The piston ring grooves for a standard engine are （）
- Achromium-plate against wear
- Banti-corrosion treated
- Cwhite metal lined against wear
- Dflame hardened against wear
问题
The piston ring grooves for a standard
参考解析：
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1、If the back clearance of a piston ring
If the back clearance of a piston ring is excessive,（）Acompression pressure in the cylinder will be higherBcarbon will accumulate behind the ringCcombustion gases will penetrate beneath the ring landDpiston side thrust will be increased
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2、Excessive piston ring wear in a diesel
Excessive piston ring wear in a diesel engine will cause（）Ahigh lube oil viscosityBincreased lube oil consumptionClow lube oil temperaturesDhigh firing pressure
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3、A diesel engine piston ring face is in
A diesel engine piston ring face is in direct contact with the （）.Atop of the ring grooveBcylinder liner oil filmCbottom of the ring grooveDback of the ring groove
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4、Piston compression rings used in a die
Piston compression rings used in a diesel engine function to （）Atransfer heat from the cylinder to the pistonBscrape oil from the sides of the pistonCseal the combustion space from the crankcasesDprevent any piston contact with the cylinder liner
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5、The lowest ring of a piston is （）.
The lowest ring of a piston is （）.Aa coil springBa sealing ringCan oil distributor ringDmain seal ring
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6、The piston rings are manufactured with
The piston rings are manufactured with a diameter （） the bore of the cylinder.Alarger thanBsmaller thanCequal toDnone of the above