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Free download in PDF Marine Engineers MCQs 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.
101
Vacuum priming pumps which work on the principle of fixed vane pumps require _____________for___________ clearance between vane tips and casing.
[A]
Lube oil, lubricating
[B]
Lube oil, sealing
[C]
Water, sealing
[D]
Gland packing, sealing
102
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
Answer: Leaking discharge valve
103
Which of the following can be done to reduce the cold corrosion of Main Engine cylinder liners using high sulphur fuel oil :-
[A]
Increasing cylinder oil feed rate
[B]
Using high TBN cylinder oil
[C]
Increasing scavenge air temperature
[D]
Decreasing cylinder oil feed rate
Answer: Using high TBN cylinder oil
104
When pressure inside a system falls below that of the vapour pressure of the liquid Cavities r formed, cavities travelling to high pressure region collapses releasing Considerable energy damage the metal surface which is known as
[A]
Cavitation
[B]
Erosion
[C]
Impingment Corrosion
[D]
Cavitation Erosion
Answer: Cavitation Erosion
105
Copper tubing is used in refrigerant system because
[A]
It has less internal resistance
[B]
It is cheaper compared to other materials.
[C]
It is easier to check leaks in copper based system
[D]
None of the above
Answer: It has less internal resistance
106
Which of the following V/V cannot be overhauled in place without removing piping?
[A]
BallValve
[B]
Diaphragm valve
[C]
Globe valve
[D]
Butterfly valve
107
After maintaining correct discharge pressure , soon ceases to discharge water what are possible cause?
[A]
Pressure gauge wrong
[B]
Pump sucking air
[C]
Discharge valve throttled
[D]
Casing wear ring is worn
108
Which of the following is a correct point for sampling of system lube oil for on board or shore analysis?
[A]
Standpipes
[B]
Purifier outlets
[C]
Inlet or outlet of L. O. coolers
[D]
Tank drains
Answer: Inlet or outlet of L. O. coolers
109
Increasing the rotational speed of a cargo pump the pump flow rate will:
[A]
Increase in direct proportion to the increase in speed
[B]
Decrease in direct proportion to the increase in speed
[C]
Flow rate doesn???t depend upon speed
[D]
Flow
Answer: Increase in direct proportion to the increase in speed
110
Surface preparation of steel surfaces , prior carrying out painting is important because (choose the best alternative) :
[A]
Any rust and contaminant inclusions may cause local paint film breakdown
[B]
Too much paint will be consumed if surface preparation is not carried out
[C]
Surface will be very rough if proper surface preparation is not carried out
[D]
Surface preparation deposits a chemical onto steel surface which reacts with paint film and causes strong bonding
Answer: Too much paint will be consumed if surface preparation is not carried out
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