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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmin to Imax.
 Vmax to Imax.
 Vmin to Imin.
 Vmax to Imin.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 sinδ
 cos2δ
 cosδ

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 motor will not run.
 it will run in same direction.
 it will run in opposite direction.
 it will run in same direction by slowly.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 2/√5
 1/√5
 1/3
 1/√2

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Electrical Machines
Regenerative braking is not found in which motor?

 DC compound.
  DC series.
 DC shunt.
 Induction motor.

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Electrical Machines
Voltage regulation of transformer is given by

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

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