Control of Electric Drives MCQs with answers Page - 6

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A

Admin • 617.67K Points
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Q. Light duty cranes are generally used in

  • (A) Power houses
  • (B) Pumping stations
  • (C) Auto mobile workshops
  • (D) All of the above

A

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Q. The range of ratings of electric motor used for rolling mills is of the order of

  • (A) 10 to 25 kW
  • (B) 25 to 85 kW
  • (C) 85 to 400 kW
  • (D) 400 to 1000 kW

A

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Q. When an electric train is moving down a hill the DC motor operates as a DC

  • (A) Series motor
  • (B) Series generator
  • (C) Shunt motor
  • (D) Shunt generator

A

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Q. Speed controlled by variation of field flux results in

  • (A) Constant power Drive
  • (B) Variable power Drive
  • (C) Constant torture Drive
  • (D) Variable torque Drive

A

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Q. The slip power recovery scheme is used in induction motor for speed control in the range

  • (A) Above synchronous speed
  • (B) Below synchronous speed
  • (C) Both above and below synchronous speed
  • (D) None of the above

A

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Q. The pair used for frequency converter is

  • (A) Squirrel cage induction motor and synchronous motor
  • (B) Sleep ring induction motor and a synchronous motor
  • (C) Sleep ring induction motor and squirrel cage induction motor
  • (D) All of the above

A

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Q. The motor in close are used for collieries, chemical plant is

  • (A) Flame proof type
  • (B) Splash proof type
  • (C) Totally enclosed type
  • (D) Pipe ventilated type

A

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Q. The motor enclosure used in wood-working industry is

  • (A) Protected type
  • (B) Totally enclosed fan cooled type
  • (C) Flame proof type
  • (D) Splash proof type

A

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Q. The motor enclosure used for industrial purposes is

  • (A) Protected type
  • (B) Drip proof type
  • (C) Totally enclosed type
  • (D) Open type

A

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Q. Ball-bearings are

  • (A) Used up to 75 kW motors
  • (B) Of long life and low friction loss
  • (C) Costlier and noisy particularly at high speed motor
  • (D) All of the above

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