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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd < Xq.
 Xd = Xq.
None of these
 Xd > Xq.

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Electrical Machines
A 5 KVA transformer has a turns ratio of N1/N2 = 10. The impedance of primary winding is 3+j5 ohms while that of secondary winding is 0.5+j0.8 ohms. The impedance of transformer when referred to primary will be

 8+j13 ohms
 53+j85 ohms
 3.5+j5.8 ohms
 3.05+j5.08 ohms

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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

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

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 0 V.
 20 V.
 60 V.
 40 V.

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Electrical Machines
In an ideal DC generator the regulation is

 zero.
 positive.
 low.
 high.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 Ns
 S.Ns
 Zero

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