Free download in PDF Marine Engineers Multiple Choice Questions and 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.
1
Which standards govern the specifications for supply of Residual Marine Fuels and Distillate Marine Fuels onboard merchant ships?
Answer: intake valves are less affected to the corrosive action of exhaust gases
5
Why is it essential to renew turbocharger bearings after a preset number of hours of running even if the bearings are in seemingly perfect condition?
A
Because they are prone to failure due to prolonged exposure to high temperature conditions.
B
Because they are subject to cyclic loading and are prone to failure due to metal fatigue.
C
It is not essential to renew if condition monitoring suggests perfect condition.
D
Lube oil contamination is bound to occur and affect the condition of the bearings.
12
For a two stroke engine two o-rings are provided on the liner. The function of the top oring is to ___________ and function of the lower o-ring is to ____________
A
Seal jacket cooling water; act as secondary seal in case 1st o-ring leaks
B
Seal jacket cooling water, Seal scavenge air
C
Seal scavenge air, Seal Jacket cooling water
D
Seal combustion gases, Seal jacket cooling water
Answer: pulse pressure, prevent interference with scavenging of other cylinders
17
After prolonged operation, jerk type fuel pumps wear on the top edge of plunger and edges of spill ports and helix due to erosion by high pressure fuel as it spills. This wear
would result in
A
Late start of injection and early end of injection
B
Early start of injection and late end of injection
C
Early start of injection and early end of injection
D
Late start of injection and late end of injection
Answer: Helps to keep the shaft cool by controlled leakage of air
19
It is a known fact that centrifugal pumps require priming for pumping liquids, as they cannot handle air and will lose suction due to air entry. But on the other hand T/Cs use centrifugal compressors for supercharging. Which of the following do you think makes a centrifugal compressor to pump air and behave differently than the centrifugal pumps?
A
Presence of air cooler
B
Presence of Labyrinth seal
C
High speed of rotation, very fine internal clearances and large impeller diameters
