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 $$\frac{1}{{\text{T}}}$$
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 $$\sqrt {\text{P}} $$
The Knudsen diffusivity is dependent on the
A Molecular velocity only
B Pore radius of the catalyst only
C Molecular mean free path only
D Molecular velocity and por radius of the catalyst
The binary diffusivity in gases does not depend upon the
A Pressure
B Temperature
C Nature of the components
D None of these
The binary diffusivity in gases and liquids vary respectively as
A $${{\text{T}}^{\frac{3}{2}}}$$ and T
B T and $${{\text{T}}^{\frac{3}{2}}}$$
C $$\sqrt {\text{T}} $$ and $${{\text{T}}^{\frac{3}{2}}}$$
D $${{\text{T}}^{\frac{3}{2}}}$$ and $$\sqrt {\text{T}} $$
The binary diffusivity in gases at atmospheric conditions is about
A 10-9 cm/sec
B 10-1 cm2/sec
C 10-3 sec/cm
D 10-4 cm2/sec2
Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as
A Sheradising
B Parkerising
C Anodising
D None of these

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