clarifier.?
ans:
Remove the gravity disc. Provide valve on water side and put a senser on clean oil side
6. Most steam traps respond well to cleaning. But when a thermodynamic trap fails to operate after cleaning, the next course of action should be:
A.Throttle the steam outlet valve
B. Renew the trap
C.Lap the disc and the seat of the trap
D. Throttle the steam inlet valve
8.Which of the following types of boiler burners have maximum turn down ratio?
A. Pressure jet type
B. Spinning cup burner
C.Spill type burner
D. Y-jet type burner
E pariksha class 4 (mep online 23)
4. Resistance to corrosion of
Aluminium alloys is due to :
A. Aluminium being a very noble metal when compared to other metals in Electrochemical series
B. Formation of Aluminium oxide(Alumina) passive film on surface
C. The rate of corrosion is very low due to very high corrosion potential
D. All of the above.
5. For the S.W. side of a M/E L.O. cooler it is noticed that rise in S.W. temperature through the cooler has decreased from 12 deg. C to 7 deg. C over a period of time, while the drop in temperature of L.O. across the cooler has also decreased. All other coolers have been reported to be working normal & M/E is also running at a constant load in calm weather. What is the inference drawn by decrease in the temperature difference?
A. The cooling S.W. inlet temperature has reduced
B. The efficiency of the cooler has increased over a period of time
C. The cooler has become dirty on the S.W. side or L.O. side
D. S.W. side of the cooler may be partially blocked with mud and sea shells
6. Graphitisation is the term used to describe:
a) Bimetallic corrosion of brass and bronze alloys leading to deposition of graphite
b) Selective phase corrosion of grey cast iron leading to corrosion of graphite flakes and leading to loss of strength
c) Electroplating process in which graphite is deposited on the mild steel components to protect them against corrosion
d) Chemical reaction between pure graphite and iron so as to increase the graphite content of iron
A. Aluminium being a very noble metal when compared to other metals in Electrochemical series
B. Formation of Aluminium oxide(Alumina) passive film on surface
C. The rate of corrosion is very low due to very high corrosion potential
D. All of the above.
5. For the S.W. side of a M/E L.O. cooler it is noticed that rise in S.W. temperature through the cooler has decreased from 12 deg. C to 7 deg. C over a period of time, while the drop in temperature of L.O. across the cooler has also decreased. All other coolers have been reported to be working normal & M/E is also running at a constant load in calm weather. What is the inference drawn by decrease in the temperature difference?
A. The cooling S.W. inlet temperature has reduced
B. The efficiency of the cooler has increased over a period of time
C. The cooler has become dirty on the S.W. side or L.O. side
D. S.W. side of the cooler may be partially blocked with mud and sea shells
6. Graphitisation is the term used to describe:
a) Bimetallic corrosion of brass and bronze alloys leading to deposition of graphite
b) Selective phase corrosion of grey cast iron leading to corrosion of graphite flakes and leading to loss of strength
c) Electroplating process in which graphite is deposited on the mild steel components to protect them against corrosion
d) Chemical reaction between pure graphite and iron so as to increase the graphite content of iron
under
graphitisation, C I ,iron will be corroded leaving behind a soft graphite,will
loose iitz strength and it will crack
7. Accelerated corrosion due to removal of protective surface films (e.g.) oxide layers on metal/alloy surfaces due to turbulence of working fluid is known as
a) Bimetallic corrosion
b) Impingement corrosion
c) Cavitation erosion
d) Selective phase corrosion
What is bimetallic corrosion?
Bimetallic corrosion is the
accelerated corrosion of one metal placed in contact with a
different more noble (less
corroding) metal.
11. Which of the following is a true
statement (single choice)
A) Aluminium will be subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte.
b) Stainless steel will be subject to preferential corrosion when in electrical continuity with mild steel in presence of an electrolyte.
C) Copper will be subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte
d) Aluminium will be subject to preferential corrosion when in electrical continuity with zinc in presence of an electrolyte.
A) Aluminium will be subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte.
b) Stainless steel will be subject to preferential corrosion when in electrical continuity with mild steel in presence of an electrolyte.
C) Copper will be subject to preferential corrosion when in electrical continuity with stainless steel in presence of an electrolyte
d) Aluminium will be subject to preferential corrosion when in electrical continuity with zinc in presence of an electrolyte.
13. In refrigeration circuit, the data
logger will record what?(multi choice)
1. Room temperature
2. Recharge temperature
3. Liquid line temperature
4. Solenoid valve operation
1. Room temperature
2. Recharge temperature
3. Liquid line temperature
4. Solenoid valve operation
14. A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing?
A. The seat fitted is slightly smaller than the outer dimensions of the ball, thus providing interference fit when closed
B. Either a floating seat is pressed onto trunnion supported ball by liquid pressure or floating ball is pressed onto the seat
C. Ball is not exactly spherical and is shaped such that during closure the surface coming into contact with seat is of slightly bigger diameter providing sealing
D. Seat is not exactly spherical, but slightly tapered so that during closure the ball sits tightly on the seat
18. Cold and viscous lubricating oil
of an auxiliary engine is most likely to cause ___________
A) Sudden stopping of the engine
B) Difficulty in starting the engine
C) Rhythmic knocking sound from inside the engine
D) Drop in RPM of the engine
A) Sudden stopping of the engine
B) Difficulty in starting the engine
C) Rhythmic knocking sound from inside the engine
D) Drop in RPM of the engine
23. Air compressor cooler tube type
a) Spring type
b) Floating type
c) Fixed tube
d) U tube
a) Spring type
b) Floating type
c) Fixed tube
d) U tube
E pariksha class 4
(Mep online)
MEP-WRITTENS
*Question 14
Process of enrichment of surface of steel and and steel alloys by zinc using Electroplating is known as
A. Cathodisation
B. Galvanisation
C. Neutralisation
D. Dezincification
*Question 14
Process of enrichment of surface of steel and and steel alloys by zinc using Electroplating is known as
A. Cathodisation
B. Galvanisation
C. Neutralisation
D. Dezincification
Question 46 Time Remaining:
A sea chest filter has to be cleaned. Which one of the following best practice should be followed prior opening the filter?
A. Close inlet & outlet valves of the filter before opening the filter
B. Close inlet & outlet valves of the filter, then open the vent to release pressure before opening the filter
C. Close inlet & outlet valves of the filter before opening the filter
D. Put the other sea chest into use, isolate the filter by closing inlet & outlet valves, purge the filter body to depressurize it and then open up slowly
Question 50 Time Remaining:
Correct method of greasing a centrifugal pump bearing is:
A. To pump the grease until you feel high back pressure on the Grease pump
B. To pump the greasefor 3-4 pumping strokes of Grease pump for each bearing
C. To pump the grease when the pump is stopped and drain any old grease at the same time by opening the drain plug, giving only 3-4 pumping strokes on Grease pump for each bearing. the drain plug should then be replaced
D. To pump the grease when the pump is running and drain any old grease at the same time by opening the drain plug,until all the old grease is removed and new grease starts coming out of the drain, repeating samefor each bearing. the drain plug should then be replaced
-------------------------------------------------------------------------------------------------------------------------------------------
A sea chest filter has to be cleaned. Which one of the following best practice should be followed prior opening the filter?
A. Close inlet & outlet valves of the filter before opening the filter
B. Close inlet & outlet valves of the filter, then open the vent to release pressure before opening the filter
C. Close inlet & outlet valves of the filter before opening the filter
D. Put the other sea chest into use, isolate the filter by closing inlet & outlet valves, purge the filter body to depressurize it and then open up slowly
Question 50 Time Remaining:
Correct method of greasing a centrifugal pump bearing is:
A. To pump the grease until you feel high back pressure on the Grease pump
B. To pump the greasefor 3-4 pumping strokes of Grease pump for each bearing
C. To pump the grease when the pump is stopped and drain any old grease at the same time by opening the drain plug, giving only 3-4 pumping strokes on Grease pump for each bearing. the drain plug should then be replaced
D. To pump the grease when the pump is running and drain any old grease at the same time by opening the drain plug,until all the old grease is removed and new grease starts coming out of the drain, repeating samefor each bearing. the drain plug should then be replaced
-------------------------------------------------------------------------------------------------------------------------------------------
E pariksha class 4
(mep)
18. Corrosion of mild steel can b effectively prevented by
A) Cathodic protection
B) Protective coatings
C) Addition of suitable alloying elements
18. Corrosion of mild steel can b effectively prevented by
A) Cathodic protection
B) Protective coatings
C) Addition of suitable alloying elements
8) WHICH PROCESS IS NOT DONE ON MILD
STEEL ..???? options were hot plating, electrolysis, explosion
bonding, metal spraying
what is the correct procedure in
tightening a torque spanner:
a. tightening beyond the cracking sound
b.by using a addition length rod
c.fluctuating load
d. none of the above
a. tightening beyond the cracking sound
b.by using a addition length rod
c.fluctuating load
d. none of the above
The delivery rate of an axial piston
hydraulic pump is controlled by varying the position of the _____________.
tilting box
slide block
pintle
reaction ring
Ans: Tilting Box
tilting box
slide block
pintle
reaction ring
Ans: Tilting Box
Use of sinthetic polymer treatment
limited to low pressure boiler why
A-does not prevention of scale formation
B- does not help in corrosion prevention
C- does not form phosphate to tackle caustic
D- all of d above
A-does not prevention of scale formation
B- does not help in corrosion prevention
C- does not form phosphate to tackle caustic
D- all of d above
The diameter of the branch suction
pipe referred to in item 118 shall not be less than that derived in accordance
with the following formula, taken to the nearest 5 mm:
Lowercase d equals 25 millimeters plus 2.16 times the square root of the product of C times the sum of B and uppercase D
where:
Lowercase d equals 25 millimeters plus 2.16 times the square root of the product of C times the sum of B and uppercase D
where:
d - is the
internal diameter of the branch suction pipe, in millimetres
C - is the length of the cargo hold, in metres
B - is the greatest moulded breadth of the ship in metres
D - is the moulded depth of the ship to freeboard deck, in metres
C - is the length of the cargo hold, in metres
B - is the greatest moulded breadth of the ship in metres
D - is the moulded depth of the ship to freeboard deck, in metres
d=2.16*sq
root[C(B+D)] +25 mm
Resistance to corrosion of Aluminium
alloys is due to :
A. Aluminium being a very noble metal when compared to other metals in Electrochemical series
B. Formation of Aluminium oxide(Alumina) passive film on surface
C. The rate of corrosion is very low due to very high corrosion potential
D. All of the above.
A. Aluminium being a very noble metal when compared to other metals in Electrochemical series
B. Formation of Aluminium oxide(Alumina) passive film on surface
C. The rate of corrosion is very low due to very high corrosion potential
D. All of the above.
According
to the US Army Corps of Engineers, “Aluminum has
excellent corrosion resistance in a wide range of water and
soil conditions because of the tough oxide film that forms
on its surface. Although aluminum is an active metal in the
galvanic series, this film affords excellent protection
excellent corrosion resistance in a wide range of water and
soil conditions because of the tough oxide film that forms
on its surface. Although aluminum is an active metal in the
galvanic series, this film affords excellent protection
Which of the foll. is a true
statement
A) Aluminium wl b subject to preferential corrosion when in electrical
continuity with stainless steel in presence of an electrolyte.
b) Stainless steel wl b subject to preferential corrosion when in electrical
continuity with mild steel in presence of an electrolyte.
A) Aluminium wl b subject to preferential corrosion when in electrical
continuity with stainless steel in presence of an electrolyte.
b) Stainless steel wl b subject to preferential corrosion when in electrical
continuity with mild steel in presence of an electrolyte.
C) Copper wl b subject to
preferential corrosion when in electrical
continuity with stainlesssteel in presence of an electrolyte
d) Aluminium wl b subject to preferential corrosion when in electrical continuity
with zinc in presence of an electrolyte.
continuity with stainlesssteel in presence of an electrolyte
d) Aluminium wl b subject to preferential corrosion when in electrical continuity
with zinc in presence of an electrolyte.
The
galvanic series determines the nobility f metals and semi-metals. When two
metals are submerged in an electrolyte, while electrically connected, the less
noble (base) will experience galvanic corrosion. Galvanic series s as follows –
Graphite, Au, Ag, Titanium, Ni, Cu, Tin, Pb, Stainless steel, Cast iron, Mild
steel, Al, Zn, Mg(least noble). Aluminium will corrode faster than stainless
steel
GME 15 (37
members)
•
Graphitisation is the term used to describe:
•
Bimetallic corrosion of brass and bronze alloys leading to
deposition of graphite
•
Selective phase corrosion of grey cast
iron leading to corrosion of graphite flakes and leading to loss of strength
•
Electroplating process in which graphite is deposited on the
mild steel components to protect them against corrosion
•
Chemical reaction between pure graphite and iron so as to
increase the graphite content of iron
FINISHED
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You have
seen and operated several valves onboard ships. All the butterfly valve
operation handles are operated by a locking arrangement because:
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Which of the group of method are used for priming of centrifugal
pumps onboard ships?
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The size of solid particle contaminants in hydraulic systems is
measured in:
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Which of the following instruments measures propeller drop?
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Which of the following can be done to reduce the cold corrosion of
Main Engine cylinder liners using high sulphur fuel oil :-
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Your ship has a OWS and reciprocating bilge pump of capacity 2.0 m3
/hr. It takes about 12 hours to pump out the complete bilge tank through OWS.
The ship is going to dry-dock and Chief Engineer is recommending company to
install a centrifugal pump of 10 m3 capacity which will take the same space
and can pump out the bilge tank only in 2.5 hrs. The company should:
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The crank web deflection readings of a diesel engine would be
erroneous in which of the following conditions?
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Which of the following is an important requirement for proper
functioning of sacrificial anode system :-
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Which of the following types of damages are metal seatings of a
valve subject to?Choose the correct alternative.
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You are pumping out sludge to a shore facility using your sludge
pump. You find that the discharge rate of pump is very slow and suction
filter is getting clogged frequently.What is the best alternative to
counteract the problem?
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The process of depositing zinc on steel surfaces
by diffusion coating is known as :
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By which of the following is the attached vacuum pump of a ballast
pump is driven?
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A drain cooler is provided with S.W. cooling. What
is the best way to increase the temperature of condensate draining to the
hotwell?
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You must have used reinforced rubber joints. The reinforcement is
normally provided using non-asbestos fibres. The reinforcement is provided
because
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Corrosion protection of steel surfaces by zinc
coating can be carried out only at temperatures below 65 Deg. C . For higher
temperatures :
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Bronze is an alloy typically consisting of :-
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The process of depositing chromium on to steel surfaces by diffusion
coating is known as :
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A refrigerant compressor will run continuously when there is
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You have overhauled a centrifugal pump and while
assembling forgot to install the o-ring between the sleeve (provided in way
of gland packing) and the shaft. What impact does this have?
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Which of the following types of boiler burners have maximum turn
down ratio?
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Copper tubing is used in Refrigerant system because
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Which of the following is a true statement ? (choose more than one
option if true)
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F.O. transfer pump was working efficiently, but it
stopped taking suction suddenly. There is a sounding of 6.0 m in the F.O.
deep tank. The suction pressure gauge was renewed recently and is showing a
positive pressure whenpump is running,
but Pump is not transferring any F.O. What is the
most probable cause?
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Motor stator winding badly contaminated by dirt, oil and grease
should be cleaned by:
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Aluminium being lower than zinc in Galvanic series provides lesser
protection to steel compared to the zinc coating . Which one of the following
is a true statement :
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Which of the following statements is False about hydraulic
jacks/tensioning tools?
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Which of the following can lead to premature failure of roller
bearings?
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Freight paid by charterers on a
quantity of cargo short-shipped, i.e quantity agreed upon but not loaded by the
charterer, is called:
A. Pro-rata freight
B. Back Freight
A. Pro-rata freight
B. Back Freight
...
C. Dead freight
D. None of the above
C. Dead freight
D. None of the above
Screw pump is generally are
??????????????? pump
A. Slow speed
B. High speed
A. Slow speed
B. High speed
C. Medium speed
D. All of the above
5. You as a fourth engineer have
taken over watch from third engineer. He said OWS is running in 0 ppm. But
after taking over watch you observed that fresh water flushing valve is crack
open. After closing it, suddenly the oil content has exceeded 15ppm. What will
you do?
a. shut the OWS & inform CEO.
b. shut the OWS but no need to inform anyone.
c. Don't touch the appratus & inform CEO.
d. Just check that there is no visible colour/oil traces in sea water so don't have to inform anyone.
a. shut the OWS & inform CEO.
b. shut the OWS but no need to inform anyone.
c. Don't touch the appratus & inform CEO.
d. Just check that there is no visible colour/oil traces in sea water so don't have to inform anyone.
Which of the following will be
required to be done in order to reduce sulphur corrosion of Main
Engine components
A. Increasing the atomization pressure of fuel injectors
Engine components
A. Increasing the atomization pressure of fuel injectors
B. Fitting exhaust valves with valve
rotators
C. Running engine at or near normal sea load
D. Decreasing the F.O. purifier feed rate , running two purifier in series one acting as purifier and
other as calrifier
C. Running engine at or near normal sea load
D. Decreasing the F.O. purifier feed rate , running two purifier in series one acting as purifier and
other as calrifier
Centrifugal pumps cannot handle air
and require priming.But you are aware that centrifugal which
on the same principal can handle air very well. Which two properties of air are responsible because
of which the centrifugal pumps cannot handle air:-
A. Fluidity only
on the same principal can handle air very well. Which two properties of air are responsible because
of which the centrifugal pumps cannot handle air:-
A. Fluidity only
B. Density only
C. Both fluidity and density
D. Compressibility
Question 49 Time Remaining:
Chromium is a nobler metal when compared to that of steel . In some marine applications Chromium is electroplated to the steel surfaces . Why?
A. Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protected
B. Chromium plating provides corrosion protection as well as high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces
Chromium is a nobler metal when compared to that of steel . In some marine applications Chromium is electroplated to the steel surfaces . Why?
A. Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protected
B. Chromium plating provides corrosion protection as well as high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces
C. Chromium plating is required for
providing high glossiness and high hardness for better wear resistance and
reduced friction to the steel surfaces and not for corrosion protection
D. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant
D. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant
. You as a fourth engineer have
taken over watch from third engineer. He said OWS is running in 0 ppm. But
after taking over watch you observed that fresh water flushing valve is crack
open. After closing it, suddenly the oil content has exceeded 15ppm. What will
you do?
a. shut the OWS & inform CEO.
b. shut the OWS but no need to inform anyone.
c. Don't touch the appratus & inform CEO.
d. Just check that there is no visible colour/oil traces in sea water so don't have to inform anyone.
a. shut the OWS & inform CEO.
b. shut the OWS but no need to inform anyone.
c. Don't touch the appratus & inform CEO.
d. Just check that there is no visible colour/oil traces in sea water so don't have to inform anyone.
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