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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 36°
 18°
 30°
 72°

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 any of the above
 full load
 no load
 half load

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Electrical Machines
DC shunt motors are suitable for

 Centrifugal pumps
 Lathes.
  All of this.
 Blowers and fans.

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Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 45.
 180.
  270.
 30.

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 30 W.
 28 W.
 25 W.

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