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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 40W
 80W
 60W
 100W

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Electrical Machines
The shaft of induction motor should be

  any of these.
  hollow.
  flexible.
  stiff.

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 300 V.
  223.V.
 200 V.
 150 V.

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 torque but not the voltage
 neither the voltage nor the torque
 both the torque and voltage
 voltage but not the torque

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 200 V.
 230 V.
 115 V.
 460 V.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 6 / 7.
 2 / 3.
 5 / 6.
  4 / 5.

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