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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 0o.
 dependent upon the load.
 180o.
 90o.

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 0.1 µF.
  2 - 3 µF.
  1 - 2 µF.
 5 - 10 F.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to the square of armature current.
 Proportional to armature current.
 Inversely proportional to armature current.
  Constant.

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Electrical Machines
Commutators in DC machines have a role of which converts

 Both AC to DC and DC to AC.
 none of these.
 AC to DC.
 high voltage DC to low voltage DC.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Heavy sparking at brushes.
 Heavy sparking at the first stud of starting resistance steps.
 Both of above.
 None of these.

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 kept constant to certain value.
 decreased.
  remains unchanged.
 increased.

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MORE MCQ ON Electrical Machines

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