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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

 excitation.
 both 1 and 2.
 load angle.
 frequency.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

None of these
 4.8% and -3.2%
 3.2% and -1.6%
 6% and -4%

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 10%
 5%
 19%
 40%

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 1 - s.
 2 + s.
  s.
  2 - s.

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Electrical Machines
Universal motors are used in

 food processing
 traction
 cranes
All of these

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 decrease.
 remains constant.
None of these
 increase.

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