轮机英语【轮机长】题库

单选题 1分

On routine daily inspection you notice that there is a light arching between an alternator’s carbon ...

On routine daily inspection you notice that there is a light arching between an alternator’s carbon brushes and rotor sliprings, with alternator operating at 70% load. Should you_______.
  • A. Increase the tension on the brushes
  • B. Reverse the polarity of the excitation voltage at the brush holder connection
  • C. Move the position of the brushes around the sliprings to find the correct neutral position
  • D. Check the surface of the sliprings, polish if necessary and bed in the brushes
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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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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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