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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  0.05.
  0.5.
  1.0.

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

 1920W
 2000W
 1450W
 1820W

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  none of above.
  cross-magnetisation.
  cross-magnetization as well as demagnetization.
 demagnetisation.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor start.
  Capacitor run.
  Split phase.
  Shaded pole.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3.33%
 -3%
 +3%
 +3.33%

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  over compounded.
  under-compounded.
  differential compounded.
  shunt.

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