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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.9 lag
 unity
 0.2 lag
 0.2 lead

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

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

  DC of slip frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.
 DC.
 AC of supply frequency.

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Electrical Machines
Hunting in a synchronous motor takes place

  when power factor is unity.
  motor is under loaded.
  when load varies.
  when supply voltage fluctuates.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = 2*ωm
 ωe = 4*ωm
 ωe = 1/2*ωm
 ωe = ωm

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Electrical Machines
Hunting phenomenon is observed in which motor?

 DC motor.
  Synchronous motor.
 Induction motor.
 Both A and C.

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