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单选题 The lowest ring of a piston is _____
学科：轮机英语
时间：2023-12-20 01:38:39
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题目1单选题
The pistons are cooled by oil ____ the forced lubrication systemA. supplied fromB. supplying toC. being supplied forD. to be supplied to
题目2单选题
The piston rods are bored from the top flange to a point opposite the centre of ____A. the main bearingB. the crankshaftC. the dowel pinD. the crosshead
题目3单选题
The lowest ring of a piston is _____A. a coil springB. a sealing ringC. an oil distributor ringD. main seal ring
题目4单选题
Among the rings of a piston the _____ one is subjected to the greatest load and temperatureA. bottomB. middleC. topD. none of the others
题目5单选题
Top piston rings are plasma coated. It gives added safety for the_________ of new linesA. running-inB. running-outC. running onD. running down
题目6单选题
The piston rings are manufactured with a diameter _____ the bore of the cylinderA. larger thanB. smaller thanC. equal toD. none of the above
题目7单选题
A diesel engine piston ring face is in direct contact with the _____A. top of the ring grooveB. cylinder liner oil filmC. bottom of the ring grooveD. back of the ring groove
题目8单选题
_____ pistons have low inertia and high coefficient of thermal expansionA. Cast ironB. Cast steelC. Forged steelD. Aluminum
题目9单选题
In order to control thermal stresses, some types of modern engines use pistons with _________A. heavy wall and intensive coolingB. heavy wall and no coolingC. thin wall and no coolingD. thin wall and intensive cooling
题目10单选题
The purpose of the skirt or trunk in four-stroke cycle engines is to act in a similar manner to a _____A. crossheadB. crownC. piston rodD. connecting rod
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