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Heat and Mass Transfer

Heat and Mass Transfer
Planck’s law holds good for

black bodies
polished bodies
All of these
all coloured bodies

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Heat and Mass Transfer
The heat is transferred by conduction, convection and radiation in

Melting of ice
Boiler furnaces
Condensation of steam in condenser
None of these

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

Physical nature
Wave length
Temperature
All of these

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Heat and Mass Transfer
The thermal diffusivities for solids are generally

Less than those for gases
More or less same as for liquids and gases
More than those for liquids and gases
Less than those for liquids

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Heat and Mass Transfer
In free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the

Reynold's number
Grashoff's number
Reynold's number, Grashoff's number
Prandtl number, Grashoff's 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
25 mm
800 mm

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