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单选题
In a four-cycle diesel engine piston blow-by can result in increased（）
A
crankcase pressure
B
compression pressure
C
scavenge pressure
D
exhaust manifold pressure
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decreased compression pressureB
increased lube oil pressureC
lower lube oil temperatureD
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单选题Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）A
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knurling the piston skirtC
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drilled passage through the camshaft
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单选题Cracking of a diesel piston crown can result from（）A
Excessive piston to liner clearanceB
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chromium plating piston ringsB
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extended maximum power operationD
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residual carbon depositsB
lube oil viscosity breakdownC
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单选题When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）A
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improper piston coolingC
blow-byD
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考题
单选题Low compression of diesel engine may result from （）A
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any of A and BD
none of the above
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单选题In a diesel engine, blow-by is a result of combustion gases leaking into the crankcase past the （）A
wrist pin bushingsB
compression ringsC
cylinder liner sealsD
cylinder liner sealing ring
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单选题Late fuel oil injection in a diesel engine can result in （）A
fuel knockB
increased powerC
low compression pressureD
high exhaust temperature
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单选题Worn diesel engine intake valve guides can result in （）A
increased engine breathing efficiencyB
excessive valve lashC
excessive lube oil consumptionD
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单选题In a diesel engine, blow-by is generally the result of worn（）A
valve guidesB
oil control ringsC
valve seatsD
compression rings
考题
单选题Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）A
backB
sideC
gapD
bottom
考题
单选题Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）A
back clearanceB
side clearanceC
gap clearanceD
taper clearance
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单选题High firing pressures and a low exhaust temperature in a diesel engine may result from （）.A
decreased piston to cylinder head clearanceB
increased exhaust system back pressureC
early fuel injection timingD
low scavenge air temperature
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单选题Scuffed cylinder liner surfaces in a diesel engine can result form（）A
starting the engine hotB
knurling the piston skirtC
operating an overheated engineD
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单选题Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）A
low loading of that cylinderB
faulty combustion in that cylinderC
sluggish piston ring actionD
excessive piston cooling
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单选题On a diesel engine equipped with a hydraulic speed control governor, hunting in many cases can be corrected by adjusting the （）A
accumulator spring compressorB
balance pistonC
compensating needle valveD
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Insufficient cooling water flowC
Accumulated water in the air boxesD
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low oil pressureB
high coolant pressureC
leaking fuel injectorD
cracked cylinder head or liner
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单选题The function of diesel engine piston compression rings is to （）.A
prevent piston side thrustB
prevent engine friction lossesC
transmit heat from the piston to the cylinder linerD
remove oil from the cylinder combustion space
考题
单选题In a diesel engine, excessive cylinder liner wear will cause （） Ⅰ.increased blow-by Ⅱ.wear between the piston ring and grooveA
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Ⅱ only is correctC
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单选题Diesel engine piston seizure can be caused by （）A
poor cooling of cylinder wallsB
improper cooling of the pistonC
insufficient piston lubricationD
all of the above
考题
单选题A diesel engine piston crown can crack from （）A
excessive piston to liner clearanceB
excessive dirt beneath the piston crown that reduces heat transferC
faulty nozzle sprayD
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单选题Compared to a naturally aspirated diesel engine, a supercharged diesel engine has（）A
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