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Electrical Machines

Electrical Machines
Slip exists in

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

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

  2.67 %.
 1.5 %.
  30 %.
 5 %.

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Electrical Machines
Regenerative braking is not found in which motor?

 DC compound.
 DC shunt.
 Induction motor.
  DC series.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1920 Watt.
  980 Watt.
 1800 Watt.
  1960 Watt.

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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

 120P / N Hz.
 120N / P Hz.
  PN / 2 Hz.
 120 / PN Hz.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature voltage control.
 Armature circuit resistance control.
 Any of above.
 Field resistance control.

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