Marine Engineers Quiz | Marine Engineers MCQs and Answers

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Questions
81 Working of a pulse pressure turbocharger depends upon the ___________ that can be safely created in the exhaust system.
A Enthalpy drop
B Pressure difference
C Turbocharger rpm
D Pressure pulses

Answer: Pressure pulses
82 The maximum elongation of timing chains in service is limited to ___________ of original chain length.
A 2%
B 1%
C 5%
D 3%

Answer: 2%
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83 Routine cleaning of air side of air cooler of main engine is done by:
A Circulating fresh water
B Circulating cold chemical solution
C Circulating warm chemical solution
D Circulating hot water

Answer: Circulating warm chemical solution
84 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

Answer: The nip or crush of the bearing
85 Microbial degradation of main engine sump oils can lead to:
A Increased clogging of lube oil filters
B Corrosive attack on journals and bearings
C Formation of stable emulsions
D All of the above

Answer: All of the above
86 In case of constant pressure turbo charging, the exhaust of the cylinders goes into:
A Small diameter exhaust pipes with exhaust grouping
B Exhaust compensators
C Nozzles
D Large diameter pipes

Answer: Exhaust compensators
87 Which of the following is a limiting factor in cylinder liner cooling?
A Maximum combustion temperature
B Minimum liner temperature
C Exhaust temperature
D Dew point for formation of sulfuric acid

Answer: Dew point for formation of sulfuric acid
88 Which of the following is not a consequence of over lubrication of a cylinder liner?
A Deposits in piston top land which can not only consume lube oil but always lead to increased abrasive wear
B Sticking and jamming of piston rings due to increased deposits.
C Unburnt lube oil in scavenge spaces posing increased risk of scavenge fire
D Increased corrosive wear

Answer: Deposits in piston top land which can not only consume lube oil but always lead to increased abrasive wear
89 Variable geometry turbocharging is the preferred choice over conventional turbochargers because:
A T/C efficiency is very high at high engine loads
B T/C has good starting characteristics while efficiency at full loads is slightly compromised
C T/C efficiency is optimized for different engine loads by changing nozzle ring geometry
D T/C is much cheaper and simple to manufacture and is virtually maintenance free

Answer: T/C efficiency is optimized for different engine loads by changing nozzle ring geometry
90 What type of lubricating oils is generally used in auxiliary engines?
A Detergent
B Alkaline
C Synthetic
D It is not important

Answer: Detergent
91 In the _____ type of t/c 2/s diesel engine is _____ to start.
A constant, easier
B constant, difficult
C pulse, difficult
D none of the above

Answer: constant, difficult
92 Modern marine turbochargers use a ___________ type of compressor
A Radial flow
B Axial flow
C Mixed flow
D Turbulent flow

Answer: Axial flow
93 For a main engine fuel system which has a 5 micron filter ,a super decanter is usually fitted ___
A before the purifier
B after the purifier
C after the 5 micron filter to ME
D before the horizontal clarifier

Answer: before the purifier
94 The timing of the engine is delayed. The exhaust temperatures are high. How would you expect this to affect the turbocharger?
A Decreased turbocharger revolutions.
B Surging of the turbocharger.
C Increased turbocharger revolutions
D Higher air and gas temperature after turbocharger.

Answer: Surging of the turbocharger.
95 What is the meaning of the term "valve clearance"?
A The clearance between the rocker arm and valve pushrod.
B The clearance between valve spindle disc and seat.
C The clearance between the rocker arm and camshaft pushrod.
D The clearance between the rocker arm and valve pushrod in either warm or cold state.

Answer: The clearance between the rocker arm and valve pushrod.
96 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
97 A unit type fuel injector is used on a diesel engine to
A meter the fuel
B produce the proper fuel oil pressure
C atomize the fuel
D all of the above

Answer: all of the above
98 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

Answer: Increased ignition delay
99 Generator over speed trip what will u check
A governor is not responding (ANS)
B fuel system
C moving parts (crank shaft)
D all of the above

Answer: governor is not responding (ANS)
100 With full load on the main engine, the turbocharger tachometer reads: Too low RPM. Why?
A Damaged connection between pick- up and tachometer unit
B Pick up is not connected to turbocharger.
C Turbocharger need to be cleaned/ overhauled.
D Pick up for tachometer is wrongly adjusted.

Answer: Pick up for tachometer is wrongly adjusted.

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