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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

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

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 Increase.
 Remains same.
 None of these.
  Decrease.

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

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
 DC.
 both of above.
None of these

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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?

 15.30%.
 18.25%.
  16.67%.
 14.28%.

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Electrical Machines
For same HP rating and full load speed which of following motor has poor starting torque?

 Shunt.
 Cummulative compound.
 Differently compounded.
 Series.

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MORE MCQ ON Electrical Machines

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