单项选择题

The exhaust system of a diesel engine is usually designed to remove exhaust gases and to （）

A.provide exhaust back pressure
B.prevent exhaust smoke emissions
C.power a reciprocating supercharger
D.muffle exhaust gas noise

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单项选择题

Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）

A.Plugged injector nozzles
B.Excessive fuel injection
C.Very late injection timing
D.Incorrect crankshaft clearance

单项选择题

If you were inspecting the valve springs on an auxiliary diesel engine, your best indication of impending spring failure would be （）

A.a glazed surface on the spring
B.nicks in the protective coating
C.a build up of sludge deposits
D.cracks in the surface of the spring

单项选择题

Which of the routine maintenance procedure listed is required for starting air receivers?（）

A.Frequent draining of accumulated moisture
B.Frequent testing of relief valves
C.A close watch on temperature to prevent fluctuations in pressure
D.Frequent cleaning to re move oil and foreign matter