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Heat and Mass Transfer

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

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

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Heat and Mass Transfer
The radiation emitted by a black body is known as

Black radiation
Total radiation
Full radiation
All of these

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

0.1
0.42
0.23
0.51

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Heat and Mass Transfer
Depending on the radiating properties, body will be transparent when (Where a = absorptivity, p = reflectivity, x = transmissivity)

P = 0, x = 0 and a = 1
X = 0, a + p = 1
P=1, x = 0, and a = 0
P = 0, x= 1, and a = 0

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Heat and Mass Transfer
The concept of overall coefficient of heat transfer is used in case of heat transfer by

Conduction and convection
Conduction
Convection
Radiation

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Heat and Mass Transfer
Which of the following property of air does not increase with rise in temperature?

Density
Thermal diffusivity
Thermal conductivity
Dynamic viscosity

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