單項選擇題In a four-stroke/cycle diesel engine, the camshaft rotates at （）

A.twice the crankshaft speed
B.half the crankshaft speed
C.the same speed as that of the crankshaft
D.a speed independent of that of the crankshaft


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1.單項選擇題A restricted air intake to a diesel engine may result in the engine （）.

A.failing to reach rated speed
B.knocking under maximum load
C.hunting or surging under light load
D.overspeeding and running away

2.單項選擇題Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.

A.cooling water pump
B.nozzle cooling passages
C.cylinder jackets
D.heat exchanger

3.單項選擇題Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.

A.the power stroke
B.the compression stroke
C.low load operation only
D.periods of standby

5.單項選擇題In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.

A.suction pressure regulator
B.thermostatic bypass valve
C.sea water temperature
D.water level in the expansion tank