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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

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

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 40 - 400 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

  Increase by 5%.
 Reduce by 5%.
 Remain unchanged.
 Depends on other factor.

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Electrical Machines
Which single phase motor is used for a refrigerator?

  Repulsion.
  Capacitor run.
  Split phase.
  Universal.

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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

 2.57 %.
 2.56 %.
 3.76%.
 4.76%.

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Electrical Machines
Width of a carbon brush should be equal to

 the width of the 1 to 2 commutator segment.
 the width of the 2 to 3 commutator segment.
 less than the width of commutator segment.
 the width more than 3 commutator segment.

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