Control of Electric Drives MCQs with answers Page - 4

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A

Admin • 617.67K Points
Coach

Q. For crane travel which of the following motors is normally used ?

  • (A) Synchronous motor
  • (B) D.C. differentially compound motor
  • (C) Ward-Leonard controlled
  • (D) shunt motor

A

Admin • 617.67K Points
Coach

Q. The capacity of a crane is expressed in terms of

  • (A) type of drive
  • (B) span
  • (C) tonnes
  • (D) any of the above

A

Admin • 617.67K Points
Coach

Q. The characteristics of drive for crane hoisting and lowering are which of the following ?

  • (A) Precise control
  • (B) Smooth movement
  • (C) Fast speed control
  • (D) All of the above

A

Admin • 617.67K Points
Coach

Q. Which of the following motors is preferred for boom hoist of a travelling crane?

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

A

Admin • 617.67K Points
Coach

Q. A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is

  • (A) slop speed operation
  • (B) high starting torque
  • (C) low windage losses
  • (D) all of the above

A

Admin • 617.67K Points
Coach

Q. Which of the following motors has series characteristics ?

  • (A) Shaded pole motor
  • (B) Repulsion motor
  • (C) Capacitor start motor
  • (D) None of the above

A

Admin • 617.67K Points
Coach

Q. Which of the following happens when star-delta starter is used ?

  • (A) Starting voltage is reduced
  • (B) Starting current is reduced
  • (C) Both (A) and (B)
  • (D) None of the above

A

Admin • 617.67K Points
Coach

Q. For a D.C. shunt motor which of the following is incorrect 7

  • (A) Unsuitable for heavy duty starting
  • (B) Torque varies as armature current
  • (C) Torque-armature current is a straight line
  • (D) Torque is zero for zero armature current

A

Admin • 617.67K Points
Coach

Q. For which of the following applications motor has to start with high acceleration?

  • (A) Oil expeller
  • (B) Floor mill
  • (C) Lifts and hoists
  • (D) Centrifugal pump

A

Admin • 617.67K Points
Coach

Q. Which of the following types of motor enclosure is safest ?

  • (A) Totally enclosed
  • (B) Totally enclosed fan cooled
  • (C) Open type
  • (D) Semi closed

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