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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

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

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 220 V.
 240 V.
 150 V.
 280 V.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 series field connections.
 shunt field connections.
 armature or field connections.
 armature connections.

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 decreases
 remains unaffected
None of these
 increases

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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

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

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 about 115°.
 90°.
 0°.
  about 75°.

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