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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 0 V
 1 V
 4 V

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  only armature terminals are reversed.
  only field terminals are changed.
  none of above.
  either field terminals are reversed or armature terminals are reversed.

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Electrical Machines
Regenerative braking is possible in

 DC series motor.
  DC shunt motor with field weakening control.
 DC compound motor.
 DC shunt motor with armature resistance control.

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Electrical Machines
A 3 - Φ slip ring motor has

  double cage rotor.
  any of the above.
  short-circuited rotor.
  wound rotor.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 399 V.
 50 V.
  230.2 V.
 100 V.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Zero
 Ns
 S.Ns
 Nr

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