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Free download in PDF Marine Engineers Multiple Choice Questions with Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
61
As per regulations, within how many hours before each departure, satisfactory working of the steering gear must be checked?
[A]
2
[B]
12
[C]
24
[D]
None of the above
62
Modern 4-stroke medium speed, marine diesel engine exhaust valve spindles are rotated by providing
[A]
Nozzle rings
[B]
Tappet clearance
[C]
Spinners or vanes
[D]
Rotocaps
63
Microbiological growths in marine fuel are a common occurrence that can be
[A]
extremely detrimental to equipment and operating processes
[B]
prevented by maintaining proper storage temperatures
[C]
removed from emulsified fuel oil during the centrifuging processes
[D]
All of the above are correct.
Answer: extremely detrimental to equipment and operating processes
64
The function of the tie rods is to:
[A]
Keep the engine components under tension at all the times
[B]
Just secure the engine parts together
[C]
Act as holding down bolts for the bedplate and keeps all the engine components together
[D]
Keep engine components under high compression, so that tensile stresses acting during firing stroke do not exceed this pre-compression to avoid fatigue failure
Answer: Keep engine components under high compression, so that tensile stresses acting during firing stroke do not exceed this pre-compression to avoid fatigue failure
65
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
Answer: Semi built, all welded type
66
After an engine has been started using a Bendix drive unit, the drive gear, or pinion disengages from the flywheel due to
[A]
the action of a spring
[B]
rotation of the starting cam
[C]
the higher rotating speed of the flywheel
[D]
accumulator pressure
Answer: the higher rotating speed of the flywheel
67
Fuels as produced in a refinery are generally sterile, however, contamination can occur as fuels are
[A]
stored at the refinery
[B]
stored on the vessel
[C]
transported to the distribution sites
[D]
All of the above are correct.
Answer: All of the above are correct.
68
Which of the following statements is false?
[A]
Excessive cylinder liner lubrication can aggravate scuffing.
[B]
Use of anti polishing ring reduces scuffing.
[C]
Deep honing of liner fails to give an ideal liner surface.
[D]
None of the above
Answer: None of the above
69
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
Answer: By checking the witness mark provided for reference.
70
Which of the following is one of the major advantages of resin choking over cast iron choking, in holding down arrangements of modern diesel engines?
[A]
Better vibration damping properties.
[B]
Better compressive strength
[C]
100% contact, no need for surface preparation
[D]
None of the above
Answer: 100% contact, no need for surface preparation
71
In a 2-stroke crosshead type of engine, the side thrust generated due to rolling and connecting rod and fore-aft thrust due to pitching motion of the ship is taken care of by the:
[A]
Piston and the liner
[B]
Connecting rod and the piston rod
[C]
Crosshead shoes and guides
[D]
Crankpin and thrust bearing
Answer: Crosshead shoes and guides
72
In a VIT equipped jerk type fuel pump:
[A]
Raising the barrel delays beginning of injection
[B]
Lowering the barrel delays beginning of injection
[C]
Raising the barrel delays end of injection
[D]
Lowering the barrel delays end of injection
Answer: Raising the barrel delays beginning of injection
73
The over speeding of the diesel engine driving an electric generator could cause
[A]
low voltage trip to trip
[B]
reverse power trip to trip
[C]
damage to windings
[D]
excessive exhaust temperatures
Answer: damage to windings
74
In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?
[A]
Bed plate
[B]
Column
[C]
Entablature
[D]
Tie rod
75
Presence of catalytic fines in fuel oil is significant to engineers on board because
[A]
Catalytic fines tend to impair proper operation of purifiers
[B]
Catalytic fines lead to abrasive wear in liners, piston rings and fuel injection equipment
[C]
Catalytic fines necessitate increase in injection temperature
[D]
Catalytic fines necessitate increase in storage temperature
Answer: Catalytic fines lead to abrasive wear in liners, piston rings and fuel injection equipment
76
Which of the following factors affect penetration of fuel droplets during injection?
[A]
Quality of atomization
[B]
Injection temperature
[C]
Scavenge air pressure
[D]
All of the above.
Answer: All of the above.
77
Lube oil pumps taking suction from the sump of most small marine engines are usually
[A]
of the diaphragm type
[B]
of the centrifugal type
[C]
positive displacement type
[D]
independently driven by electric motors
Answer: positive displacement type
78
Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent
[A]
excessive crankcase pressure
[B]
excessive lube oil temperature
[C]
contamination of the lube oil by water
[D]
contamination of the cooling water by lube oil
Answer: contamination of the lube oil by water
79
Excessive axial thickness of a piston ring can lead to ____________________
[A]
Scraping off of oil from liner surface
[B]
Increased wear
[C]
Twisting in the groove
[D]
Difficulty in formation of oil wedge
Answer: Difficulty in formation of oil wedge
80
Cylinder heads of marine diesel engines are provided with _________ to relieve any excessive pressure within the combustion chamber
[A]
Safety valves
[B]
Indicator cocks
[C]
Relief valves
[D]
Bursting discs
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