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Heat and Mass Transfer

Heat and Mass Transfer
Joule sec is the unit of

Thermal conductivity
Universal gas constant
Planck's constant
Kinematic viscosity

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Heat and Mass Transfer
The value of Prandtl number for air is about

0.7
0.3
0.1
1.7

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Heat and Mass Transfer
The amount of heat flow through a body by conduction is

Directly proportional to the surface area of the body
Dependent upon the material of the body
Directly proportional to the temperature difference on the two faces of the body
All of these

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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

20°C
40°C
60°C
66.7°C

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

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

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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

20°C
40°C
60°C
66.7°C

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