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单选题
The piston rings if found worn out （） and supplied by shipchandler.
A
must replace
B
must to be equipped
C
has to be repaired
D
have to be renewed
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Before replacing a piston you should check that all rings are ___.A.freeB.fastenedC.brokenD.stuck
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单选题If the piston groove drain holes for the oil control rings become clogged, which of the following is likely to occur?（）A
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单选题Worn main bearings in a diesel engine can result in （）A
decreased compression pressureB
increased lube oil pressureC
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单选题Insufficient end clearance on newly fitted piston rings in a diesel enginewill cause the rings to（）A
jam in the most worn part of the cylinder when the rings expandB
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单选题In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）A
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knurling the piston skirtC
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单选题When good and steady service conditions have been achieved, the running surfaces of the piston rings and cylinder liner will be（）In addition, the rings will move freely in the grooves and also be well oiled intact, and not unduly worn.A
hazy lightB
hazy light brownC
hazy light blueD
hazy light grey
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单选题In a medium speed diesel engine, a trunk type piston may be cooled by（） Ⅰ.oil circulation though passages in the piston crown Ⅱ.heat transfer through piston rings and liner wallA
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考题
单选题Before replacing a piston you should check that all rings are （）.A
freeB
fastenedC
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单选题These piston rings are so badly worn that they must be （）.A
renewedB
weldedC
machinedD
chromium-plated
考题
单选题Oil is supplied to the cylinder wall and （） by means of mechanical lubricators.A
the cylinder coverB
the piston ringsC
the piston crownD
the piston skirt
考题
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
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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
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单选题The function of the piston compression rings used in a diesel engine is to （）A
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reduce the amount of combustion gas blow-byD
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seal the space between the piston and the linerB
reduce the amount of lube oil burned in the combustion chamberC
transmit heat from the piston to the cylinder linerD
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单选题Each piston stuffing box is provided with two sealing rings and three（）A
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单选题If the piston ring gap remains insufficient when installing new rings, youshould（）A
install oversized ringsB
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compress the rings tighter with a compressing toolD
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考题
单选题If a used lube oil analysis indicates an excessive chromate content, this means （）A
air filtration is inadequateB
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fuel oil is leaking into the lube oilD
the piston rings are excessively worn
考题
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
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单选题If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）A
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the same pistonB
the piston nearbyC
the other pistonsD
the generators on board
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