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Heat and Mass Transfer

Heat and Mass Transfer
Which of the following has maximum value of thermal conductivity?

Copper
Brass
Aluminium
Steel

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Heat and Mass Transfer
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called

Thermal resistance
Thermal conductivity
Thermal coefficient
Temperature gradient

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Heat and Mass Transfer
An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

160 mm
25 mm
800 mm
40 mm

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Heat and Mass Transfer
Unit of thermal conductivity in S.I. units is

J/m °K sec
W/m °K
J/m² sec
Option (B) and (C) above

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Heat and Mass Transfer
Cork is a good insulator because it has

Porous body
Free electrons
Low density
Atoms colliding frequency

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Heat and Mass Transfer
A designer chooses the values of fluid flow rates and specific heats in such a manner that the heat capacities of the two fluids are equal. A hot fluid enters the counter flow heat exchanger at 100°C and leaves at 60°C. A cold fluid enters the heat exchanger at 40°C. The mean temperature difference between the two fluids is

40°C
66.7°C
20°C
60°C

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