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Electrical Machines

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?

 2000W
 1450W
 1920W
 1820W

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 a synchronous motor
 an induction generator
 an induction motor
None of these

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 decreases
 remains unaffected
 any of the above
 increases

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Oscillate around the normal speed.
  Remain unaltered.
  Increase.
  Reduce.

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Electrical Machines
When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

 induction motor.
 DC motor.
 switched reluctance motor.
 variable reluctance motor.

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

 225 V.
 230 V.
 220 V.
  222 V.

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