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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/hr m² °C
K cal/kg m² °C
K calm/hr °C

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Heat and Mass Transfer
Heat is closely related with

Energy
Entropy
Temperature
Liquids

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Heat and Mass Transfer
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Conduction
Conduction and convection
Radiation
Convection

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

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

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Heat and Mass Transfer
The emissive power of a body depends upon its

All of these
Wave length
Temperature
Physical nature

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Heat and Mass Transfer
The ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body. This statement is known as

Kirchhoff's law
Stefan's law
Wien's law
Planck's law

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