Control of Electric Drives MCQs with answers Page - 5

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A

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Coach

Q. While selecting motor for an air conditioner which of the following characteristics is of great importance ?

  • (A) Type of bearings
  • (B) Type of enclosure
  • (C) Noise
  • (D) Arrangement for power transmis¬sion

A

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Q. The diameter of the rotor shaft for an electric motor depends on which of the following ?

  • (A) r.p.m. only
  • (B) Horse power only
  • (C) Horse power and r.p.m.
  • (D) Horse power, r.p.m. and power factor

A

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Q. Which of the following alternatives will be cheaper ?

  • (A) A 100 H.P. AC. three phase motor
  • (B) Four motors of 25 H.P. each
  • (C) Five motors of 20 H.P. each
  • (D) Ten motors of 10 H.P. each

A

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Q. The cost of an induction motor will increase as

  • (A) horsepower rating increases but r.p.m. decreases
  • (B) horsepower rating decreases but r.p.m. increases
  • (C) horsepower rating and operating speed increases
  • (D) horsepower rating and operating speed decreases

A

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Q. In series motor which of the following methods can be used for changing the flux per pole ?

  • (A) Tapped field control
  • (B) Diverter field control
  • (C) Series-parallel control
  • (D) Any of the above

A

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Q. Word Leonard controlled DC Drives are generally used for..... excavators

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

A

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Q. ......... is preferred for automatic drives

  • (A) Synchronous motors
  • (B) Word Leonard controlled DC motors
  • (C) None of the above
  • (D) Any of the above

A

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Q. The load cycle for a motor driving a power press will be .........

  • (A) Variable load
  • (B) Continuous
  • (C) Continuous but periodical
  • (D) Intermittent and variable load

A

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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 size of an excavator is usually expressed in terms of

  • (A) Crowd motion
  • (B) Angle of swing
  • (C) Cubic metres
  • (D) Travel in metres

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