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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 200 V.
 115 V.
 230 V.
 460 V.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

  15 %.
  2.5 %.
 10 %.
  20 %.

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Electrical Machines
Direct axis reactance is defined as the ratio of

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

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Electrical Machines
A DC series motor has which of the following characteristics?

 Can be started easily without load.
 Has a almost constant speed.
 Has a poor torque.
 Has its field winding consinting of thick wire and less no of turns.

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Electrical Machines
Which of the following induction motor has maximum speed?

  2 pole.
 6 pole.
 4 pole.
 8 pole.

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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%.
 2.56 %.
 4.76%.
 2.57 %.

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