7000+ Physical Metallurgy Quiz Questions and Answers - 2

Question: 6

Martensitic stainless steel is the only type of stainless steels which is hardenable by heat treatment, because of its

(A) Lower carbon to chromium ratio

(B) Higher carbon to chromium ratio

(C) Magnetic nature

(D) High thermal conductivity

Question: 7

Which of the following is the softest?

(A) Austenite

(B) Cementite

(C) Ferrite

(D) Pearlite

Question: 8

Heating the steel above upper critical temperature and then cooling in air is the process of

(A) Annealing

(B) Hardening

(C) Tempering

(D) Normalising

Question: 9

Boron in steel increases its

(A) Impact resistance

(B) Weldability

(C) Hardeneability

(D) Corrosion resistance

Question: 10

A burnt steel is characterised by the

(A) Darkening of the surface

(B) Glossy and smooth surface

(C) Fine grain size

(D) Presence of brittle iron oxide films