Question

Which material property is shown by the 1st figure?

(a) Tie and refractory materials

(b) Earth

(c) Rock

(d) Thermal insulation

This question was addressed to me in an interview for job.

My doubt stems from Sections of Solids in chapter Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing

Answer 1

Right answer is (a) Tie and refractory materials

Best explanation: A refractory material is a material that retains its strength at high temperatures. ASTM C71 defines refractories as “…non-metallic materials having those chemical and physical properties that make them applicable for structures, or as components of systems, that are exposed to environments above 1,000 °F. Refractory materials are used in for furnaces, kilns, incinerators, and reactors. They are also used to make crucibles and moulds for casting glass and metals and for surfacing flame deflector systems for rocket launch structures. Today, the iron- and steel-industry uses approximately 70% of all refractories produced.