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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
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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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
None of these
 DC.
 both of above.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to the square of armature current.
 Proportional to armature current.
 Inversely proportional to armature current.
  Constant.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of turbo alternator.
  none of these.
 equal to that of the effective length of the line.
 greater than that of hydro generator.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3000 rpm.
  600 rpm.
  500 rpm.
  3600 rpm.

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