Chemical Engineering MCQs

6108 MCQs  (Page 157 of 611)

Attempt Chemical Engineering Quiz
When the gas to be dissolved in liquid is a/an ___________________ then normally co-current adsorber are used?
A. Mixture of two gases
B. Pure gas
C. Ideal gas
D. Sparingly soluble gas
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_______________ equation applies to diffusivities in liquids?
A. Gilliland
B. Hirschfelder
C. Wilke and chang
D. None of these
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The relative volatility of a binary mixture at constant temperature _________________ the total pressure?
A. Decreases with increase in
B. Increases with increase in
C. Is independent of
D. None of these
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The mass transfer co-efficient for a solid sphere of radius ‘a’ dissolving in a large volume of quiescent liquid, in which „D’ is the diffusivity of solute, is _____________________?
A. D/a
B. D/2a
C. Proportional to √d
D. Dependent on the reynolds number
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Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature) ?
A. Log p vs. t
B. Log p vs. log t
C. T vs. p
D. P vs. log t
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The commonly used solvent in supercritical extraction is_____________________?
A. Methyl ethyl ketone
B. Water
C. Carbon tetrachloride
D. Carbon dioxide
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For the same system, if the same liquid used in an absorber is decreased, the tower height will__________________?
A. Increase
B. Decrease
C. Remain unaffected
D. Decrease or increase; depends on the type of liquid
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The equation, NA = (DAB . Pt /RTZ . PBM) (PA1 – PA2) is for_______________________?
A. Fick’s second law of diffusion
B. Steady state diffusion for stagnant case
C. Liquid m.t.c. by higbie penetration theory
D. None of these
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Perforated plate towers are unique for solvent extraction because, they provide_____________________?
A. Higher contact area
B. Better contact of the phase
C. Repeated coalescence & redispersion of the drop phase
D. None of these
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For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?
A. G/(fg . a)
B. Fg/(g . a)
C. (g . a)/fg
D. L/(fg . g)
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Word of the Day
26 Jul
Simultaneously
at the same time.
ایک ہی وقت میں، ایک ساتھ، بیک وقت

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