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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 infinite value
 0
 finite value
 1

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Electrical Machines
From no load to full load the slip will

 slightly decrease.
 not change.
None of these
 slightly increase.

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Electrical Machines
In double cage induction motor, the outer cage offers

  high resistance and low reactance.
  high resistance and high reactance.
  low resistance and low reactance.
  low resistance and high reactance.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 unity power factor
All of these
 leading power factor
 lagging power factor

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

  the use equalizer in lap winding.
 the use of compensating winding.
 the use drum winding.
 reactance voltage produced due to communication.

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  any of the above.
  under commutation.
  too rapid reversal of current.
 over commutation.

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MORE MCQ ON Electrical Machines

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