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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
270
81
9

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Heat and Mass Transfer
Heat flows from one body to other when they have

Different atomic structure
Different heat contents
Different specific heat
Different temperatures

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Heat and Mass Transfer
In regenerator type heat exchanger, heat transfer takes place by

Flow of hot and cold fluids alternately over a surface
Generation of heat again and again
A complete separation between hot and cold fluids
Direct mixing of hot and cold fluids

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

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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

25 mm
800 mm
160 mm
40 mm

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Heat and Mass Transfer
The value of the wave length for maximum emissive power is given by

Wine’s law
Stefan’s law
Planck’s law
Kirchhoff’s law

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MORE MCQ ON Heat and Mass Transfer

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