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Electrical Machines

Electrical Machines
In DC generators, the residual magnetism is of the order of

  15 %.
  20 %.
  2.5 %.
 10 %.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very high.
 Normal.
 Zero.
 Very low.

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become leading
 will remain the same
None of these
 will become lagging

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Electrical Machines
If starter is not used with large DC motor for starting, it will

 damage the armature and commutator.
 all of above.
 draw a starting current many times its rated full load current.
 provide execessive voltage drop in line.

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Electrical Machines
Which of the DC Motor use flywheel?

 Differently compared motor.
 Cumulatively compound motor.
 Shunt motor.
 Series motor.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  3600 rpm.
  4000 rpm.
  1500 rpm.
  3000 rpm.

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MORE MCQ ON Electrical Machines

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