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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.
 20.
  0.05.
 1.1.

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Electrical Machines
In DC generator, full form of MNA is what?

  Magnetic neutral axis.
 Magnetic no-load axis.
 Magnetic neutral armature co-ordinate.
 Magnetically no-load armature co-ordinate.

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Electrical Machines
Poles of DC machine are often laminated to

 reduce armature reaction.
 reduce iron weight.
 dissipate more heat.
 reduce pulsation loss.

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

  1435.
 1500.
 1450.
 1440.

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Electrical Machines
Which of the following will vary the maximum torque?

 rotor resistance R
 rotor reactance X
None of these
 both 1 and 2

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

 decrease
 either increase or decrease
 increase
None of these

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