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Chemical Engineering Basics - Engineering

Q1:

Pick out the wrong statement about the machinability of metals. Machinability of a metal

A decreases with increase in strain hardening tendencies.

B decreases with increase in hardness, in general.

C depends on the composition, microstructure and physical & mechanical properties.

D decreases with increases in tensile strength & decrease in grain size.

ANS:D - decreases with increases in tensile strength & decrease in grain size.

The wrong statement about the machinability of metals is: "decreases with increases in tensile strength & decrease in grain size." In reality, the machinability of metals generally improves with a decrease in tensile strength and an increase in grain size. So, this statement contradicts the typical relationship between machinability and tensile strength/grain size.