chemical engineering MCQs – Page 98

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
1941. In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of_________________?
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A. 1.5

B. -1.5

C. -0.6

D. 0.6

1942. Which of the following is not a unit of mass transfer co-efficient ?
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A. Moles transferred/ [(time) (area) (pressure)]

B. Moles transferred/ [(time) (area) (mass A/mass B)]

C. Moles transferred/ [(time) (area) (mole fraction)]

D. None of these
1943. Which of the following is directly concerned with Psychrometry ?
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A. Galileo number

B. Lewis relationship

C. Dean number

D. Weber number

1944. Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the_________________?
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A. Mass transfer co-efficient

B. Volumetric diffusivity

C. Thermal diffusivity

D. Kinematic viscosity

1945. Powdery materials can be guarded against caking tendency on storage by_________________?
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A. Having maximum possible points of contact

B. Providing minimum percentage of voids

C. Providing irregular grain size

D. None of these
1946. The solvent used in liquid-liquid extraction should have _______________ less than one?
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A. Selectivity

B. Distribution co-efficient

C. Both A. and B.

D. Neither A. nor B.
1947. Hypersorption refers to a ________________ process?
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A. Fixed bed adsorption

B. Moving bed adsorption

C. Moving bed absorption

D. Fixed bed absorption

1948. When the solvent dissolves very little of solute, then__________________________?
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A. Solvent of low latent heat of vaporisation should be used

B. Solvent of low freezing point should be used

C. Very small quantity of solvent is required

D. Large quantity of solvent is required to extract the solute
1949. A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is___________________?
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A. 1.94

B. 0.54

C. 1.04

D. 1.24
1950. Unsaturated air (with dry bulb and wet bulb temperatures being 45C and 25C respectively) is passed through a water spray chamber maintained at 23C. The air will be cooled and _________________?
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A. None of these

B. Dehumidified

C. Humidified with wet bulb temperature decreasing

D. Humidified at constant wet bulb temperature

1951. The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________________?
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A. D ? 1/P0.5

B. D ? 1/P1.5

C. D ? P0.5

D. D ? 1/P
1952. The process employing desorption of the absorbed solute by a solvent is called____________________?
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A. Osmosis

B. Elution

C. Reverse osmosis

D. Sublimation

1953. Diameter to height ratio for a raschig ring is_____________________?
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A. 8

B. 1

C. 0.5

D. 2

1954. Sand is dried in foundries in a ______________________drier?
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A. Rotary

B. Vacuum

C. Spray

D. Fluidised bed
1955. The main reason for dividing a tall packed tower into series of small towers is to________________________?
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A. Reduce liquid hold up

B. Minimise the overall pressure drop

C. Avoid flooding

D. Avoid channelling
1956. Dimension of mass diffusivity is the same as that of_____________________?
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A. Pressure

B. Surface tension

C. Kinematic viscosity

D. Dynamic viscosity

1957. At what percentage (by volume) of alcohol composition, it forms an azeotrope with water ?
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A. 90

B. 91.5

C. 95

D. 99

1958. _______________ diffusion is used for separating the isotopes of methane ?
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A. Thermal

B. Force

C. Concentration

D. Pressure

1959. In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________________ its relative saturation?
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A. Higher than

B. Equal to

C. Lower than

D. Either A. or B., depends on the mixture composition

1960. Minimum reflux ratio in a distillation column results in__________________?
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A. Optimum number of trays

B. Minimum number of trays

C. Maximum condenser size

D. Minimum reboiler size