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Heat and Mass Transfer

Heat and Mass Transfer
Planck’s law holds good for

all coloured bodies
All of these
polished bodies
black bodies

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Heat and Mass Transfer
Thermal conductivity of glass wool varies from sample to sample because of variation in

Density
Porosity
All of these
Composition

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Heat and Mass Transfer
In free convection heat transfer, Nusselt number is function of

Grashoff number, Prandtl number and Reynold number
Grashoff number and Prandtl number
Prandtl number and Reynold number
Grashoff number and Reynold number

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Heat and Mass Transfer
The heat transfer from a hot body to a cold body is directly proportional to the surface area and difference of temperatures between the two bodies. This statement is called

Newton's law of heating
Newton's law of cooling
Stefan's law
First law of thermodynamics

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Heat and Mass Transfer
Two long parallel surfaces each of emissivity 0.7 are maintained at different temperatures and accordingly have radiation heat exchange between them. It is desired to reduce 75% of the radiant heat transfer by inserting thin parallel shields of emissivity 1 on both sides. The number of shields should be

Three
One
Two
Four

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Heat and Mass Transfer
Unit of thermal diffusivity is

kcal/m. hr °C
kcal/m² hr
m²/hr
m²/hr °C

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MORE MCQ ON Heat and Mass Transfer

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