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Electrical Machines

Electrical Machines
The emf induced in the dc generator armature winding is

 DC
 AC and DC
 AC
None of these

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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.

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

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 1 Hz
 5 Hz
 50 Hz

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed falls.
 deteriorate and the speed rises.
 deteriorate and the speed falls.
 improve and the speed rises.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Supply voltage.
  Armature current.
  Field excitaion.
  Armature voltage.

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Electrical Machines
High starting torque and low starting current is the advantage of

  slip ring induction motor.
  stepper motor.
  squirrel cage induction motor.
  hysteresis motor.

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