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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 40 A.
 44 A.
 440 A.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use drum winding.
 reactance voltage produced due to communication.
 the use of compensating winding.
  the use equalizer in lap winding.

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Electrical Machines
Eddy current loss will depends on

 Frequency
 Flux density
All of these
 Thickness

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Electrical Machines
For high current and low current rating which winding is employed to DC machine?

 Lap winding
 Both lap and wave winding
 Wave winding
 None of above

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 25 kW.
 26.21 kW.
 23.06 kW.
 24.11 kW.

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Electrical Machines
High starting torque and low starting current is the advantage of

  squirrel cage induction motor.
  stepper motor.
  hysteresis motor.
  slip ring induction motor.

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MORE MCQ ON Electrical Machines

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