101
Vacuum priming pumps which work on the principle of fixed vane pumps require _____________for___________ clearance between vane tips and casing.
Answer: Water, sealing
Questions
102
The flow rate through a F.O. transfer pump will not be affected by which of the following factors?
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 :-
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
Answer: Cavitation Erosion
105
Copper tubing is used in refrigerant system because
Answer: It has less internal resistance
106
Which of the following V/V cannot be overhauled in place without removing piping?
Answer: Butterfly valve
107
After maintaining correct discharge pressure , soon ceases to discharge water what are possible cause?
Answer: Pump sucking air
108
Which of the following is a correct point for sampling of system lube oil for on board or shore analysis?
Answer: Inlet or outlet of L. O. coolers
109
Increasing the rotational speed of a cargo pump the pump flow rate will:
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) :
Answer: Too much paint will be consumed if surface preparation is not carried out
