單項選擇題If a used lube oil analysis indicates an excessive chromate content, this means （）

A.air filtration is inadequate
B.engine coolant leaking into the lube oil
C.fuel oil is leaking into the lube oil
D.the piston rings are excessively worn


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2.單項選擇題A lube oil sample taken from the main engine lube oil system has dark yellow opaque color.This is the result of （）

A.water contamination
B.mixing oils of two widely different viscosities
C.overheating
D.aeration

3.單項選擇題When you are transferring fuel oil to the setting tanks, precautions to be observed should include （）

A.plugging gooseneck tank vents to prevent accident overflow
B.maintaining a high transfer rate until a slight trickle of oil is observed flowing from the overflow line
C.sounding the tanks frequently and reducing the transfer rate as the level approaches maximum fill
D.maintaining a supply of chemical dispersant to cleanup minor oil spills adjacent to the ship

4.單項選擇題Heavy fuel oils generally have an upper average ash content of 0~1% by weight.Which of the following conditions could be expected if the ash content increase above this amount?（）

A.Glazing of the cylinder liners
B.Increase valve wear
C.Excessive oil pumping
D.Increase fuel consumption

5.單項選擇題The flash point of a residual fuel oil should be used to determine the highest temperature to which oil may be heated （）

A.for atomizing
B.for centrifuging
C.in a storage tank
D.in the re-circulating line