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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

None of these
  pole faces.
  rotor shaft.
  stator frame.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 armature winding
 interpole winding
 interpole and compensating windings together
 field winding

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Electrical Machines
For a DC machine having P no of pole pairs Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for lap-winding ?

 PZL/ 4Sa
 PZL/4Sa²
 PZL/4SP²
 PZL/4S

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 remains same.
 decreased.
  increased.
 kept constant to certain value.

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Electrical Machines
Direct axis reactance is defined as the ratio of

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

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Electrical Machines
Rotating part of DC motor is known as

 Pole.
 Starter.
 Carbone brush.
 Armature.

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MORE MCQ ON Electrical Machines

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