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单选题 The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is ______
学科：轮机英语
时间：2024-04-15 08:23:39
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题目1单选题
The rotating range of the low speed diesel engine is usually lower than____A. 100rpmB. 200rpmC. 300rpmD. 500rpm
题目2单选题
The diesel engine is similar to the gasoline engine in that ______A. both of them are ignited by compressed airB. both of them are the forms of external combustion enginesC. both of them have spark plugsD. the power is developed by the piston in the cylinder
题目3单选题
The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is ______A. they operate between 150 and 450 rpmB. they are connected to the propeller by gearingC. their smaller size and weightD. they can be connected directly to the propeller without gearing
题目4单选题
Gas turbines differ from steam turbines in that ______A. steam rather than gas is used to turn a shaftB. vapor rather than gas is used to turn a shaftC. the former uses gas to turn a shaftD. the latter uses gas to turn a shaft
题目5单选题
Propulsion of the vast majority of contemporary merchant ships (especially containerships and VLCCs) utilizes____ as prime moverA. gas turbineB. diesel engineC. steam engineD. gasoline engine
题目6单选题
Typical marine propulsion plants include____ directly coupled to the vessel's single large-diameter, fixed-pitch propellerA. a single, long-stroke, slow-speed, turbocharged, two-stroke diesel engineB. a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engineC. two medium-speed, turbocharged, four-stroke diesel enginesD. a variable-speed AC generator
题目7单选题
A charge of fresh air is drawn into the engine cylinder and then _____ by the moving piston_____ very high pressureA. pressed/toB. pressurized/withC. pushed/inD. compressed/to
题目8单选题
A diesel engine is similar to a gasoline engine except that the former has no _____A. cross-headB. cylinderC. connecting rodD. spark plug
题目9单选题
A low speed engine requires___ reduction gearbox____ it and propellerA. none, bothB. no, bothC. none, betweenD. no, between
题目10单选题
As a heat engine, _____ energy is the source of power by which the diesel engine can be operatedA. electricB. heatC. mechanicalD. exhaust
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