Discussion
For making the core of transformer silicon steel is preferred because :
Answer: C
Silicon steel is preferred because it reduces hysteresis loss.
Adding about 3 to 4 per cent silicon to iron narrows its hysteresis loop, so less energy is lost in reversing the magnetisation fifty times a second. It also raises the resistivity of the steel, which together with lamination cuts the eddy current loss, and it reduces ageing of the core.
The other reasons are wrong. Silicon raises resistivity rather than reducing it, and lower resistivity would increase eddy current loss. Silicon steel keeps a high permeability, which is what a transformer core needs. A change in tensile strength is not a reason to choose a core material; silicon actually makes the steel more brittle.
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