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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V
 T∝ V²
 T ∝ 1/V²
 T ∝ V

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 30°.
 120°.
 60°.
 90°.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor run.
  Shaded pole.
  Capacitor start.
  Split phase.

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Electrical Machines
Exciting current of an induction motor is

  lesser than power transformer.
  none of these.
  equal as power transformer.
  higher than power transformer.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iw.
 I1 = KI2 + Iμ.
 I1 = KI2.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Shunt motor.
  Differential compound motor.
  Cumulative compound motor.
  Series motor.

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