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Electrical Machines

Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.08 pu.
 0.01 pu.
  0.02 pu.
 0.16 pu.

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Electrical Machines
Armature reaction depends on which of the following?

None of these
 both 1 and 2
 magnitude of load current
 power factor of load

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  transformer with short-circuited secondary.
  capacitor run IM.
  synchronous motor.
  repulsion motor type starting.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 makes the material brittle.
All of these
 increases hysteresis loss.
 Increases cost.

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Eddy current losses
 Friction and windage losses
 All of the them
 Hysteresis losses

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 6 / 7.
  4 / 5.
 5 / 6.
 2 / 3.

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