Control of Electric Drives MCQs with answers Page - 7

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A

Admin • 833K Points
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Q. Sleeve bearings

  • (A) Are normally of bronze
  • (B) Have self lubricating properties
  • (C) Are used where noise is to be avoided
  • (D) All of the above

A

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Q. Hot bearings of a DC motor may be caused by

  • (A) Poor ventilation
  • (B) Incorrect voltage
  • (C) Loose coupling
  • (D) Lack of or dirty lubricant

A

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Q. The least expensive drive is

  • (A) Belt drive
  • (B) Rope drive
  • (C) Chain drive
  • (D) Any of the above

A

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Q. For very high speed ratio the indispensable drive is

  • (A) Direct drive
  • (B) Rope Drive
  • (C) Chain drive
  • (D) Any of the above

A

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Q. 15 minute rated motors are suitable for

  • (A) Light duty cranes
  • (B) Medium duty cranes
  • (C) Heavy duty cranes
  • (D) All of the above

A

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Q. For medium duty cranes the short time rating motor used is

  • (A) 10 minutes
  • (B) 15 minutes
  • (C) 30 minutes
  • (D) any of the above

A

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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

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

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

A

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

  • (A) Synchronous motor
  • (B) DC differential compound motor
  • (C) Ward Leonard controlled DC shunt motor
  • (D) AC slip ring motor

A

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Q. Which of the following happens when start Delta starter is used ?

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

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