單項選擇題On a turbo-charged, medium-speed diesel engine, which of the following problems is an indication of a restricted air intake passage?()

A.Engine is hard to start
B.Engine misses
C.Surges at governed RPM
D.Coolant temperature is too low


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1.單項選擇題The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by ()

A.regulating the level of corrosion inhibitor in the primary cooling system
B.the level of the freshwater expansion tank
C.varying the engine load to meet temperature requirements
D.the operation of the thermostatic valve

2.單項選擇題For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an ().

A.oil spray
B.oil bath
C.oil control rings
D.drilled passage through the camshaft

3.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

4.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

5.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