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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

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

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

 220.4 volt.
  None of these.
  218.5 volt.
  120 volt.

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Electrical Machines
From no load to full load the slip will

 not change.
 slightly decrease.
 slightly increase.
None of these

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1000 rpm
 750 rpm
 1500 rpm
 3000 rpm

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Electrical Machines
Hysteresis loss will depends on

 f1.6
 f²
 f
 f³

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Rotor mmf wave.
  Both rotor and stator winding.
  Stator winding.
  Rotor winding.

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