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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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residual carbon depositsB
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fuel knockB
increased powerC
low compression pressureD
high exhaust temperature
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oil suction line restrictionB
correct amount of coolantC
cavitation erosion in the water jacketsD
clogged sea suction strainer
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单选题What condition will result in the automatic shutdown of a diesel engine? （）A
High jacket water pressureB
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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单选题Operating a diesel engine under light loads and at low temperatures for an exhaust for an extended period can result in（）A
formation of carbon on the intake and exhaust portsB
high water jacket temperaturesC
overheated pistons and cylindersD
an increase in lube oil viscosity due to fuel dilution
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单选题A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（）A
gapB
sideC
backD
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单选题Significant retardation of a diesel engine fuel injection timing will result in （）A
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 water produced during combustionB
the sulfur in the fuelC
unburned fuel oilD
all of the above
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slight alkalinityC
excessive alkalinityD
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high oil pressureB
excessive bearing end playC
plugged oil control ringsD
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excessive freshwater corrosionC
scale formation on the saltwater sideD
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friction within the engineC
mechanical condition of the superchargerD
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oil foaming will occurB
large quantities of oil are consumedC
lube oil viscosity is always decreasedD
corrosive by-products are usually formed
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