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Heat and Mass Transfer

Heat and Mass Transfer
In a heat exchanger with one fluid evaporating or condensing, the surface area required is least in

Cross flow
Counter flow
All of these
Parallel flow

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Heat and Mass Transfer
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to

-1
=-1/3
1
=-2/3

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Heat and Mass Transfer
Heat transfer by radiation mainly depends upon

All of these
Kind and extent of its surface
Its temperature
Nature of the body

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

Prandtl number
Weber number
Nusselt number
Grashoff number

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Heat and Mass Transfer
According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

Absolute temperature
Cube of the absolute temperature
Square of the absolute temperature
Fourth power of the absolute temperature

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Heat and Mass Transfer
Thermal diffusivity of a substance is given by (where h = Thermal diffusivity, ρ = Density of substance, S = Specific heat, and k = Thermal conductivity)

h = kρ/S
h = ρS/k
h = S/ρk
h = k/ ρS

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MORE MCQ ON Heat and Mass Transfer

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