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Electrical Machines

Electrical Machines
The torque speed characteristics of a AC servomotor is approximately

 any of the above
 linearised
 hyperbola
 parabola

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

  0.905.
 20.
 1.1.
  0.05.

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Electrical Machines
Which of the following motors has low ratings only?

 Capacitor start
 Shaded pole
 Capacitor run
 Resistance split phase

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide overload protection.
 limit the starting current to a safer value.
 all of above.
 provide protection against Low-Voltage.

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

 Series.
  Shunt.
 Differntical compound.
 Cummulative compound.

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Electrical Machines
Field weakening method is also called as-----------?

 constant power control
 constant torque control
 constant voltage control
 constant current control

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