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单选题
The main function of piston compression rings is to （）
A
prevent excessive cylinder liner wear
B
reduce friction losses in the engine
C
seal the space between the piston and the liner
D
limit upward flow of lube oil into the combustion space
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单选题Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.A
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单选题Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which（）A
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单选题Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?（）A
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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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单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）A
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Low firing pressure and high exhaust temperatureC
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单选题Each piston stuffing box is provided with two sealing rings and three（）A
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install oversized ringsB
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单选题The function of diesel engine piston compression rings is to （）.A
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单选题If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）A
excessive ring actionB
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单选题Piston compression rings used in a diesel engine function to （）A
transfer heat from the cylinder to the pistonB
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seal the combustion space from the crankcasesD
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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
micro-seizureB
stickingC
scratchedD
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单选题Around the combustion chamber, all the main components are bore cooled to give low strains and the smallest, circumferentially symmetric deformations for good sealing between piston rings and liner（）A
thermalB
mechanicalC
plasticD
elastic
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