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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 4.
 6.
  2.
  8.

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Electrical Machines
At stand still condition the value of slip is

 infinite value
 finite value
 1
 0

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 series with armature
 series with main poles
 parallel with main poles
 parallel with armature

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Electrical Machines
A smaller air gap in a induction motor helps to

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

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 660
 600
 40
 60

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable load.
  variable supply voltage.
  variable frequency.
  windage friction.

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MORE MCQ ON Electrical Machines

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