單項選擇題If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler, the cause maybe （）.

A.high steam pressure in the boiler
B.abnormally high feed water temperature
C.abnormally high boiler water temperature
D.steam demand exceeding feed pump capacity


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1.單項選擇題Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?（）

A.Clogged air intake falters
B.Piston blow-by
C.A defective after-cooler
D.Faulty exhaust valves

3.單項選擇題The crankcase of many diesel engines are kept under a slight vacuum by the （）.

A.scavenging action of the piston
B.piston type vacuum pump taking suction off a differential manometer
C.gland exhausting manometer
D.crankcase exhaust fan

4.單項選擇題Fins are installed on the generating tube surfaces in waste heat boilers to （）.

A.prevent soot fires in the exhaust system
B.prevent exhaust gas erosion of the tubes
C.increase the velocity of exhaust gas flow
D.increase the rate of heat transfer

5.單項選擇題On a medium-speed main propulsion diesel engine, the crank-pin or crank journal bearings receive lubricating oil from （）.

A.a spindle lubricator
B.an oil jet
C.internal splashing
D.drilled passages in the crankshaft