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Electrical Machines

Electrical Machines
Example of double excited machine is

 Synchronous motor.
None of these
 Both are correct.
 DC Shunt Motor

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Auto transformer starting.
  Direct online starting.
  Stator resistance starting.
  Rotor resistance starting.

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Can not be determined.
 Armature current.
 Mechanical power.
 Induced emf.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Shunt Motor
 Compound Wound DC Motor
 DC Series Motor
 Separately Excited DC Motor

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

 14.28%.
 15.30%.
 18.25%.
  16.67%.

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Electrical Machines
Which of the following bearings and their uses are correct

 neither 1 nor 2
 both A and B
 roller bearings → large machines
 ball bearings → small machines

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MORE MCQ ON Electrical Machines

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