单项选择题
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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相关考题
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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 -
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
