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单选题 1分

One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve c...

One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the_____
  • A. motor overload will open
  • B. relief valve will open
  • C. pump will overheat
  • D. motor will overheat
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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.
  • C. Steam pressure leaving the drum will increase
  • D. Steam temperature in the drum will decrease.
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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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