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Electrical Machines

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

  about 75°.
 about 115°.
 90°.
 0°.

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Electrical Machines
The flux involved in the emf equation of a transformer has

  maximum value.
 total value.
 rms value.
 average value.

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Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 none of above.
 back emf is equal to twice of applied voltage.
 back emf is equal to half of applied voltage.
 back emf is equal to applied voltage.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very high speed.
 burn.
 run at very low speed.
 start haunting.

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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

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

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 3.76%.
 4.76%.
 2.57 %.
 2.56 %.

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