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

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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

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