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单选题 The piston has passed the top dead center position and is being moved down by the____as the crankshaft rotates
学科：默认课程
时间：2026-05-28 04:59:06
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题目1单选题
The liner is located within this jacket unit and____are provided to prevent waterleakageA. scraper ringsB. stuffC. compression ringsD. sealing rings
题目2单选题
____are mounted on and bolted to the bedplate cross girdersA. The crankshaftsB. The crankcasesC. The cylindersD. The frames
题目3单选题
The bearings used to support the crankshaft of a diesel engine are generally called____A. lineshaft bearingsB. connecting rod bearingsC. main bearingsD. support bearings
题目4单选题
The piston has passed the top dead center position and is being moved down by the____as the crankshaft rotatesA. main bearingsB. connecting rodC. through boltD. cylinder cover
题目5单选题
In each cylinder cover there are two or three holes for____A. the exhaust valvesB. the fuel valvesC. the indicator cocksD. the fuel pumps
题目6单选题
The____valves, as on the MC engines, are opened hydraulically and closed by an air springA. inletB. checkC. outletD. exhaust
题目7单选题
A____is the foundation of the engine, without the support of which the shaft alignment in particular, and engine structure as a whole, would inevitably be lostA. frameB. bedplateC. cylinderD. liner
题目8单选题
A rigid structure is necessary in order to preserve____of all engine parts, particularly the crankshaft and camshaft, and to minimize problems related to____of the structureA. alignment/vibrationB. alignment/noiseC. connection/vibrationD. connection/noise
题目9单选题
A crankshaft must be able to transmit the____developed during operation, which imposes stresses on the crankshaft journalsA. shearing strengthB. torqueC. bendD. extrusion
题目10单选题
Modem engines employ____diameter crank pins in order to provide____area bearings and low bearing loadsA. large/largeB. large/smallC. small/largeD. small/small
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