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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

 600 W
 650 W
 625 W
 700 W

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1450.
  1435.
 1500.
 1440.

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Electrical Machines
The working principle of transformer depends on

 Newtons law.
 Faradays law of electromagnetic induction.
 Amperes law.
 Coulombs law.

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Electrical Machines
The DC compound motors are generally

 Differentical compound.
 Cummulative compound.
 None of these.
 Level Compound.

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Electrical Machines
An IM cannot run at synchronous speed because

  none of above.
  air friction will prevent it.
  rotor torque will not be produced.
  induction motor will become synchronous motor.

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -1 < S < 1
 0 < S < 1
 0 < S < 2
 -2 < S < 2

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