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Electrical Machines

Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/√3
 1/3
 3
 √3

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  stator phases of the motor.
None of these
  starting resistance in the starter.
  rotor at slip rings.

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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

 1.
 2.
 4.
  8.

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Electrical Machines
A 250 V DC generator in run at rated speed with no excitation. The open circuit voltage will be

  zero.
  250 V.
  very small, say about 2 or 3 V.
 about 100 V.

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Electrical Machines
The stator frame in an induction motor is used to

  protect the whole machine.
  provide return path for the flux.
  ventilate the armature.
  hold armature stamping in position.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 eddy-current loss
 temperature rise
 mechanical loss
 hysteresis loss

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MORE MCQ ON Electrical Machines

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