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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 625 W
 650 W
 600 W
 700 W

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 f2
 V
 V2
 f

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Electrical Machines
The reduced air gap results in an increase

  breaking torque.
  cost of operation.
  power factor.
  starting torque.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

 440 volt.
 230 volt.
 240 volt.
  220 volt.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

 3.2% and -1.6%
 6% and -4%
 4.8% and -3.2%
None of these

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 2
 3 or 4
 1
 0

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