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Electrical Machines

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

 1/S
 S
 1/(1-S)
 1-S

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imax.
 Vmin to Imin.
 Vmax to Imax.
 Vmax to Imin.

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

 35 Hz.
  Can be determined.
  30 Hz.
 20 Hz.

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

  to suppress harmonic and unbalance in voltage.
 to carry extra load.
None of these
 to interconnect three voltage systems.

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Electrical Machines
For high current and low current rating which winding is employed to DC machine?

 Lap winding
 None of above
 Both lap and wave winding
 Wave winding

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Electrical Machines
Slip exists in

  none of above.
  in both machines.
  synchronous motor.
  induction motor.

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