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Electrical Machines

Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  make noise.
  not run.
  get over heated.
  run normally.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Centrifugal pumps.
 Blowers.
  Conveyers.
 Air compressors.

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

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

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Electrical Machines
To avoid formation of grooves in the commutator

None of these
 the brushes of same polarity should track each other.
  brush position has no effect on the commutator grooving.
  the brushes of opposite polarity should track each other.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 375 rpm
 75 rpm
 3000 rpm
 1500 rpm

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Electrical Machines
In DC generators, electric current to the external circuit from armature is given through

 solid connection.
 slip rings.
 commutator.
 none of above.

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MORE MCQ ON Electrical Machines

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