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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

 Blowers and fans.
  All of this.
 Centrifugal pumps
 Lathes.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf / 2.
  sf.
  f / s.
  s2.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 saddle shape
 flat tapped or trapezoidal
 triangular
 peaky in nature

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 plugging.
 locking.
 crawling.
 cogging.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 smoother acceleration.
 reduced starting current.
 more starting torque.
 more starting time.

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Eddy current loss.
 Stray loss.
 Hysteresis loss.
 Copper loss.

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MORE MCQ ON Electrical Machines

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