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Electrical Machines

Electrical Machines
Stepper motor is used in

 food processing
 computer printers
All of these
 traction

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Electrical Machines
A generator may loose residual magnetism due to

  heating.
  any of these.
  over excitation.
  vibrations.

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 1.
 2.
 4.
  8.

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Electrical Machines
Hopkinss test in DC motor is conducted at ?

 None of these.
 Low load.
 No load.
  Full load.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

 mechanical rotatory system.
 damping torque.
  restoring torque.
 synchronizing power co efficient.

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Electrical Machines
In speed control of DC shunt motor by varying field flux, what may be the value of field regulator?

 0.2 ohm
 2 ohm.
 10 ohm
 100 ohm

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MORE MCQ ON Electrical Machines

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