Switchgear Assembly and Function Quiz
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Questions and Answers

What is the main purpose of switchgear?

  • To distribute power to customers
  • To operate at high voltages
  • To generate electrical power
  • To control and protect electrical circuits and equipment (correct)

    • Why can't a tumbler switch with an ordinary fuse be used profitably on high voltage systems?

  • It cannot interrupt large fault current successfully (correct)
  • It is not cost-effective
  • It has a time delay in blowing the fuse
  • It requires frequent replacement of the fuse

    • What problem arises when a fuse blows on high voltage systems?

  • The risk of serious damage to costly equipment (correct)
  • The cost of replacing the fuse
  • The interruption of power supply to customers
  • The inability to control domestic appliances

    • Why are automatic protective devices or switchgears required for high voltage systems?

    <p>To prevent damage to electrical equipment from heavy currents during short circuits</p> Signup and view all the answers

    What is the key disadvantage of using a tumbler switch with an ordinary fuse on high voltage systems?

    <p>Inability to interrupt large fault current successfully</p> Signup and view all the answers

    What is the primary function of a circuit breaker in an automatic protective equipment system?

    <p>To open or close an electrical circuit under normal and abnormal conditions</p> Signup and view all the answers

    Why might a circuit breaker be preferable to a fuse in certain instances?

    <p>Capable of opening and closing circuits without replacement</p> Signup and view all the answers

    What happens when heavy current flows through the primary of the current transformer (CT)?

    <p>The secondary e.m.f. induced in the CT increases</p> Signup and view all the answers

    How is an arc extinguished in a circuit breaker during opening?

    <p>By using oil, air blast, vacuum, or SF6 gas</p> Signup and view all the answers

    What is the role of the relay in an automatic protective equipment system?

    <p>To detect faults in the electrical circuit</p> Signup and view all the answers

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