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Electrical Machines

Electrical Machines
Stepper motor is used in

 computer printers
All of these
 food processing
 traction

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Electrical Machines
The armature reaction mmf in a DC machines has a form of

  triangular.
 sinusoidal.
 rectangular.
 trapezoidal.

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Electrical Machines
Ward Leonard control is provides speed control

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

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 not run.
 run at normal speed.
 burn.
 run at lower speed.

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Electrical Machines
The basic function of a transformer is to change

 the power factor
 the frequency
 the level of the voltage
 the power level

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 fixing the brush axis inline with the pole axis.
 increasing field excitation.
  compensating winding and commutating poles.
 shifting the brush axis from GNA to MNA.

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MORE MCQ ON Electrical Machines

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