A. seal the space between the piston and the liner
B. reduce the amount of lube oil burned in the combustion chamber
C. transmit heat from the piston to the cylinder liner
D. damp out fluctuations of the piston side thrust
The primary purpose of oil control rings on a diesel piston is to( ).A. provide
[单选题]The main purpose of the piston oil scraper rings is to （）.A . 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 . damp out fluctua
[单选题]The piston rings are manufactured with a diameter （） the bore of the cylinder.A . larger thanB . smaller thanC . equal toD . none of the above
[单选题]The piston rings if found worn out （） and supplied by shipchandler.A . must replaceB . must to be equippedC . has to be repairedD . have to be renewed
[单选题]Among the rings of a piston the （） one is subjected to the greatest load and temperature.A . bottomB . middleC . topD . none of the above
[单选题]These piston rings are so badly worn that they must be （）.A . renewedB . weldedC . machinedD . chromium-plated
[单选题]The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.A．fed from mechanical lubricatorsB．thrown off from the main bearingsC．supplied from wick fed drip lubricatorsD．flow from a centrif
[单选题]The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving （）.A . an oil sealB . removing heatC . a gas sealD . cooling the pisto
[单选题]The main purpose of the text is to _______.A． describe children’s thinkingB．answer some questions children haveC．stress the importance of communicationD．advise parents to encourage their children
[单选题]The main purpose of the text is to _______.A． describe children’s thinkingB．answer some questions children haveC．stress the importance of communicationD．advise parents to encourage their children