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Electrical Machines

Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 10 Hz.
  2 Hz.
  3 Hz.
 50 Hz.

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 remains unaffected
 increases
 decreases
None of these

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

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

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Triangular and directed towards brush axis.
 Saddle shape.
 Triangular and directed towards main pole.
 Peaky in nature.

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

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

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

 0 V
 1 V
 4 V
 2 V

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