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Electrical Machines

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

 any of the above
 hyperbola
 linearised
 parabola

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

 either increase or decrease
None of these
 increase
 decrease

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Electrical Machines
The power input to a 3 - φ induction motor is 60 kW and stator loss is 1 kW the rotor cu loss per phase is

 1.
  slip X 50 / 3.
  slip X 69 / 3.
  slip X 59 / 3.

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 50 W
 168.75 W
 112.5 W
 75 W

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Electrical Machines
Which of the following is the largest conversion device?

 Synchronous machine
 Induction machine
All of these
 DC machine

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Electrical Machines
Synchronising power of a synchronous motor varies

All of these
 directly as synchronous reactances Xs
 directly as Xs2
 inversely as 1/Xs

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