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Electrical Machines

Electrical Machines
The emf induced in the dc generator armature winding is

 AC
None of these
 AC and DC
 DC

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Electrical Machines
Speed of DC motor can be controlled by varying

 applied voltage.
 resistance of armature culture.
 all of these.
 its flux oer pole.

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Electrical Machines
At slip s = 1 torque developed in machine is

  starting torque.
  maximum torque.
  electromagnetic torque.
  none.

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Electrical Machines
The function of field regulator in a DC compound motor is to

 control field current.
 limit the armature current.
 vary the armature resistance.
 none of above.

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Electrical Machines
A 3 - Φ, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?

 35 Hz.
  Can be determined.
  30 Hz.
 20 Hz.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 changes.
 same.
 none of above.
 different.

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MORE MCQ ON Electrical Machines

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