Related Questions

The ratio of momentum diffusivity to thermal diffusivity is the __________ number.
A Prandtl
B Nusselt
C Stanton
D Grashoff
If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the
A Pressure
B Temperature
C Both A & B
D Neither A nor B
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
A 0
B 1
C > 1
In case of liquids, the binary diffusivity is proportional to (where, T = temperature)
A T
B $$\sqrt {\text{T}} $$
C T2
D $$\frac{1}{{\text{T}}}$$
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)
A D
B D2
C D0.5
D $$\frac{1}{{\text{D}}}$$
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
A $$\frac{1}{{\text{k}}}$$
B k
C k2
D $$\frac{1}{{{{\text{k}}^2}}}$$
In case of gases, the binary diffusivity is proportional to (where, P = pressure)
A P
B $$\frac{1}{{\text{P}}}$$
C $$\frac{1}{{\sqrt {\text{P}} }}$$
D $$\sqrt {\text{P}} $$
For a perfect gas, according to Boyle’s law (where p = Absolute pressure, v = Volume and T = Absolute temperature)
A $$\frac{{\text{v}}}{{\text{T}}}$$ = constant, if p is kept constant
B pv = constant, if T is kept constant
C $$\frac{{\text{T}}}{{\text{p}}}$$ = constant, if v is kept constant
D $$\frac{{\text{p}}}{{\text{T}}}$$ = constant, if v is kept constant
The absolute entropy for all crystalline substances at absolute zero temperature is
A Zero
B Negative
C More than zero
D Indeterminate
Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.
A Minimum energy
B Maximum energy
C Both (A) and (B)
D None of these

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