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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 70° to 85°
 25° to 30°
 90°
 0°

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

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

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using the magnetic core of low reluctance.
 using transformer oil of better quality.
 increasing the number of turns.
 using soft material for winding.

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Decreases.
 Remains unchanged.
 None of above.
  Increases.

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Electrical Machines
The slip of an induction motor normally does not depend on

  core loss component.
  rotor speed.
  synchronous speed.
  shaft torque.

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Electrical Machines
If in a sub – station there is one 132 / 33 kV transformer whose secondary is connected with primary of one 33 / 11 kV transformer, the total transformation ratio of the sub – station will be,

  12.
 3.
 7.
 4.

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