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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
Drop in speed from no load to full load is very high in

  Series motor without interpoles.
 Cummulative compound motor with interpoles.
 Shunt motor with interpoles.
 Series motor with interpoles.

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 10 Ω
 0.1 Ω
 50 Ω
 100 Ω

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce mechanical losses.
  to provide better flux linkage.
  to reduce hysteresis loss.
  to reduce eddy current loss.

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Electrical Machines
Eddy current loss will depends on

 Flux density
All of these
 Frequency
 Thickness

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  synchronous motor torque.
  DC motor torque.
  induction motor torque.
  induction generator torque.

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MORE MCQ ON Electrical Machines

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