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Electrical Machines

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

 1 Hz
 50Hz
 2.5Hz
 2HZ

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 increases with increase in the load torque.
 remains constant.
 decreases with decrease in the load torque.
 decreases with increase in the load torque.

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Electrical Machines
The output power of a dc motor is given by

  EbIa2.
  EbIa.
  EIa.
  none of these.

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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is

 7%.
  8.9%.
 0%.
 14%.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 changes.
 same.
 different.
 none of above.

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Electrical Machines
Stepper motor is used in

 computer printers
All of these
 food processing
 traction

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