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单选题
Maximum horsepower of a diesel engine is attained （）.
A
when the engine RPM is pulled down by overload
B
at rated engine RPM
C
at 95 % of rated engine RPM
D
at 95 % of a properly adjusted governor RPM with the engine under full load
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考题
单选题Maximum horsepower of a diesel engine is attained （）.A
when the engine RPM is pulled down by overloadB
at rated engine RPMC
at 95 % of rated engine RPMD
at 95 % of a properly adjusted governor RPM with the engine under full load
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考题
单选题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 ignitionB
compression must be low for required horsepower and torque generationC
compression must be low to prevent pre-ignitionD
compression must be low to have effective pre-ignition
考题
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考题
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考题
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glazed liners or pistonsB
high lube oil pressureC
excessive compression ratioD
worn valve seats and valves
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