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Heat and Mass Transfer

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

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

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Heat and Mass Transfer
Thermal conductivity of water at 20°C is of the order of

0.51
0.23
0.42
0.1

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

K cal/hr m² °C
K calm/hr °C
K cal m/hr m² °C
K cal/kg m² °C

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

Copper
Aluminium
Brass
Steel

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Heat and Mass Transfer
Total heat is the heat required to

Increase the temperature of a liquid or vapour
Convert water into steam and superheat it
Change liquid into vapour
Change vapour into liquid

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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
20°C
66.7°C
60°C

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