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Thursday 5 September 2013

Motor collections part 6


1.       Which is true?
a.       Rotary vane steering gear generally operates at high oil pressure than RAM type
b.       RT > RV
c.        RT=RV
d.       None of the above
2.       Which part of the liner wear due to catalytic fines in fuel
a.       Upper part
3.       Besides raising the liner wall temperature to sulphur corrosion
a.       Increase cylinder feed
b.       Increase scavenge air temperature
c.        Improved separation of water 
d.       All the above
4.       Functions of attemprator
a.       Increase boiler feed water temperature
b.       Decrease super heated steam out temp and protect secondary stage superheat
c.        Control super heat steam out temp and protect secondary stage superheat
d.       Increase the combustion air temperature
5.       Resin chokes
a.       Better vibration damping
b.       Better compressive strength
c.        Unaffected by fuel oil and sea water chemicals
d.       None of the above.
6.       Exhaust grouping in main engine
a.       Better starting
b.       No need for auxiliary blowers
c.        Pure prime
7.       No change in speed in governor
a.       Fine
b.       Coarse
c.         Isochronous
d.       Unichronous
        8. Crank case ventilation for function as
a. Prevent acc. Of combustion gases
b. Temp. links oil loading
 9. In a fully built or semi built type crankshaft, how can any slippage at shrink fit be identified?
A. By inspecting the locking arrangement provided
B. By checking the dowel provided.
C. By checking the witness mark provided for reference .
D. By checking the performance of the engine 
10. 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
11. The use of ball and roller bearings in internal combustion engines is becoming more and more popular for some or all of the following
        (a) The low coefficient of friction
         (b) The absence of wear under favorable conditions
          (c) The independence in lubrication
         (d) The extreme reliability of such bearings
12. 2 stroke exhaust valve rotates by
                a. rotocap
                b. vanes
13.Sulphur and vanadium in F.O
A.Hot corrosion
B.Cold corrosion
C.Caustic corrosion
D.Acidic corrosion
14.Cyl liner material
A.Cast iron
B.cast steel
15. As per regulations, the velocity capacity of a steering gear system should be such so as to be able to turn the rudder__________________________
A. 35 degrees one side to 35 degrees on the other side, in 28 seconds at maximum service speed
B. 35 degrees one side to 30 degrees on the other side in 28 seconds at maximum service speed
C. 35 degrees one side to 35 degrees on the other side, in 28 seconds at normal service speed
D. 35 degrees one side to 30 degrees on the other side, in 28 seconds at normal service speed
16. Governor paralleling for generators requires
A.Fine droop/some droop
B.No droop
C.course droop
17.In diesel generator, increasing the fuel due to drop in load , which will --------------------save machine from damage
A.Limiting load switch
B.Limiting shredded switch
C.Limiting <<>> sensor
D.Limiting <<>>
18.In 2s,getting normal combustion pr. But reduced in max pr. Due to
A.faulty fuel injection timing
B.exh. valve leaking
C.Piston rings faulty
19.TBN value of cyl oil is too high to sulphur content in fuel oil
A.Alkalinity corrosion
B.Not a problem
20. Efficiency of constant pressure T/C is _______ than pulse type T/K
A.less
B.Equal
C.slightly more
D.Very high
21.Thrust block bearings
A.Tilted <<>>
B.Flat pad
C.Roller
D.Ball bearing
23.Shims are added to the fuel pump
A.retarding injection
B.Advancing injection
25.Use of economizer
A.to reduce exh. Gas temp. so that NOx will reduce
B.To reduce Sox
C.To increase the efficiency of propulsion unit
 26. 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.
1.       Temperature at which hazing of oil is called
                                                               i.      Haze point
                                                              ii.      Cloud point
                                                            iii.      Floc point
2.       Operating pressure of which type is greater?
                                                               i.      Ram type
                                                              ii.      Rotary vane
                                                            iii.      Both are almost same
                                                            iv.      None of them
3.       Which steering gear type is electro hydraulic?
                                                               i.      Ram type
                                                              ii.      Rotary type
                                                            iii.      Both
                                                            iv.      None
4.       Sealing arrangement of T/C of Main engine.
                                                               i.      Compressed air with 30 bar
                                                              ii.      Control air
                                                            iii.      Air comes directly from compressor of T/C.
5.       when cross head bearing of a large 2 stroke marine engine on a cargo ship is opened up for survey is mandatory for the cross head to be inspected by the
                                                               i.      port state inspector
                                                              ii.      cargo gear surveyor
                                                            iii.      ISM auditor
                                                            iv.      Attending workshop superintendant  
6.       The temperature, at which a fuel will start to burn under given conditions, is called its, ignition temperature. This temperature varies greatly with
(a) Composition of the air-fuel mixture.
(b) Amount of excess air.
(c) Size, shape and temperature of the compression space.
(d) All the above
7.       VESSEL IS AT DRYDOCK , WHO ISSUE HOT WORK PERMIT…???
                                                        I.            Options were CE
                                                      II.            2E
                                                   III.             shipyard engineer
                                                    IV.            Ship superintendant.
8. Following method is sometimes used in constant pressure turbochargers of a 4-stroke diesel alternators during starting and rapid acceleration:
A. Auxiliary electrical blowers assisting turbochargers during starting
B. Auxiliary shaft driven blowers assisting turbochargers during starting
C. Auxiliary air drive for turbocharger acceleration during starting
D. Variable geometry turbocharging
9. Automatic combustion control systems for some auxiliary boilers are designed to cycle burners on in response to
I.             A. low fuel pressure
II.            B. fuel return pressure
III.          C. low steam pressure
IV.          D. furnace air pressure
10. A normal manometer reading of turbocharger air suction filter and normal speed of the turbocharger but reduced scavenge air pressure may be due to:
A. Fouling of the nozzle ring
B. Fouling of diffuser or compressor wheel
C. Fouling of the turbine
D. Cold climate

11. Abnormal wear occurring in engines due to localized welding and fracture is known as
A. Scoring
B. Scuffing
C. Peeling
D. None of the above
12. The bearings used to support the crankshaft are generally called
A. line shaft bearings
B. connecting rod bearings
C. main bearings
D. support bearings
13.Which of the following statements is true?
A. A fuel with high cetane index has longer ignition lag and is associated with better combustion.
B. A fuel with high cetane index has shorter ignition lag and is associated with better combustion.
C. A fuel with low cetane index has longer ignition lag and is associated with better combustion.
D. A fuel with low cetane index has shorter ignition lag and is associated with better combustion
14.The flame safeguard control system of a large automatic auxiliary boiler will provide fuel shut off in the case of high
A. water
B. voltage
C. fuel pressure
D. steam pressure
15. What prevents rotation and fretting between a thin shell bearing and its housing ?
A. Location tangs or pegs
B. The nip or crush of the bearing
C. A special kind of adhesive
D. Any of the above
16.Which of the following can be a consequence of worn scraper rings and sealing rings of a piston rod stuffing box?
A. Increased risk of scavenge fire
B. Increased risk of crankcase explosion
C. Increased Lube oil consumption
D. All of the above
17. Which of the following types of crankshafts is much lighter at similar power requirements?
A. Fully built type
B. Semi built, all welded type
C. Semi built type
D. Solid forged type
18. Which of the following types of scavenging systems is most popular in modern engines?
A. Loop scavenging
B. Cross flow scavenging
C. Uniflow scavenging
D. Reverse scavenging
19. Steam temperature control for the ESD boiler is achieved by :
A. Fitting a de-superheater between 1st & 2nd passes of superheater
B. Fitting an attemperator between 1st & 2nd passes of superheater
C. Bypassing the superheater
D. Gas dampers in boiler uptake
20. Which of the following statements is true?
A. The TBN value of cylinder oil should be ideally matched with the sulfur content of the fuel.
B. The TBN value of cylinder oil is not a function of the sulfur content of fuel oil.
C. Cylinder oils with higher TBN values should be used for fuel oils with lower sulfur content.
D. The TBN value of cylinder oil is a function of maximum combustion pressure.
21. The super long stroke slow speed 2-stroke diesel engines when compared to short stroke version gives:
A. Poorer propulsive efficiency but better fuel combustion
B. Better propulsive efficiency but poorer fuel combustion
C. Better propulsive efficiency as well as better fuel combustion
D. Poorer propulsive efficiency as well as poorer fuel combustion
22. Coked material remaining after an oil has been exposed to high temperature, is an indication of the coke forming tendency of the oil. It can be expressed as
A. Conradson
B. Ramsbottom
C. Micro Carbon Residue(MCR)
D. Any of the above
23. The purpose of valve spindle rotators in case of exhaust valves of modern two stroke engines is to:
A. Improve engine efficiency by allowing even temperature distribution through the combustion chamber
B. Allow even temperature distribution along the disc of the valve spindle, even wear rate and removal of any deposits
C. Utilising waste energy in the exhaust gases to increase the engine efficiency
D. Allow exhaust gases to exit in a rotational motion, inducing good draught of scavenge air for better mixing of air and fuel for effective combustion
24.In modern 2-stroke marine diesel engines the exhaust valves are:
A. Mechanically actuated
B. Pneumatically actuated
C. Hydraulically actuated
D. Electrically actuated
25.Which of the following is a proper practice to follow in the event of discovery of a small soot fire in exhaust gas boilers?
A. Repeated soot blowing
B. Stopping cooling water circulation
C. Reducing main engine speed
D. Opening the inspection doors and extinguishing the fire
26. An additive added to a lubricant to keep engine parts clean is known as ______________
A. Dispersant
B. Detergent
C. Cleaning agent
D. None of the above
27. The scavenge ports of a uniflow scavenged 2-stroke engine cylinder liner are machined at an oblique angle to the axis of the cylinder, why ?
A. To prevent exhaust gases from coming out of scavenge ports
B. To allow rotary motion to scavenge air to reduce exhaust gas temperature for reduced NOx emission
C. To allow rotary motion to scavenge air for better scavenging and better air-fuel mixing
D. To allow rotary motion to scavenge air for better cylinder oil distribution on the liner walls and better turbocharger performance
28. Both power units of a steering gear system need to be switched on ______________
A. When the ship is within 12 nautical miles from shore.
B. When pilot is on board
C. When navigational circumstances demand caution
D. ALL
29. The kinetic energy imparted to air by the compressor impeller of a turbocharger is converted into pressure energy at the:
A. Nozzle ring
B. Diffuser ring
C. Inducer ring
D. None of the above
30. Which of the following is one of the disadvantages of cast iron chokes, used in holding down arrangement of engines?
A. Poor compressive strength
B. Poor vibration damping
C. Cast iron is brittle and prone to crack
D. All of the above
31.Economisers are built up with
A. Copper tubes
B. Plain steel tubes
C. Stainless steel tubes
D. Steel tubes fitted with shrunk on C.I. grills
32. Which of the following is the primary advantage of supercharging the air quantity in a diesel engine, by means of a turbocharger?
A. It leads to considerable gain in thermal efficiency.
B. It increases the maximum pressure generated in a cylinder appreciably.
C. It improves the power to weight ratio of the engine
D. All of the above.
33. Only a pre determined fixed amount of water should be used during:
A. Water washing of the turbine side of a turbocharger
B. Water washing of the blower side of a turbocharger
C. Water washing of both blower and turbine sides of a turbocharger.
D. Exhaust gas boiler water washing.
34. A non water-cooled turbocharger offers which of the following advantages?
A. More heat is available for waste heat boilers
B. Corrosion problems of internal surfaces due to formation of sulfuric acid are eliminated
C. Improved thermal efficiency of turbocharger
D. All of the above.
35. Too high Calculated Carbon Aromaticity index (CCAI) of fuel oil indicates:
A. Reduced ignition delay
B. Increased ignition delay
C. Reduced chances of knocking
D. None
36. 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
37. Which of the following is a corrosive type of wear of a cylinder liner?
A. Scuffing
B. Scoring
C. Clover- leafing
D. None of the above

38. 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
39. 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
40. The maximum pressure a centrifugal pump can generate is called:
A. Shutoff head
B. Total dynamic head
C. Total head
41. what type of tanks in pressurized gas carrier
1.A
2.B
3.C 
4.D
42. The purpose of economiser is to:
  1. Decrease the capacity and size of the auxiliary boiler
  2. Cooling down the exhaust gases in order to reduce NOx emission
  3. Allowing Sox to react at low temperatures with water to form acids thus reducing Sox emission
  4. Increasing the overall efficiency of the main propulsion plant
43. The fuel pumps used in modern intelligent engines:
A. Deliver to a common rail
B. Are hydraulically operated
C. Are valve operated
D. Either A or B
44. When fuel is injected late into a diesel engine cylinder,
a)the exhaust will be clear
b)fuel consumption will be low
c)all the fuel will be burned at top dead center
d)fuel consumption will be high
The direction of flow of cooling water in an engine is always _________.
A. From top to bottom
B. From bottom to top
C. From left to righ
D. From right to left
In Chain drives, chain damage can take place:
A. Only if the chain is too tight
B. Only if the chain is too slack
C. If the chain is too tight or too slack
D. None of the above
Which of the following is an important factor in hydrodynamic lubrication?
A. Viscosity of the lubricating oil.
B. Relative speed between lubricated surfaces.
C. Bearing clearance
D. All of the above.
The purpose of downcomers in a water tube boiler is :
A. To allow the steam to rise to the steam drum
B. To allow cold water to sink to the bottom
C. To protect the fire wall tubes
D. They are one type of generating tubes
Which of the following reduce fatigue endurance limit in engine components?
A. Surface flaws
B. Stress raisers like oil holes, change in sections etc
C. Corrosive environment
D. All of the above.