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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 ______________.

  8.
 6.
  2.
 4.

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Electrical Machines
The rotor speed of an induction motor is given by

  Ns = 120f /p × ( 1 - r).
  Ns = 120f / p × ( 1 - s ).
  Nr = 120f / p × (1-s).
None of these

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

  2.67 %.
  30 %.
 5 %.
 1.5 %.

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 4.76%.
 3.76%.
 2.56 %.
 2.57 %.

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

  8.
 4.
 1.
 2.

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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

None of these
 stationary
 rotates same direction
 rotates opposite direction

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