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单选题 In the merchant ship, a propeller,in order to operate efficiently, must rotate( )
学科：轮机英语
时间：2023-11-07 22:53:42
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题目1单选题
The main operating characteristic 主要运行特征of diesel engines 柴油机which distinguishes them from区别于 other internal combustion engines内燃机 is the( )A. method of supplying airB. cooling systemC. method of igniting fuel燃油点火方式D. valve operating mechanism
题目2单选题
The low speed diesel engines 低速柴油机are tall 高的to allow for 考虑到,顾及long strokes长行程 which improve改善 engine( )A. flexibilityB. efficiency效率C. reliabilityD. controllable ability
题目3单选题
A slow speed or medium speed diesel engine is a high pressure propulsion plant with.( )A. low temperatureB. internal combustionC. spark plugD. gear box
题目4单选题
Diesel engines are classified as reciprocating internal combustion engines because they( )A. use energy from fuel burned outside their cylindersB. burn fuel in a combustion chamber that moves back and forthC. burn fuel in a chamber where its energy moves a piston up and downD. a continuous combustion process to impart rotary motion to the pistons
题目5单选题
The diesel engines have an important role in the shipping industry of their improved engine efficiencies and designs compared to other forms of propulsion such as steam or gas( )A. turbinesB. enginesC. machinesD. mechanisms
题目6单选题
The three largest categories of ships are container ships,( ) (for bulk goods such as grain, coal, ores, etc.) and tankers, which again can be divided into more precisely defined 24classes and typesA. bulk carriersB. general cargo shipsC. passenger shipsD. reefers
题目7单选题
Of all types of commercial(商用) internal combustion engines now built, which one usually gives thebest performance,and hence it is quite commonly used in marine applications(应用),especially(尤其) in larger sizes?( )A. Steam engineB. Gasoline engineC. Gas turbineD. Diesel engine
题目8单选题
Gas turbines differ from steam turbines in that( )is used to turn a shaftA. gas rather than steamB. steam rather than gasC. fuel rather than steamD. steam rather than exhaust
题目9单选题
In the merchant ship, a propeller,in order to operate efficiently, must rotate( )A. at relatively low speedB. at anticlockwise speedC. at relatively middle speedD. at clockwise speed
题目10单选题
Increasing the compression ratio压缩比 of a diesel engine while maintaining保持 the designed rate速率 of fuel flow will result in ( )A. increased horsepowerB. reduced efficiencyC. increased heat lossD. lower cylinder pressure
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