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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

 cross magnetization
All of these
 magnetization
 demagnetization

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 600
 40
 60
 660

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Rotor mmf wave.
  Rotor winding.
  Both rotor and stator winding.
  Stator winding.

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 motor will attain dangerously high speed
 armature current will drop
 armature will oscillate about original speed as the mean speed
 motor will become slow.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 iron made tank of transformer.
 winding of transformer.
 steel core in transformer.
 transformer insulating oil.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

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

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