Control of Electric Drives MCQs with answers Page - 3

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A

Admin • 617.67K Points
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Q. The starting torque of a D.C. motor is independent of which of the following?

  • (A) Flux
  • (B) Armature current
  • (C) Flux and armature current
  • (D) Speed

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Q. Rotor of a motor is usually supported on bearings.

  • (A) ball or roller
  • (B) needle
  • (C) bush
  • (D) thrust

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Q. For which of the following applications D.C. motors are still preferred?

  • (A) High efficiency operation
  • (B) Reversibility
  • (C) Variable speed drive
  • (D) High starting torque

A

Admin • 617.67K Points
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Q. In a paper mill where constant speed is required

  • (A) synchronous motors are preferred
  • (B) A.C. motors are preferred
  • (C) individual drive is preferred
  • (D) group drive is preferred

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Q. A reluctance motor

  • (A) is provided with slip rings
  • (B) requires starting gear
  • (C) has high cost
  • (D) is compact

A

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Q. The travelling speed of cranes varies from

  • (A) 20 to 30 m/s
  • (B) 10 to 15 m/s
  • (C) 5 to 10 m/s
  • (D) 1 to 2.5 m/s

A

Admin • 617.67K Points
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Q. Besides a constant speed a synchronous rotor possesses which of the following advantages ?

  • (A) Lower cost
  • (B) Better efficiency
  • (C) High power factor
  • (D) All of the above

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Q. By the use of which of the followingm D.C. can be obtained from AC?

  • (A) Silicon diodes
  • (B) Mercury arc rectifier
  • (C) Motor generator set
  • (D) Any of the above

A

Admin • 617.67K Points
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Q. Which of the following motors is preferred when quick speed reversal is the main consideration?

  • (A) Squirrel cage induction motor
  • (B) Wound rotor induction motor
  • (C) Synchronous motor
  • (D) D.C. motor

A

Admin • 617.67K Points
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Q. Which ofthefollowing motors is preferred when smooth and precise speed control over a wide range is desired ?

  • (A) D.C. motor
  • (B) Squirrel cage induction motor
  • (C) Wound rotor induction motor
  • (D) Synchronous motor

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