轮机英语【轮机长】题库

单选题 1分

To add refrigerant to the high side of an air conditioning system, you should introduce the refriger...

To add refrigerant to the high side of an air conditioning system, you should introduce the refrigerant through the____ .
  • A. discharge service valve as a vapor
  • B. suction service valve as a liquid
  • C. charging valve as a liquid
  • D. condenser purge valve as a vapor
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1 单选题 1分
Fireside burning of boiler tubes can be a result of _______.
  • A. slag deposit
  • B. improper atomization
  • C. soot accumulations
  • D. waterside deposits
2 单选题 1分
Fireside burning of boiler tubes is usually the direct result of _______.
  • A. high furnace temperatures
  • B. gas laning(收缩,原型lane) in tube banks
  • C. oxygen corrosion of metallic surfaces
  • D. overheating due to poor heat transfer
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Waterside scale in a fire-tube boiler may cause______.
  • A. increased heat transfer
  • B. fireside erosion
  • C. high steam demand
  • D. overheated tubes
5 单选题 1分
Which of the following problems can occur when an excessive number of water screen tubes are plugged?
  • A. Superheater outlet pressure will rise.
  • B. Superheater outlet temperature will rise.
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  • D. Steam temperature in the drum will decrease.
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相关试卷

第一章 船舶主推进装置
第二章 船舶辅助机械
第三章 船舶电气和自动化
第四章 船舶轮机管理业务
第五章 国际公约、规则
专项训练一
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