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Electrical Machines

Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 30°
 36°
 18°
 72°

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Electrical Machines
A 220 ,V 15 , kW 100 rpm shunt motor with armature resistance of 0.25 , W has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is

 18.18% increase
 36.36% decrease
 36.36% increase
 36.36% increase

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 90 V.
 30 V.
 60 V.
 40 V.

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Electrical Machines
If Kh is hysteresis constant, f is supply frequency, Bm maximum flux density in core of transformer, the expression of hysteresis loss in transformer, is given by

  KhfBm1.6.
 KhfBm3.
 KhfBm.
 Khf2Bm1.6.

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Electrical Machines
Drop in speed from no load to full load is very high in

 Cummulative compound motor with interpoles.
 Series motor with interpoles.
  Series motor without interpoles.
 Shunt motor with interpoles.

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 more magnetic core loss.
  more copper loss.
  no magnetic core loss.
 less magnetic core loss.

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