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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 flux (φ)
 both A and B
 armature current (I)
 speed

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Electrical Machines
In DC generators brushes are used for

 convert ac armature current in to dc
 collecting of current without any sparkings
 reduce eddy current loss
 collecting of voltage

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Electrical Machines
For larger units high torque it is preferred to use

 DC shunt motor.
 Partial motor.
 Universal motor.
 Slip induction motor.

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Electrical Machines
Damper winding is used to

 decrease the load current.
 both 1 and 2.
 suppress the hunting.
 increase the load current.

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Electrical Machines
Short circuiting is caused in the armature winding due to

  any of above.
  failure of insulation between two turns of coil.
 failure of insulation between two commutator bars.
  grounding of two or more turns of the same coil.

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 remain the same.
 be unpredictable.
 increase
 decrease.

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MORE MCQ ON Electrical Machines

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