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Electrical Machines

Electrical Machines
The commutator segments of DC machines are made up of

 copper
 copper alloy
 hard-drawn copper
 brass

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Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 10
 24
 5
 12

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Electrical Machines
The flux involved in the emf equation of a transformer has

  maximum value.
 average value.
 total value.
 rms value.

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic no-load axis.
  Magnetic neutral axis.
 Magnetically no-load armature co-ordinate.
 Magnetic neutral armature co-ordinate.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

  Torque increase and speed decrease.
 Torque and speed both increase.
 Both torque and speed decrease.
 Torque decrease and speed increases.

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  maintaining constant excitation.
  oscillation cannot be damped.
  providing damper bars in the rotor pole faces.
  running the motor on leading power factors.

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