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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
 0 V
 2 V
 1 V

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Electrical Machines
Induction motors have the advantage of

  all of below.
  less cost.
  simple in construction.
  less maintenance.

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Electrical Machines
For a fault at the terminal of a synchronous generator, the fault current is maximum for a

 line to line fault.
 3 - phase fault.
 3 - phase to ground fault.
  line to ground fault.

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Electrical Machines
A motor operates in stable region at which of the following slip?

 low slip region
 unity slip
 high slip region
 both 1 and 2

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

All of these
 increases hysteresis loss.
 makes the material brittle.
 Increases cost.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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