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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P.
  Z.
  none of these.
  P and Z.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very low.
 Zero.
 Normal.
 Very high.

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

 10 Ω.
  4 Ω.
  2 Ω.
 8 Ω.

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  decreasing of frequency.
  increasing of frequency.
  increasing number of poles.
  speed can not be increased.

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Electrical Machines
Ward Leonard control is provides speed control

  In one direction only.
  Below rated speed.
  Above rated speed.
  In both direction.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Field resistance control.
 Armature voltage control.
 Armature circuit resistance control.
 Any of above.

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