Control of Electric Drives MCQs with answers Page - 9

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Q. A motor of less than full load power rating can be used if the load is

  • (A) continuous duty
  • (B) short time duty
  • (C) intermittent periodic duty
  • (D) none of these.

A

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Q. Pole changing method of speed control is used in

  • (A) slip ring induction motor
  • (B) dc shunt motor
  • (C) dc series motor
  • (D) squirrel cage induction motor.

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Q. To save the energy during braking

  • (A) dynamic braking is used
  • (B) plugging is used
  • (C) regenerative braking is used
  • (D) mechanical braking is used.

A

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Q. To get speed higher than the base speed of the dc shunt motor

  • (A) armature resistance control is used
  • (B) field resistance control is used
  • (C) armature voltage control is used
  • (D) none of these.

A

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Q. Rotor resistance speed control is used in

  • (A) squirrel cage induction motor
  • (B) synchronous motor
  • (C) slip ring induction motor
  • (D) dc shunt motor.

A

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Q. Effect of friction torque is more pronounced

  • (A) when the drive is running on full speed
  • (B) when the drive is being started
  • (C) when the drive is being stopped
  • (D) when the drive at half of its normal speed.

A

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Q. The equilibrium speed of a motor load system is obtained

  • (A) when motor torque equals the load torque
  • (B) when motor torque is less than the load torque
  • (C) when motor torque is more than the load torque
  • (D) none of the these.

A

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Q. Most commonly used ac motor is

  • (A) Synchronous motor
  • (B) Slip ring induction motor
  • (C) Squirrel cage induction motor
  • (D) ac commutator induction motor.

A

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Q. The motor commonly used in computers and digital systems is

  • (A) dc shunt motor
  • (B) Induction motor
  • (C) Stepper motor
  • (D) Synchronous motor.

A

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Q. Regenerative braking mode can be achieved in which quadrant (V-I curve)?

  • (A) Third
  • (B) Second
  • (C) Fourth
  • (D) First

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