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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
 1.1.
 20.
  0.05.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ P.
 T ∝ √P.
 T2 ∝ P3.
 T is independent of P.

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Series.
 Differential compound.
  Shunt.
 Cummulative compound.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply voltage
 rotor resistance
None of these
 supply frequency

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 remains unaffected
 decreases
 increases
 any of the above

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Electrical Machines
In a transformer which of the following losses are zero?

 Rotational loss
 Copper loss
All of these
 Iron loss

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