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Electrical Machines

Electrical Machines
Slot wedges in a dc machine is made up of

 silicon steel.
 cast iron.
 mild steel.
 fibre.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce eddy current loss only.
 increase the permeability.
 reduce both eddy current and hysteresis loss.
 reduce hysteresis loss only.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 0
 ∞
 a positive finite value
 a finite negative value

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Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 72
 74
 36
 37

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 cosδ
 cos2δ
 sinδ

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Electrical Machines
For the above problem, find the induced voltage of an alternator of it is to deliver a load of 100 A at power factor of 0.8 lagging with terminal voltage of 200 V.

  222 V.
 225 V.
 220 V.
 230 V.

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