單項選擇題Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）

A.amount of scavenge air to the cylinder
B.quality of fuel injected
C.viscosity of the lube oil
D.compression ratio of the piston


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1.單項選擇題Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?（）

A.compression must be low for effective spark ignition
B.compression must be low for required horsepower and torque generation
C.compression must be low to prevent pre-ignition
D.compression must be low to have effective pre-ignition

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題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