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Electrical Machines

Electrical Machines
From no load to full load the slip will

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

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Electrical Machines
Methods of synchronizing of alternator may be done by

 one dark two bright.
 all bright lamp method.
 all dark lamp method.
  all of these.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 133.22 N-m
 234.76 N-m.
 cant be determined.
 266.20 N-m.

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

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

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Electrical Machines
In case of a conductively compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
 In parallel with the armature winding.
  In series with the armature winding.
 As a separate unit.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lag
 0.2 lead
 0.9 lag
 unity

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