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Month: February 2019

The equation, NA = (DAB . Pt /RTZ) (y1 – y2) is for _______________________?

August 22, 2021February 14, 2019 by admin
The equation, NA = (DAB . Pt /RTZ) (y1 – y2) is for _______________________?

A. Steady state equimolar counter diffusion
B. Fick’s first law of diffusion
C. Steady state diffusion for stagnant case
D. Liquid M.T.C. by penetration theory

Categories Mass Transfer

Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) ?

August 22, 2021February 14, 2019 by admin
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) ?

A. (De.t)1/2
B. (De/t)1/2
C. (4De/πt)1/2
D. (4De/t)

Categories Mass Transfer

The relative volatility of a binary mixture at the Azeotropic composition is _______________________?

August 22, 2021February 14, 2019 by admin
The relative volatility of a binary mixture at the Azeotropic composition is _______________________?

A. 1
B. > 1
C. 0
D. ∞

Categories Mass Transfer

For absorbing a sparingly soluble gas in a liquid, the_____________________?

August 22, 2021February 14, 2019 by admin
For absorbing a sparingly soluble gas in a liquid, the_____________________?

A. Gas side co-efficient should be increased
B. Liquid side coefficient should be increased
C. Gas side co-efficient should be decreased
D. Liquid side co-efficient should be decreased

Categories Mass Transfer

Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the _______________ moisture?

August 22, 2021February 14, 2019 by admin
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the _______________ moisture?

A. Free
B. Unbound
C. Equilibrium
D. Bound

Categories Mass Transfer

For the flow of gases through a capillary, with increase in temperature, the permeability __________________ as per Knudsen law?

August 22, 2021February 14, 2019 by admin
For the flow of gases through a capillary, with increase in temperature, the permeability __________________ as per Knudsen law?

A. Increases
B. Decreases
C. Remain same
D. Either A. or B.; depends on the gas

Categories Mass Transfer

With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___________________?

August 22, 2021February 14, 2019 by admin
With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___________________?

A. Decreases
B. Remains unchanged
C. Increases
D. Decreases exponentially

Categories Mass Transfer

A natural draft cooling tower is filled with wooden grids, which covers about _________________ percent of the tower height?

August 22, 2021February 14, 2019 by admin
A natural draft cooling tower is filled with wooden grids, which covers about _________________ percent of the tower height?

A. 10-15
B. 30-40
C. 70-80
D. 90-100

Categories Mass Transfer

The Knudsen diffusivity is proportional to (where, T = absolute temperature) ______________________?

August 22, 2021February 14, 2019 by admin
The Knudsen diffusivity is proportional to (where, T = absolute temperature) ______________________?

A. √T
B. T2
C. T
D. T4

Categories Mass Transfer

Which of the following processes is not an example of adsorption applied to gaseous separations ?

August 22, 2021February 14, 2019 by admin
Which of the following processes is not an example of adsorption applied to gaseous separations ?

A. Recovery of valuable solvent vapors from dilute mixture with air and other gases
B. Dehumidification of air and gas
C. Removal of objectionable odour and impurities from industrial gases
D. Decolouration of yellow glycerine

Categories Mass Transfer
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