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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

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

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Electrical Machines
In electric locomotives which of the following motor are used ?

 Synchronous motor.
 DC Shunt motor.
 DC series motor.
 DC compound motor.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 less than 30 W
 zero watt
 30 W
 more than 30 W

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 proportionate to MVA rating of transformers.
 inversely proportional to MVA rating of transformers.
 such that actual impedance of all transformers would be same.
  same.

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

 increase
 decrease
 either increase or decrease
None of these

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

None of these
 On armature.
  On yoke in the pole faces.
 On yoke in the inter pole gap.

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