Which variety of steel may be expected to have lowest value of thermal conductivity?

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Q. Which variety of steel may be expected to have lowest value of thermal conductivity?

(A) High carbon steel (0.83% C)
(B) Low nickel steel (1.37% Ni)
(C) Low chromium steel (0.46% Cr)
(D) Chromium nickel steel (9% Ni, 18% Cr)

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✅ Correct Answer: (D) Chromium nickel steel (9% Ni, 18% Cr)

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