单项选择题
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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相关考题
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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 -
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
