☰ Electrical Energy Utilisation and Electric Traction (Electrical Engineering) - MCQs

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Q19.

Ball-bearings are

  • A. used upto 75 kW motors
  • B. of long life and low friction loss
  • C. costlier and noisy particularly at high motor speed
  • D. all of the above

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Q20.

Rotor of a motor is usually protected on

  • A. blush bearings
  • B. thrust bearing
  • C. ball or roller bearings
  • D. any of the above

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Q21.

The motor enclosure used in woodworking industry is

  • A. protected type
  • B. totally enclosed fan cooled type
  • C. flameproof diet
  • D. open type

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Q22.

The motor enclosure used for industrial purposes is

  • A. protected type
  • B. totally enclosed fan cooled type
  • C. flameproof type
  • D. open type

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Q23.

Rheostatic braking may be applied to an induction motor provided

  • A. it is squirrel cage type
  • B. it is a wound type
  • C. separated DC source for field excitation is available
  • D. variable external resistance is available

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Q24.

Load torque constant at all speeds is represented by a

  • A. fan
  • B. compressor
  • C. centrifugal pump load
  • D. all of these

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