Chemical Engineering · all questions

Mass Transfer
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Q421

The individual mass transfer co-efficients (moles/m².s) for absorption of a solute from a gas mixture into a liquid solvent are, K_L = 4.5 and K_G = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling?

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Q422

As the reflux ratio in a distillation coloumn is increased from the minimum, the

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Q423

As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages

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Q424

If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be __________ percent.

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Q425

A binary mixture of benzene and cyclohexane is separated by

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Q426

The relative saturation of an unsaturated mixture of gas and vapor is independent of the

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Q427

H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

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Q428

Which of the following plays an important role in problems of simultaneous heat and mass transfer?

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Q429

In most of the vacuum crystalliser, vacuum is generally produced by means of a

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Q430

A minimum boiling azeotrope is exemplified by

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Q431

Which of the following parameters remains constant during chemical dehumidification?

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Q432

Which of the following is not a continuous drier?

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Q433

As the reflux ratio increases, the slope of the operating line for rectifying section

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Q434

Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the

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Q435

When a multistage tray tower uses a minimum reflux ratio, it implies

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Q436

In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the

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Q437

Which of the following operations does not involve leaching?

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Q438

Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as

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Q439

Which of the following is the most commonly used leaching solvent in vegetable oil industry?

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Q440

Low viscosity absorbent is preferred for reasons of

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