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Electrical Machines

Electrical Machines
The armature reaction mmf in a DC machines has a form of

  triangular.
 sinusoidal.
 trapezoidal.
 rectangular.

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 below rated speed
None of these
 both A and B

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

 160.
  150.
 170.
 180.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 230 V
 6 V
 somewhat more than 230 V
 somewhat less than 230 V

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 5.7 Ω
 2.2 Ω
 1.9 Ω
 6 Ω

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Fleming's left hand rule.
 Lenz's law.
 Fleming's right hand rule.
 Ampere law.

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MORE MCQ ON Electrical Machines

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