Chemical Engineering MCQs

6108 MCQs (Page 174 of 611)

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The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is__________________?

A. 0
B. ∞
C. -ve
D. +ve

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In a gas-liquid absorption column, for obtaining the maximum absorption efficiency____________________?

A. Liquid stream should be distributed uniformly
B. Gas stream should be distributed uniformly
C. Both gas as well as liquid streams should be distributed uniformly
D. By passing should be completely avoided

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Lewis number (Le) is___________________?

A. Sc × pr
B. Pr × st
C. Sh × pr
D. St × sh

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For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause ____________________ plate requirement?

A. No change in theoretical
B. Marginal decrease in the number of
C. Major decrease in the number of
D. None of these

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At the boiling point of the liquid at the prevailing pressure, the saturated absolute humidity becomes______________________?

A. 1
B. 0
C. ∞
D. None of these

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Which of the following is an undesirable property in a tower packing ?

A. Large surface per unit volume
B. Large free cross-section
C. Low weight per unit volume
D. Large weight of liquid retained

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High pressure at the bottom of a distillation tower handling heat sensitive materials results in _____________________?

A. Thermal decomposition of bottoms
B. Increased relative volatility
C. Erosion of the tower
D. Very efficient operation

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In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be_____________________?

A. At ground level
B. 2 metres above the ground
C. 5 metres above ground
D. 10 metres above ground

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Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a ________________ column?

A. Spray
B. Packed
C. Bubble cap plate
D. Wetted wall

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Experimental determination of _______________ is done by wetted wall column method?

A. Diffusion co-efficient
B. Mass transfer co-efficient
C. Ntu
D. None of these

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