Control of Electric Drives MCQs with answers Page - 24

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Q. The number of sets used in pole changing type squirrel cage motors for derricks and winches, is

  • (A) 2
  • (B) 3
  • (C) 4
  • (D) 6.

A

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Q. A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the medium speed is used for

  • (A) lifting
  • (B) hoisting
  • (C) lowering
  • (D) landing the load.

A

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Q. A pole changing type squirrel cage motor used in derricks has four, eight and twenty four poles. In this the lowest speed is used for

  • (A) lifting
  • (B) hoisting
  • (C) lowering
  • (D) landing the load.

A

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Q. The range of horse power of electric motor drives for rolling mills is of the order of

  • (A) 1 to 10 HP
  • (B) 15 to 25 HP
  • (C) 50 to 100 HP
  • (D) 100 to 500 HP.

A

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Q. Motors preferred for rolling mill drive is

  • (A) dc motors
  • (B) ac slip ring motors with speed control
  • (C) any of the above
  • (D) none of the above.

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