7000+ Physical Metallurgy Multiple Choice Questions - 1

Question: 1

The energetic driving force for grain growth is due to

(A) Residual strains in different grains

(B) Stacking fault energy

(C) Dislocations in the matrix

(D) Grain boundary energy

Question: 2

Which of the following elements is essentially added to steel during heat treatment to inhibit grain growth in austenite?

(A) Aluminium

(B) Brass

(C) Copper

(D) Tin

Question: 3

In cyaniding

(A) Case depth is about 10 mm

(B) Carbon and nitrogen are introduced into the surface of steel and then it is quench hardened

(C) Distortion does not occur during heat treatment

(D) Molten potassium cyanide bath is used

Question: 4

Since the atomic spacings in crystals are of the order of a few angstrom, the crystal structure of metal are studied by

(A) X-ray technique

(B) Diffusion techniques

(C) Electron microscopy

(D) Ultrasonic method

Question: 5

Solute atoms which cause yield point phenomenon in mild steel are/is

(A) Aluminium

(B) Boron

(C) Carbon

(D) Nitrogen