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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P and Z.
  none of these.
  P.
  Z.

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Electrical Machines
The current drawn by the armature of DC motor is directly proportional to

 The voltage across the terminals.
 None of above.
 The speed of motor.
 The torque required.

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Electrical Machines
Capacitor in split phase induction motor is used to

 improve the starting torque.
 start the motor.
 improve the power factor.
 reduce the harmonics.

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 Fmax.
  (3/2)Fmax.
 (1/2)Fmax.
 3Fmax.

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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?

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

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Electrical Machines
The field system of an alternator is usually excited

  250 / 250 V DC.
  230 V AC.
  110 / 220 V AC.
  3 - Φ, 50 Hz and 400 V.

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