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Heat and Mass Transfer

Heat and Mass Transfer
Unit of thermal conductivity in M.K.S. units is

K cal/hr m² °C
K cal m/hr m² °C
K calm/hr °C
K cal/kg m² °C

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Heat and Mass Transfer
The most commonly used method for the design of duct size is the

Velocity reduction method
Dual or double method
Static regains method
Equal friction method

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Heat and Mass Transfer
A grey body is one whose absorptivity

Varies with temperature
Is equal to its emissivity
Varies with wavelength of the incident ray
Does not vary with temperature and. wavelength of the incident ray

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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
Four
Two
One

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called

None of these
Convection
Radiation
Conduction

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

h₀/k
h₀/2k
2k/h₀
k/h₀

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