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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 1 Hz
 2.5Hz
 50Hz

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

  240 rpm.
 450 rpm.
  470 rpm.
 540 rpm.

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 both A and B
 below rated speed
None of these

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

All of these
 In order to get more flux.
 In order to not to get saturated.
 In order to get saturated.

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Electrical Machines
Commonly used starters of cage motor is

None of these
  DOL.
  both A and B.
  star delta.

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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?

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

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