Chemical Engineering MCQs

6108 MCQs (Page 198 of 611)

Attempt Chemical Engineering Quiz

JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by___________________?

A. Nsh = 2
B. Nst = 2
C. Nsc = 2
D. None of these

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In liquid-liquid extraction, the number of phases at plait point is __________________?

A. 1
B. 2
C. 3
D. 4

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Molecular sieves are porous____________________?

A. Alumina
B. Silica
C. Synthetic zeolites crystals/metal alumino-silicates
D. None of these

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Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure. Nitrobenzene will distil off _______________ °C?

A. At < 100
B. At > 210.6
C. Between 100 and 210
D. None of these

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Selectivity of the solvent used in solvent extraction should be)_________________?

A. 1
B. > 1
C. < 1
D. 0

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The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the____________________?

A. Temperature rises
B. Pressure rises
C. Temperature falls
D. Pressure falls

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The dew point of a saturated gas phase equals the ________________ temperature?

A. Gas
B. Room
C. Wet bulb
D. None of these

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The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by __________________?

A. Raising the temperature
B. Lowering the total pressure
C. Both a. and b.
D. Neither a. nor b.

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Priming in a distillation column_________________?

A. Results from very low gas velocity
B. Is desirable from point efficiency consideration
C. Is characterised by the presence of foam throughout the space between trays
D. Reduces the overall pressure drop

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Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their____________________?

A. Viscosity
B. Density
C. Solubility
D. Relative volatility

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