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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 1/(1-S)
 1-S
 S
 1/S

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

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

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

  1435.
 1440.
 1450.
 1500.

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 copper loss
 mechanical loss
 both A and B
 iron loss

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing any two leads from slip rings.
  transposing all the three leads from the supply.
  disconnecting any one phase.
  transposing any two leads from supply.

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Electrical Machines
Transformer oil is used as

 an insulator.
 a coolant.
 both A and B.
 inert medium.

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