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Electrical Machines

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

 T ∝ 1/V²
 T ∝ V
 T ∝ 1/V
 T∝ V²

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 100 V.
 800 V.
 200 V.
 400 V.

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 25° to 30°
 0°
 70° to 85°
 90°

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Oscillates around the rated speed.
 Increases.
  Decreases.
 Remains unchanged.

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 remains unaffected
None of these
 increases
 decreases

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

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