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Heat and Mass Transfer

Heat and Mass Transfer
The amount of radiation mainly depends on

Temperature of body
Type of surface of body
Nature of body
All of these

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Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Directly proportional to the surface area
Either (A) or (B)
Directly proportional to the difference of temperatures between the two bodies
Both (A) and (B)

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Heat and Mass Transfer
The energy distribution of an ideal reflector at higher temperatures is largely in the range of

Shorter wavelength
Wavelength has nothing to do with it
Longer wavelength
Remain same at all wavelengths

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Heat and Mass Transfer
The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as

Reflectivity
Intensity of radiation
Emissivity
Transmissivity

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Heat and Mass Transfer
Fouling factor is used

In heat exchanger design as a safety factor
In case of Newtonian fluids
When a liquid exchanges heat with a gas
None of these

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

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