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Heat and Mass Transfer

Heat and Mass Transfer
Which of the following has maximum value of thermal conductivity?

Aluminium
Brass
Copper
Steel

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

Option (B) and (C) above
W/m °K
J/m² sec
J/m °K sec

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Heat and Mass Transfer
Total heat is the heat required to

Change liquid into vapour
Change vapour into liquid
Increase the temperature of a liquid or vapour
Convert water into steam and superheat it

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Heat and Mass Transfer
When absorptivity (α) = 1, reflectivity (ρ) = 0 and transmissivity (τ) = 0, then the body is said to be a

Black body
Grey body
White body
Opaque body

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Heat and Mass Transfer
The ratio of Nusselt number and the product of Reynold's number and Prandtl number is equal to

Stanton number
Biot number
Grashoff number
Peclet number

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Heat and Mass Transfer
Thermal conductivity of water _________ with rise in temperature.

May increase or decrease depending upon temperature
Increases
Decreases
Remain same

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