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Electrical Machines

Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 72°
 36°
 30°
 18°

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Electrical Machines
Induction motors have the advantage of

  simple in construction.
  less maintenance.
  less cost.
  all of below.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 20%
 increased by 20%
 increased by 10%
 reduced by 10%

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V²
 T ∝ 1/V
 T∝ V²
 T ∝ V

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the number of turns in field coil.
 increase the number of turns in armature coil.
  increase the speed of shaft rotation.
 increase the source frequency.

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 10%
 11%
 41%
 21%

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MORE MCQ ON Electrical Machines

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