Question

The coefficient of heat conductivity of heat-insulating materials does not exceed _________

(a) 0.18 kcal/m.hr.°C

(b) 0.28 kcal/m.hr.°C

(c) 0.38 kcal/m.hr.°C

(d) 0.48 kcal/m.hr.°C

This question was posed to me during an internship interview.

This interesting question is from Miscellaneous Materials topic in portion Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

Answer 1

The correct choice is (a) 0.18 kcal/m.hr.°C

To elaborate: The coefficient of heat conductivity of heat-insulating materials does not exceed 0.18 kcal/m.hr.°C. These materials are needed to give protection against heat and cold. They are generally porous.