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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 lagging
 leading
 zero
 unity

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Commutating pole winding.
 Auxiliary winding.
 Both Compensating and Commutating pole winding.
 Compensating winding.

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

  270.
 180.
 45.
 30.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 KefKf2Bm2.
 Kef2Kf2Bm.
  Kef2Kf2Bm2.
 Kef2KfBm2.

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 0 V
 1 V
 4 V

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  negative sequence current.
  all of these.
  less heating of the rotor.

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