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Chemical Engineering Basics

Q1: Pick out the wrong statement.

A A soft magnetic material should have high permeability and small area of hysterisis loop.

B Poisson's ratio of high melting point metals is more than unity.

C Solders generally melt at less than 185°C.

D Steel produced by B.O.F process is ideally suited for manufacturing flat product.

ANS:B - Poisson's ratio of high melting point metals is more than unity.

The wrong statement is: "Poisson's ratio of high melting point metals is more than unity." Poisson's ratio is a dimensionless quantity that relates the relative contraction or expansion of material in directions perpendicular to the direction of a stretching force. It typically ranges between -1 and 0.5 for most materials, with negative values indicating expansion in one direction when stretched in another. Poisson's ratio cannot exceed 0.5 for isotropic materials and is usually much lower for most engineering materials, including metals. Therefore, the statement suggesting that Poisson's ratio of high melting point metals is more than unity is incorrect.

 



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