The ratio of kinematic viscosity to thermal diffusivity is called the __________ number.

The ratio of momentum diffusivity to thermal diffusivity is the __________ number.

A

Prandtl

B

Nusselt

C

Stanton

D

Grashoff

If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

A

0

B

1

C

> 1

The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________ at room temperature.

A

Air

B

Water

C

Mercury

D

Alcohol

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

Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

A

$$\frac{1}{{\text{k}}}$$

B

k

C

k²

D

$$\frac{1}{{{{\text{k}}^2}}}$$

The kinematic viscosity is the

A

Ratio of absolute viscosity to the density of the liquid

B

Ratio of density of the liquid to the absolute viscosity

C

Product of absolute viscosity and density of the liquid

D

Product of absolute viscosity and mass of the liquid

The unit of kinematic viscosity is

A

gm/cm-sec²

B

dyne-sec/cm²

C

gm/cm²-sec

D

cm²/sec

Kinematic viscosity of water as compared to that of air is

A

More

B

Same

C

15% more

D

15% less

Which of the following is not a unit of kinematic viscosity?

A

Poise

B

Stoke

C

Cm²/second

D

None of these

Which of the following is the unit of kinematic viscosity?

A

Pascal

B

Poise

C

Stoke

D

Faraday

The ratio of kinematic viscosity to thermal diffusivity is called the __________ number.

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