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Heat and Mass Transfer

Heat and Mass Transfer
If the temperature of a solid surface changes form 27°C to 627°C, then its emissive power changes in the ratio of

3
9
81
270

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Heat and Mass Transfer
According to Stefan Boltzmann law, ideal radiators emit radiant energy at a rate proportional to

Fourth power of absolute temperature
Square of temperature
Fourth power of temperature
Absolute temperature

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Heat and Mass Transfer
A non-dimensional number generally associated with natural convection heat transfer is

Weber number
Prandtl number
Grashoff number
Nusselt number

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Heat and Mass Transfer
An electric cable of aluminium conductor (k = 240 W/mK) is to be insulated with rubber (k = 0.15 W/mK). The cable is to be located in air (h = 6 W/m²). The critical thickness of insulation will be

160 mm
40 mm
800 mm
25 mm

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Heat and Mass Transfer
Moisture would find its way into insulation by vapour pressure unless it is prevented by

High vapour pressure
High thickness of insulation
A vapour seal
Less thermal conductivity insulator

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Heat and Mass Transfer
The heat transfer takes place according to

Second law of thermodynamics
First law of thermodynamics
Kirchhoff's law
Zeroth law of thermodynamics

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