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Heat and Mass Transfer

Heat and Mass Transfer
The critical thickness of insulation for a sphere is

h₀/k
2k/h₀
k/h₀
h₀/2k

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Heat and Mass Transfer
The total radiation from a black body per second per unit area is ________ fourth power of the absolute temperature. This statement is known as Stefan Boltzmann law.

None of these
Inversely proportional to
Directly proportional to
Equal to

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Heat and Mass Transfer
The amount of radiation mainly depends on

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

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Heat and Mass Transfer
Heat is transferred by all three modes of transfer, viz. conduction, convection and radiation in

Steam condenser
Boiler
Electric heater
Refrigerator condenser coils

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Heat and Mass Transfer
The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

Equal to Nusselt number
Less than one
Equal to one
Greater than one

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

Nusselt number
Weber number
Prandtl number
Grashoff number

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