Control of Electric Drives MCQs with answers Page - 23

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Q. A synchronous motor is found to be more economical when the load is above

  • (A) 1 kW
  • (B) 10 kW
  • (C) 20 kW
  • (D) 100kW.

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Q. The advantage of a synchronous motor in addition to its constant speed is

  • (A) high power factor
  • (B) better efficiency
  • (C) lower cost
  • (D) all of the above.

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Q. In motor circuit static frequency changers are used for

  • (A) power factor improvement
  • (B) improved cooling
  • (C) reversal of direction
  • (D) speed regulation.

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Q. In case of traveling cranes, the motor preferred for boom hoist is

  • (A) AC slip ring motor
  • (B) Ward Leonard controlled DC shunt motor
  • (C) Synchronous motor
  • (D) Single phase motor.

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Q. The characteristics of drive for. crane hoisting and lowering is

  • (A) smooth movement
  • (B) precise control
  • (C) fast speed control
  • (D) all of the above.

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Q. The traveling speed of cranes varies from

  • (A) 1 to 2.5 m/s
  • (B) 5 to 15 m/s
  • (C) 20 to 22.5 m/s
  • (D) 25 to 40 m/s.

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Q. In overhead traveling cranes

  • (A) continuous duty motors are used
  • (B) slow speed motors are preferred
  • (C) short time rated motors arc preferred
  • (D) none of the above.

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Q. Heavy duty cranes are used in

  • (A) Heavy engineering workshops
  • (B) Steel plants
  • (C) Ore handling plants
  • (D) All of the above.

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Q. 1/2 hour rated motors are used for

  • (A) light duty cranes
  • (B) medium duty cranes
  • (C) heavy duty cranes
  • (D) none of the above.

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Q. Which of the following drive can be used for derricks and winches ?

  • (A) DC motors with Ward Leonard control
  • (B) AC slip-ring motors with variable resistance
  • (C) Pole changing squirrel cage motors
  • (D) Any of the above.

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