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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 ______________.

  2.
 6.
  8.
 4.

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

 armature flux
 armature mmf
All of these
 armature current

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Electrical Machines
Belt conveyors offer _______________ starting torque.

  high.
  zero.
  low.
  medium.

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  It will rotates in reverse direction.
  Either short circuit or open circuit occurs.
  Fail to start.
  It will rotates in normal operation.

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Electrical Machines
At slip s = 1 torque developed in machine is

  none.
  starting torque.
  electromagnetic torque.
  maximum torque.

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Electrical Machines
Induction motors have the advantage of

  less maintenance.
  simple in construction.
  less cost.
  all of below.

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MORE MCQ ON Electrical Machines

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