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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 50Hz
 1 Hz
 2.5Hz
 2HZ

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 remains same.
None of these
 increases.
 decreases.

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

 0.9 lag
 unity
 0.2 lag
 0.2 lead

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 600
 60
 40
 660

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 an induction generator
None of these
 a synchronous motor
 an induction motor

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Electrical Machines
In DC generator, the electricity produced in armature is

  DC.
  armature is not present in DC generator.
None of these
  AC.

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