Engineering Materials - Study Mode

[#276] Argentite is the principal ore or raw material for
Correct Answer

(D) Silver

Explanation

Solution: Silver is extracted from the ore-argentite

[#277] Melting point of iron is
Correct Answer

(A) 1539°C

Explanation

Solution: Melting point of iron is 1539°C

[#278] The metallic structure of mild steel is
Correct Answer

(A) Body centered cubic

Explanation

Solution: The metallic structure of mild steel is Body Centered Cubic (BCC) . In a BCC structure, each atom is positioned at the center of a cube and has eight nearest neighbors at the corners of the cube. Therefore, the correct answer is Option A: Body centered cubic .

[#279] The basic constituents of Hastelloy are
Correct Answer

(B) Nickel, molybdenum etc.

Explanation

Solution: The basic constituents of Hastelloy are 22% chromium, 13% molybdenum, and less than 3% iron.

[#280] The crystal structure of gamma iron is
Correct Answer

(B) Face centered cubic

Explanation

Solution: The crystal structure of gamma iron is Face centered cubic. The gamma iron is shown in figure: