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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.5.
  1.0.
  0.05.

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

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Electrical Machines
Capacitor start capacitor run provides

  high staring torque only.
  high power factor only.
  none.
  high staring torque and high power factor.

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

 either increase or decrease
None of these
 decrease
 increase

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Electrical Machines
The material used for commutator brushes is mostly

  carbon.
 cast iron.
 mica.
 copper.

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Electrical Machines
Induction motor operation depends on

 either of these.
None of these
 rotating magnetic field.
 stationary magnetic field.

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