Physical Metallurgy Previous Year Question Papers with Solutions Pdf - 2

Question: 6

Which of the following alloying elements does not increase the hardeneability of steel?

(A) Cobalt

(B) Vanadium

(C) Molybdenum

(D) Manganese

Question: 7

Recrystallisation temperature is characterised by the

(A) Formation of spherical crystals from deformed ones, when a strained metal is heated

(B) Formation of first crystal from the molten metal, when it is cooled

(C) Growth of crystals

(D) Change of allotropic form

Question: 8

Which of the following has the lowest tensile strength?

(A) Bainite

(B) Cementite

(C) Ferrite

(D) Martensite

Question: 9

Machinability tends to decrease with decrease in

(A) Carbon content of carbide

(B) Strain hardening tendency

(C) Grain size

(D) Hardness and tensile strength

Question: 10

Case carburising is the most widely used method of case hardening of steel parts with

(A) Low carbon content

(B) Low tensile strength

(C) High corrosion resistance

(D) High hardness