RRB ALP Electrician 22 Jan 2019 Shift 1 Paper

Question : 40 of 175

Marks: +1, -0

A brick wall having a thickness of 24 cm has an inner surface temperature of 25°C and an outer surface temperature of 5°. The rate of heat loss through per square metre of the wall (thermal conductivity = 0.15 J/ (s⋅m⋅k)) is: