單項(xiàng)選擇題Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）

A.chromium plating piston rings
B.knurling the piston skirt
C.extended maximum power operation
D.applying load to a cold diesel engine


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1.單項(xiàng)選擇題If the relief valve on a diesel engine cylinder lifts, the cause could be due to （）

A.liquid in the cylinder
B.low compression in the cylinder
C.high exhaust temperature
D.poor fuel penetration

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)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