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Electrical Machines

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

  f / s.
  s2.
  sf.
  sf / 2.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

 It will remain the same.
  It will be halved.
  It will be doubled.
  It will becomes four times.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  either (B) or (C).
  unequal to number of rotor slots and skewed in shape.
  an integral multiple of number of rotor slots.
  equal to number of rotor slots.

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

  slip X 69 / 3.
  slip X 50 / 3.
 1.
  slip X 59 / 3.

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

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

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 0.
 2000.
 500.
 1000.

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