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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 sinusoidal
 flat-topped
 rectangular
 co- sinusoidal

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Electrical Machines
Reversing the direction of rotation of split phase motors is done by

 reversing the terminals of main winding.
 reversing the terminals of starting winding.
All of these
 interchanging the capacitor from starting winding to main winding or vice versa.

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

  230.2 V.
 50 V.
 399 V.
 100 V.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 decrease
None of these
 not changed
 increase

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  crawling.
  relative speed.
  air gap.
  cogging.

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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

 170.
 180.
 160.
  150.

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MORE MCQ ON Electrical Machines

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