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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and low
 low and high
 high and low
 high and high

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

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

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of supply voltage.
  Change of number of pole.
  Change of rotor resistance.
  Change of supply frequency.

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 15 %.
 25 %.
 50 %.
  10 %.

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Electrical Machines
Ward Leonard control provides speed control

 above rated speed.
 below rated speed.
 in one direction only.
 in both direction.

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase efficiency under light load conditions
 Increase in reliability
 continuity supply is maintained
All of these

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