單項(xiàng)選擇題In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.

A.metal particles loosened by wear
B.air when no air cleaners are used
C.condensation of water vapors
D.breakdown of the lubricating oil by dilution


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1.單項(xiàng)選擇題The amount of fuel injected in a particular time, or degree, of crankshaft rotation is termed （）.

A.metering
B.timing
C.rate of injection
D.rate of distribution

2.單項(xiàng)選擇題A crankshaft whose center of gravity coincides with its center line is said to be （）.

A.dynamically balanced
B.statically balanced
C.counter balanced
D.resonantly balanced

3.單項(xiàng)選擇題

When centrifuging heavy fuel oil, an important factor to consider is the （）
(1) flow rate
(2) viscosity of the fuel oil

A.(1) only is correct
B.(2) only is correct
C.both (1) and (2) are correct
D.neither (1) or (2) are correct

4.單項(xiàng)選擇題Higher than normal jacket water temperatures occurring in all cylinders of a diesel engine can result from a/an （）.

A.oil suction line restriction
B.correct amount of coolant
C.cavitation erosion in the water jackets
D.clogged sea suction strainer

5.單項(xiàng)選擇題Loss of lubricating oil pressure to the main propulsion diesel engine will actuate a/an （）.

A.overspeed trip
B.audible/visual alarm
C.the ships/boats general alarm
D.reserve oil storage tank