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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 0 V
 2 V
 4 V
 1 V

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

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Electrical Machines
The overall power factor of an on load transformer

  depends on the power factor of the load.
 is always unity.
 is always lagging.
 is always leading.

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Electrical Machines
In DC machines shape of net flux density is?

 saddle shape
 sine wave
 flat tapped or trapezoidal
 peaky in nature

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Electrical Machines
Stray losses in transformer occurs in

 paper insulation in transformers.
 transformer insulating oil.
  winding conductors and steel structures of transformer.
 steel core.

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Electrical Machines
In applied voltage is reduced in a dc shunt motor

 Full load torque.
 None of these.
  Full load current.
 Full load speed.

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