轮机英语【轮机长】题库

单选题 1分

The meat box temperature control circuit, as used in the ship service refrigeration system, is an ex...

The meat box temperature control circuit, as used in the ship service refrigeration system, is an example of _________.
  • A. two position control
  • B. single speed floating control
  • C. proportional control
  • D. reset control
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1 单选题 1分
The amount of voltage induced in the windings of an AC generator depends on _____.
  • A. the number of conductors in series per winding
  • B. the speed at which the magnetic field passes across the winding
  • C. the strength of the magnetic field
  • D. all of the above
2 单选题 1分
Voltage generated by most AC generators is fed from the machine to the bus by means of ____.
  • A. brushes on a commutator
  • B. brushes on slip rings
  • C. slip rings on a commutator
  • D. direct connections from the stator
3 单选题 1分
In a modern three-phase A.C. synchronous brushes generator, the excitation winding is on the rotor. That means________.
  • A. The generator need not excitation.
  • B. There are three phase winding on the rotor
  • C. The winding on the rotor is for inputting excitation current
  • D. The generator has brushes
4 单选题 1分
Which of the following components are used to convert alternating current produced in the generator windings to direct current?
  • A. Armature and equalizer
  • B. Commutator and brushes
  • C. Rotor and interpoles
  • D. Field and exciter
5 单选题 1分
The purpose of DC generator brushes is to ____.
  • A. neutralize armature reaction
  • B. conduct electric current to an outside circuit
  • C. convert DC current to AC current
  • D. provide excitation to a DC generator
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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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