In AC circuits, laminated iron is invariably used in order to:a)Reduce eddy current lossb)Increase heat radiationc)Make assembly cheap and easierd)Reduce circuit permeabilityCorrect answer is option 'A'. Can you explain this answer?

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RRB NTPC/ASM/CA/TA Exam > RRB NTPC/ASM/CA/TA Questions > In AC circuits, laminated iron is invariably ...

In AC circuits, laminated iron is invariably used in order to:

a)
Reduce eddy current loss
b)
Increase heat radiation
c)
Make assembly cheap and easier
d)
Reduce circuit permeability

Correct answer is option 'A'. Can you explain this answer?

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Verified Answer

In AC circuits, laminated iron is invariably used in order to:a)Reduce...

Eddy Current Losses:
In AC circuits like transformers, the iron-core losses are generated due to eddy currents flowing along the surface, the larger the path current travels the larger loss.
Eddy Current Losses are due to emf induced by a changing magnetic field. This emf causes the circulating current in the core which causes power loss.

The process of lamination involves dividing the core into thin layers held toqether by insulatina materials such as Varnish, Impreanated paper, etc.
Due to lamination effective cross-section area of each layer reduces and hence the effective resistance increases.
As effective resistance increases. the eddv current losses will aet decrease.
A laminated iron core has reduced eddv current losses because the laminations are insulated from each other.

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In AC circuits, laminated iron is invariably used in order to:a)Reduce eddy current lossb)Increase heat radiationc)Make assembly cheap and easierd)Reduce circuit permeabilityCorrect answer is option 'A'. Can you explain this answer?

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