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单选题
What harmful condition can result if a diesel engine is operated at very light loads for long periods of time?（）
A
increased carbon buildup
B
burning of intake valves
C
excessive firing pressures
D
increased fuel consumption
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fuel knockB
increased powerC
low compression pressureD
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oil suction line restrictionB
correct amount of coolantC
cavitation erosion in the water jacketsD
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单选题What condition will result in the automatic shutdown of a diesel engine? （）A
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High lube oil pressureC
Low lube oil pressureD
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单选题What is the effect of heated intake air on a diesel engine? （）A
Increases efficiencyB
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formation of carbon on the intake and exhaust portsB
high water jacket temperaturesC
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smoother engine operationB
advanced fuel ignitionC
increased fuel economyD
reduced engine power
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low oil pressureB
high coolant pressureC
leaking fuel injectorD
cracked cylinder head or liner
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the sulfur in the fuelC
unburned fuel oilD
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excessive bearing end playC
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excessive freshwater corrosionC
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mechanical condition of the superchargerD
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oil foaming will occurB
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