Correct answer
A. Varies directly as the area and the LMTD
Explanation
The correct answer is Varies directly as the area and the LMTD.
The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C- 1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2.°C-1. The rate of heat loss from the outer surface in W.m-2is________?
Polycondensation reaction of polymerisation ________?
Nylon-66 is manufactured from________?
Which of the following is generally considered as opaque surface towards radiations?
For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is________?
The half life period of a radioactive element depends on its ________?