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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 4 V
 2 V
 1 V
 0 V

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

All of these
 Synchronous machine
 Induction machine
 DC machine

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Electrical Machines
In a transformer which of the following losses are zero?

 Iron loss
All of these
 Rotational loss
 Copper loss

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Electrical Machines
Secondary winding of an auto transformer is also called

 compensating winding.
  common winding.
 tertiary winding.
 damping winding.

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Electrical Machines
The induction motor shaft is made of

  mild steel.
  cast iron.
  stainless steel.
  aluminium.

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Electrical Machines
Synchronous reactance of an alternator represents

 a reactance operating at synchronous speed
 armature reactance and leakage reactance
 field winding reactance
All of these

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