轮机英语【二三管】题库

单选题 1分

In the refrigeration system, a shortage of refrigerant is indicated by _____.

  • A.the compressor short cycling on high pressure cut out switch
  • B.high suction pressure
  • C.bubbles in the sight glass
  • D.high head pressure
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1 单选题 1分
Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause _____.
  • A.insufficient fuel delivery through that nozzle
  • B.fuel leakage into the nozzle drain line
  • C.fuel leakage before and after injection
  • D.erosion and cratering of the nozzle orifices
2 单选题 1分
3 单选题 1分
Motor controllers are seldom很少 troubled with grounds because _______
  • A.there are separate switches for the motor and the control
  • B.the contactors and relays are mounted on a non-conducting panel
  • C.the resistor banks are composed of individual series-connected units
  • D.the auxiliary contacts have a high resistance connection
5 单选题 1分
Remote control means that ______.
  • A. the system is manned manually
  • B. the system is controlled automatically
  • C. the system is situated remotely from the operator
  • D. all the above
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