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Electrical Machines

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

  EbIa2.
  EIa.
  EbIa.
  none of these.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 20 volts.
 40 volts.
 30 volts.
 10 volts.

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Electrical Machines
In DC machine torque depends on which of the following?

 flux (φ)
 speed
 armature current (I)
 both A and B

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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 ___________.

  30 %.
 5 %.
  2.67 %.
 1.5 %.

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Electrical Machines
The back emf produced in a dc motor depends on

  P and Z.
  none of these.
  P.
  Z.

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 reduce the saturation in the interpole
 economise on the material required for interpoles and their windings
 reduce the overall weight
 increase the acceleration of commutation

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