Questions
81
Working of a pulse pressure turbocharger depends upon the ___________ that can be safely created in the exhaust system.
Answer: Pressure pulses
82
The maximum elongation of timing chains in service is limited to ___________ of original chain length.
Answer: 2%
83
Routine cleaning of air side of air cooler of main engine is done by:
Answer: Circulating warm chemical solution
84
What prevents rotation and fretting between a thin shell bearing and its housing?
Answer: The nip or crush of the bearing
85
Microbial degradation of main engine sump oils can lead to:
Answer: All of the above
86
In case of constant pressure turbo charging, the exhaust of the cylinders goes into:
Answer: Exhaust compensators
87
Which of the following is a limiting factor in cylinder liner cooling?
Answer: Dew point for formation of sulfuric acid
88
Which of the following is not a consequence of over lubrication of a cylinder liner?
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:
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?
Answer: Detergent
91
In the _____ type of t/c 2/s diesel engine is _____ to start.
Answer: constant, difficult
92
Modern marine turbochargers use a ___________ type of compressor
Answer: Axial flow
93
For a main engine fuel system which has a 5 micron filter ,a super decanter is usually fitted ___
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?
Answer: Surging of the turbocharger.
95
What is the meaning of the term "valve clearance"?
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?
Answer: Semi built, all welded type
97
A unit type fuel injector is used on a diesel engine to
Answer: all of the above
98
Too high Calculated Carbon Aromaticity index (CCAI) of fuel oil indicates:
Answer: Increased ignition delay
99
Generator over speed trip what will u check
Answer: governor is not responding (ANS)
100
With full load on the main engine, the turbocharger tachometer reads: Too low RPM. Why?
Answer: Pick up for tachometer is wrongly adjusted.
