1.

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.°CThis 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»

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.



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