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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 zero
 unity
 lagging
 leading

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 to earth.
 to an AC source.
  to a DC source.
 in reverse.

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

 14.28%.
  16.67%.
 15.30%.
 18.25%.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

None of these
 increase
 not changed
 decrease

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  720 to 920.
  500 to 720.
  1440 to 2880.

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Electrical Machines
DC shunt motors are suitable for

 Centrifugal pumps
  All of this.
 Lathes.
 Blowers and fans.

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MORE MCQ ON Electrical Machines

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