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Electrical Machines

Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 1
 0 < S < 2
 -2 < S < 2
 -1 < S < 1

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = 1.
  E1 / E2 = N1 / N2.

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

 None of above.
 Remains unchanged.
  Increases.
 Decreases.

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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

 rotates opposite direction
 rotates same direction
None of these
 stationary

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the electrical resistivity of iron.
  increases the hysteresis loss.
None of these
  reduces the saturation magnetization.

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Electrical Machines
The full load copper loss and iron loss of transformer are 6400W and 5000W respectively. The copper loss and iron loss at half load will be respectively?

 1600 W and 1250 W
 1600 W and 5000 W
 3200 W and 2500 W
 3200 W and 5200 W

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