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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 2 V
 4 V
 0 V

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1800 Watt.
  980 Watt.
  1960 Watt.
 1920 Watt.

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 load current
 supply frequency
 both 2 and 3
 maximum flux density

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

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

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 Permanent magnets.
 Both B and C.
 None of the options.
  Electromagnets.

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Electrical Machines
The crawling in the induction motor is caused by

 low voltage supply
 high loads
 harmonics developed in the motor
 improper design of stator laminations

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