单项选择题
A.chromium plating piston rings B.knurling the piston skirt C.extended maximum power operation D.applying load to a cold diesel engine
If the relief valve on a diesel engine cylinder lifts, ...
单项选择题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
Which of the following operation will have a direct imp...
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
Which of the following reasons represents why the desig...
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
