1. Why is the area of yoke of a transformer usually kept 15–20% more than that of core? By maintaining the area of yoke 15–20% more than the area of core, the yoke flux density is reduced, and hence reducing the iron losses in the yoke portion.
2. Why are mittred joints preferred in transformer core? The mittred joints make the flux lines to flow along the direction of grain orientation, thereby reducing the iron loss and the no load current.
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