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Heat and Mass Transfer

Heat and Mass Transfer
The rate of energy transferred by convection to that by conduction is called

Nusselt number
Biot number
Stanton number
Peclet number

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Heat and Mass Transfer
Thermal conductivity of non-metallic amorphous solids with decrease in temperature

Increases
May increase or decrease depending on temperature
Decreases
Remain constant

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Heat and Mass Transfer
The amount of radiation mainly depends on

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

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

Different temperatures
Different atomic structure
Different specific heat
Different heat contents

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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
160 mm
40 mm
800 mm

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Heat and Mass Transfer
Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of

0.002
0.02
0.01
0.1

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