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Electrical Machines

Electrical Machines
In an induction motor, the no-load slip is generally equal to

  zero.
 4 %.
 1.5 %.
  less than 1 %.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the chance of cogging.
  increase the starting torque.
  reduce the magnetizing current.
  reduce the chance of crawling.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

  increased.
 kept constant to certain value.
 remains same.
 decreased.

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Electrical Machines
Series booster is a

 separately excited DC generator.
 shunt wound DC generator.
 permanent magnet DC generator.
  series wound DC generator.

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  in none of above positions.
  along neutral axis.
  along field axis.
  in any of above positions.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 3.2% and -1.6%
None of these
 4.8% and -3.2%
 6% and -4%

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MORE MCQ ON Electrical Machines

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