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Electrical Machines

Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  sf / 2.
  s2.
  sf.

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Series.
 none of these.
 Compound (cummolative).
  Shunt.

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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
Slip exists in

  induction motor.
  none of above.
  in both machines.
  synchronous motor.

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Electrical Machines
Crawling in an induction motor is due to

  time harmonics in supply.
  insufficient starting torque.
  slip ring rotor.
  space harmonics produced by winding currents.

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/ 4Sa
 PZL/4Sa²
 PZL/4Sp²
 PZL/4S

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