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Electrical Machines

Electrical Machines
Voltage regulation of transformer is given by

 (V2 - E2) / V2
 (E2 - V2) / E2
 (V2 - E2) / E2
 (E2 - V2) / V2

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 500.
 1000.
 2000.
 0.

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Electrical Machines
In double cage induction motor, the outer cage offers

  high resistance and high reactance.
  high resistance and low reactance.
  low resistance and high reactance.
  low resistance and low reactance.

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Electrical Machines
Rotating part of DC motor is known as

 Carbone brush.
 Pole.
 Starter.
 Armature.

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Electrical Machines
Sparkless commutation can be achieved by employing

  any one or more of the above methods.
  high resistance carbon brushes.
  inter poles.
 compensating winding.

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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?

 both A and B
None of these
 K × input power
 (1-K) × input power

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