December2012
online question
1.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
2.If 3 Centrifugal pumps are running in
parallel and the backpressure is substantially increased, what effect will be
observed on the pumps in use.
A. Flow rate will reduce.
B. Increase in the pump casing
temperature.
C. Safety alarms and trips
(high casing Temperature) will activate, if no corrective action taken
D. None of the above.
E. All of the above.
3.Which of the following is a true statement
? (choose more than one option if true) multiple choice
A. Mild steel 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 Mild steel in
presence of an electrolyte
D. Zinc will be subject to
preferential corrosion when in electrical continuity with Aluminium in presence
of an electrolyte
4.The steels with a carbon percentage close
to 0.8% have
A. poor strength but good
weldability
B. High strength but poor
weldability
C. Poor strength and poor
weldablity
D. High strength and good
weldability
5.The lower half of main bearing of a very
large diesel engine can be removed by:
A. Pulling out with a chain
block
B. By hammering out with the
help of a soft mallet
C. By slightly jacking the
crankshaft and turning out the bearing half with a rope or similar tackle
provided.
D. By using a special tool in
the oil hole and turning the shaft to turn out the lower half.
6.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
Mark: 2
7.The gland packing on centrifugal pump shaft
should:
A. Not allow any leakage under
positive suction pressure
B. Should only allow drop by
drop continuous leakage under positive suction pressure
C. Should only allow drop by
drop continual leakage under positive suction pressure
D. Should allow considerable
leakage as gland packings are meant to allow considerable leakage
Mark:
2
8.Which of the following cannot be used as
sacrificial anode for the protection of Mild steel structure against corrosion
:
A. Cadmium
B. Magnesium
C. Copper
D. Aluminium
9.Excessive lubrication in compressors can
lead to: multiple
A. Sticking of valves
B. Carryover and deposit of
oil particles in pipelines and reservoirs
C. Decompression
D. Detonation
10.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
11.The pumps performance depends upon
A. Clearance between the wear
ring and the impeller
B. Clearance between the
impeller and the casing
C. Clearance between impeller
and shaft
D. Clearance between
mechanical seal and shaft
12.The type of corrosion normally occurring
in cooling Fresh Water systems of Marine Diesel Engines is :
A. Stress corrosion
B. Hot corrosion
C. Bimetallic corrosion
D. Selective Phase corrosion
13.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
14.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
15.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
16 When centrifugal pump is changed over for
pumping a liquid of higher specific gravity which of the following is going to
change?
A. Discharge pressure
B. Discharge head
C. Power consumption
D. Pump speed
17. Auxiliary engine connecting rod bottom
end bolts should be tightened:
A. Only as per the prescribed
torque using a torque range
B. As per prescribed torque as
well as angular measurements as recommended by the manufacturer.
C. By
following previous match marks on bolt heads and connecting rod body
D. As per prescribed torque
and another 10% increase during every subsequent tightening. \
Mark: 2
18.Why are large centrifugal pumps started
with their discharge valves closed?
A. To ensure proper priming
B. To limit sudden rise in
discharge rate
C. To limit motor starting
current
D. To minimize starting torque
on motor shaft
19.Which of the following statements are true
as far as painting of steel hull/structure is concerned? Multiple choice
A. Painting can be done under
any weather condition
B. Painting can only be done
after proper surface preparation is carried out
C. Painting should only be
done on top of appropriate primer coating
D. Several coats of paint can
be applied one after the other without any time gap
20.When one of the M/E F.O. heater is not in use, then:
A. The F.O. inlet & outlet
valves should be kept shut, but steam heating valves should be kept crack open,
so as to keep the heater warm
B. F.O. inlet & Outlet
valves should be kept shut, steam heating valves also should be completely shut
and heater should be drained of any remaining F.O.
C. F.O. inlet and outlet
valves should be kept crack open so that the F.O. recirculation through the heater
can take place
D. F.O. inlet valve should be
kept shut while the outlet valve should be left open, so that heater can be put
into use as fast as possible in case required
21. Which of the following can lead to sudden
stopping of a diesel engine?
A. Air in fuel supply line
B. Water in fuel supply line
C. Obstruction in air filter
D. Water in the air filter
22. A multistage centrifugal pump is normally
used
A. High head
B. High discharge flow
C. High viscous fluids
D. Low viscous fluid
23. In a three phase electrical equipment,
the immediate action in the event of a fuse blowing in one of the phases, would
be:
A. To replace with a fuse of
correct rating
B. To replace fuses on all
three phases
C. To try to repair the fuse
D. To investigate the fault
that led to the blowing of the fuse '/
24. 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
25. 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;
26. During auxiliary engine de-carbonization,
which of the following checks need to be carried out?
A. Sounding of all double
bottom tanks
B. Connecting rod big end
ovality
C. Liner wear
D. Crack detection tests on
connecting rod serrations
27.A reciprocating pump is used for Engine
room bilge service because:
A. Reciprocating pumps are
designed for smoother discharge
B. Only small capacity pumping
capacity is required, while other pumps are of higher capacity
C. It doesn???t churn and mix
the bilge water unlike other types of rotary and rotodynamicpumps
D. Shipbuilding industry is
still going on old concept, future ships will have centrifugal pumps installed
28.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
29.While re-floating the vessel after dry
dock, which of the following checks should be carried out?multichoice
A. Sounding of all double
bottom tanks
B. Checking leakages in the
stern tube header tanks
C. Checking leakages at ship
side valves
D. Checking levels of stern
tube header tanks
30. 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
31.the size of solid particle contaminants in
hydraulic systems is measured in:
A. Millimeter cubed
B. Nano-millimeter
C. Microns
D. Micro millimeter
32.In a reciprocating pump the direction of
flow depends upon:
A. Direction of rotation of
the pump
B. Position & fixing of
suction and discharge valves
C. High pressure to low
pressure
D. Whether pump is single
acting or double acting
Mark:
2
33.Fire side in boilers gets commonly
corroded due to :
A. Galvanic action
B. Formation of Vanadium
pentaoxide and sulphuric acid
C. Stress corrosion
D. Crevice corrosion
34.Pump driven clutch type attached vacuum
pumps are commonly used for priming ballast pumps and emergency fire pumps.
What is the factor which clutches the vacuum pump clutch to the pump clutch
during start of the pump?
A. Low suction pressure acting
against the spring loaded clutching piston
B. High suction pressure
acting 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
35.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.
36.In a shell and type M/E L.O. cooler, the
temperature of L.O. is controlled by an automatic temperature control valve.
Out at sea with M/E running at sea load it is observed that the temperature
control valve opening to the cooler is increasing day by until it becomes 100%
open to the cooler. The L.O. outlet temperature _______________ after the above
condition has reached
A. Starts decreasing
immediately
B. Starts increasing
immediately
C. Will be maintained at the
set point of the temperature controller
D. Cannot be maintained at the
set point and will increase slowly
37.Which of the following is NOT a rotary
motion valve?
A. Gate valve
B. Butterfly Valve
C. Ball valve
D. Plug Valve
38.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
39.During shutting down the purifier you find
that purifier always vibrates heavily for some time and then becomes normal
until it finally comes to a stop. What is wrong with purifier?
A. The purifier design is
faulty
B. The purifier bowl has a
heavy sludge deposit and requires cleaning
C. The purifier bowl is not
balanced properly
D. During shutting down most
of the purifiers pass through the critical speed zone
Mark: 2
40.Hot corrosion in exhaust valves and fire
side of boiler mainly when :
A. Fuels containing vanadium
content with high sodium content are used
B. Fuels containing vanadium
content with low sodium content are used
C. Fuels containing high
vanadium and high sulphur content are used
D. Fuels containing high
sulphur content is used and the exhaust temperatures are uncontrolled and
exceed 600 deg. C
41.NPSH and the Total suction head are two
terms which are commonly used for pumps. Which of the following is a true
statement?
A. They are one and the same
thing
B. Total suction head is
greater than NPSH
C. NPSH is always greater than
Total suction head
D. Total suction head and NPSH
have no relationship
42.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
43.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?
A. It will not affect the pump
in any way
B. It will cause leakage of
fluid(air/water) in between the shaft and the sleeve and will affect the pump
performance
C. It will not affect the pump
performance n any way but will corrode the shaft between the o-ring and shaft
D. It will cause dynamic
imbalance of the shaft
44.You must have used reinforced rubber
joints. The reinforcement is normally provided using non-asbestos fibres. The
reinforcement is provided because
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
45.Metal
cladding provides protection to the metal essentially for the life of ship
because
A. During
cladding the protective coating reacts chemically with the base metal and
inhibits corrosion
B. This
is the only method in which the completeness of the metal coating can assured,
while other methods are liable to defects
C. The
thickness of protective coating is greater compared to any other metal coating
method used
D. The
adherence of coating is best in case of metal cladding
46.Which of the following can cause exhaust
with black smoke in a diesel engine?multi choice
A. Choked air filter of
turbocharger
B. Water mixed with fuel
C. Bad atomization of fuel
D. Overload
47.Net Positive Suction Head is the
A. Difference of Total suction
head and Total discharge head
B. Difference of static head
and the frictional head
C. Difference of dynamic
suction head and the vapour pressure of liquid
D. Difference of Static
suction head and the vapour pressure of liquid
48.the purpose of the wearing rings used in a
centrifugal pump is to
A. Prevent internal explosion
in the pump when it is overheated
B. Enable a visual inspection
of the pump when it is running
C. Ensure a proper alignment
of the pump coupling to the driver
D. To isolate suction and
discharge side
49.The
automatic/manual recirculation valve provided on the S.W. overboard line is
provided so that:
A. S.W. temperature can be
regulated and coolers can maintain correct temperatures even with low
S.W.temperatures
B. S.W. temperature can be
regulated and coolers can maintain correct temperatures even with high
S.W.temperatures
C. S.W. can be re-circulated
when outside water is extremely muddy
D. S.W. can be re-circulated
to conserve when sea chest suction filters become very dirty
50.Before putting into operation a coalescer
type Oily Water Separator, it is important to:
A. Fill it up with purge water
B. Drain it completely
C. Switch off the heater
D. Keep the three way valve
manually open
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