Flooding in a distillation column is detected by a sharp
A. Increase in Murphree plate efficiency
B. Decrease in pressure drop
C. Decrease in liquid hold up in the coloumn
D. Increase in pressure drop
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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
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Which of the following is directly concerned with psychrometry?
A. Lewis reltionship
B. Galileo number
C. Weber number
D. Dean number
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The 'shanks system' of leaching (i.e., counter-current multiple contact leaching) is used for
A. Recovery of tannis from the tree barks and woods
B. Leaching sodium nitrate from Chilean nitrate bearing rock
C. Both A & B
D. Neither A nor B
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Which is not concerned directly with mass transfer?
A. Schmidt number
B. Sherwood number
C. Lewis relationship
D. Froude number
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Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.
A. Surface renewal
B. Film
C. Penetration
D. None of these
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Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular difusion, if
A. Mass transfer is accompanied by reaction
B. Diffusion of A is in stagnant medium B
C. Molecular mean free path is high
D. There is equimolar counter diffusion
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One mole feed of a binary mixture of a given composition is flash vaporised at a fixed P and T. If Raoult's law is obeyed, then changing the feed composition would effect
A. The product composition but not the fraction vaporised
B. The product composition as well as the fraction vaporised
C. The fraction vaporised but not the product composition
D. Neither the product composition nor the fraction vaporised
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The recovery of pencillin from the acidified fermentation broth is done by
A. Distillation
B. Evaporation
C. Absorption
D. Liquid extraction
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Absorption factor, for a fixed degree of absorption from a fixed amount of gas should be
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Polar organic compounds are normally used as separating agents for the azeotropic and extractive distillation. Which of the following is the most important factor to be considered for the choice of the separating agent for extractive distillation?
A. Cost
B. Availability
C. Toxicity
D. Selectivity
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Ponchan-Savarit method analyses the fractional equipment based on
A. Enthalpy balance only
B. Material balance only
C. Both enthalpy and material balances
D. The assumption of constant molaloverflow
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The solvent used in liquid extraction should not have high latent heat of vaporisation, because
A. The pressure drop and hence the pumping cost will be very high
B. It cannot be recovered by distillation
C. Its recovery cost by distillation may be prohibitatively high
D. It will decompose while recovering by distillation
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For absorbers, high pressure drop results in
A. Increased efficiency
B. Decreased efficiency
C. High operating cost
D. Better gas liquid contact
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The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of
A. Newtonion liquids
B. Non-Newtonion liquids
C. Ideal gases
D. Real gases
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Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the
A. High evaporation losses of water
B. High pressure drop of the gas
C. Difficulty in its fabrication
D. None of these
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Which of the following equipments is not used in liquid-liquid extraction?
A. Pachuka tank
B. Agitated vessels
C. Centrifugal extractors
D. Packed towers
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With increase in temperature, the solubility of gases in liquids, at fixed pressure
A. Increases
B. Decreases
C. Remains same
D. Either A or B, depends on the system
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Dryer widely used in a textile industry is __________ dryer.
A. Festoon
B. Cylinder
C. Conveyor
D. Tunnel
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Drying of a solid involves __________ transfer.
A. Only heat
B. Only mass
C. Both heat and mass
D. None of these
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