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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.05.
  1.0.
  0.5.
  0.1.

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Electrical Machines
A small air gap in poly phase induction motor helps to

 reduce chance of cogging.
 increase starting torque.
 reduce chance of crawling.
  reduce magnetizing current.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 food mixers
 personal computers as cooling fan
 tape recorders
 wet grinders

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Normal.
 Very high.
 Zero.
 Very low.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 10
 50
 1
 100

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Electrical Machines
Slip rings of an induction motors are made of

  phosphor bronze.
  carbon.
  aluminium.
  stainless steel.

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MORE MCQ ON Electrical Machines

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