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单选题 The desirable properties of a marine fuel oil should include ______
学科：轮机英语阅读（22232学期）
时间：2024-06-26 04:26:33
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题目1单选题
For an ordinary modern marine four-stroke engine the inlet valves open ______A. after BDCB. before TDCC. before BDCD. after TDC
题目2单选题
In a single acting, four-stroke/cycle diesel engine, the power impulse in an individual cylinder occurs ______A. once every two crankshaft revolutionsB. once every crankshaft revolutionC. once every piston strokeD. twice every piston stroke
题目3单选题
The period when both inlet valves and exhaust valves are open is referred to as ______A. valve uniflowB. valve loopC. valve overlapD. valve grinding
题目4单选题
During ______ the air in the cylinder is compressed. <img src="https://tihai-oss-cloud.itihey.com/img/3052c70b902f1bc87a63df0da247427e.png">A. the exhaust strokeB. the suction strokeC. the compression strokeD. the expansion stroke
题目5单选题
In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the ______A. exhaust manifoldB. pressure of the fresh air chargeC. valve adjusting gearD. valve bridge
题目6单选题
The desirable properties of a marine fuel oil should include ______A. low heating value and high sulphur contentB. low flash point and high viscosityC. high calorific value and low sulphur contentD. high flash point and high viscosity
题目7单选题
Fuel injection begins during the compression stroke, before the piston reaches ______A. bottom centerB. BDCC. top centerD. TDC
题目8单选题
For an ordinary four-stroke engine the exhaust valves open ______A. after TDCB. before TDCC. before BDCD. after BDC
题目9单选题
Effective horsepower is the power developed by the ______ in the cylinder, but some of this is lost by friction within the engineA. pistonB. crankC. crankshaftD. connecting rod
题目10单选题
During ______ the gases are driven out of the cylinder by the piston. <img src="https://tihai-oss-cloud.itihey.com/img/64303bc0da1442d8c0c3f0c80234ce23.png">A. the compression strokeB. the exhaust strokeC. the suction strokeD. the expansion stroke
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