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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 18°
 36°
 30°
 72°

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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

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

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 uneven air-gap length
 magnetic saturation in half of the field pole
 non-sinusoidal nature of armature mmf
 component of armature mmf along field axis

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Electrical Machines
Diverters are used only in

 either of these
 series motors
 shunt motors
None of these

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Electrical Machines
Scott connections are used for

 any of the above.
 three phase to two phase transformation.
 single phase to three phase transformation.
 three phase to single phase transformation.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

  the use equalizer in lap winding.
 reactance voltage produced due to communication.
 the use drum winding.
 the use of compensating winding.

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