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Electrical Machines

Electrical Machines
Which of the following relation is correct?

 Xd < Xq.
 Xd > Xq.
 Xd = Xq.
None of these

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

 18°
 30°
 36°
 72°

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

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

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Saddle shape.
 Triangular and directed towards main pole.
 Triangular and directed towards brush axis.
 Peaky in nature.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 8
 2
 4

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Electrical Machines
In a DC Shunt Motor the speed can be increased by

 Increasing the field current.
 Increasing the field current.
 Increasing the armature current.
 Decreasing the field current.

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