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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 1 V
 0 V
 4 V

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

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

 On armature.
 On yoke in the inter pole gap.
None of these
  On yoke in the pole faces.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 twice the initial value
 1/4 of the intial value
 4 time the initial value
 1/2 of the initial value

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

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

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 in order to reduce eddy current to provide large flux.
 as it carries large load current.
 to provide large flux.
 to reduce the insulation of materials.

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