chemical engineering MCQs – Page 100

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 Review each marked answer and report any item that may be outdated or unclear.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
1981. Leaching rate is independent of the________________?
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A. None of these

B. Agitation

C. Temperature

D. Particle size

1982. In case of ______________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated?
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A. Azeotropic

B. Extractive

C. Molecular

D. Flash

1983. Lewis number (Le) is___________________?
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A. St Sh

B. Pr St

C. Sc Pr

D. Sh Pr

1984. The operating cost of a distillation column at minimum reflux ratio is____________________?
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A. Zero

B. Minimum

C. Maximum

D. Infinite

1985. Alcohol is dehydrated using _______________________ distillation?
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A. Azeotropic

B. Extractive

C. Molecular

D. Steam

1986. Most important factor to be considered in the selection of packings for absorbers is the ______________ of packing?
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A. Porosity

B. Size

C. Cost

D. Durability

1987. Flash distillation is suitable for the separation of components_________________?
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A. Which form maximum boiling azeotrope

B. Having very wide boiling points

C. Having very close boiling points

D. Which form minimum boiling azeotrope

1988. In rectifying section of a continuous distillation column, the____________________?
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A. None of these

B. Liquid is stripped of high boilers

C. Vapour is enriched with low boilers

D. Vapour is enriched with high boilers
1989. Which of the following is not a batch drier ?
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A. Vacuum shelf drier

B. Truck drier

C. Fluidised bed drier

D. Agitated pan drier

1990. Mass transfer co-efficient K according to penetration theory varies with mass diffusivity as____________________?
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A. D1.5

B. 1/D

C. D0.5

D. D

1991. Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the ________________ temperature?
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A. Adiabatic saturation

B. Wet-bulb

C. Dew point

D. Dry-bulb

1992. In a packed bed absorption column, the channelling will be noted by the ____________________?
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A. None of these

B. Increase in flow rate

C. Sharp drop in pressure drop

D. Sharp rise in pressure drop

1993. Which of the following decreases during evaporative cooling process with recirculated water supply ?
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A. Partial pressure of vapour

B. Wet bulb temperature

C. None of these

D. Relative humidity

1994. An air-water vapour mixture has a dry bulb temperature of 60C and a dew point temperature of 40C. The total pressure is 101.3 kPa and the vapour pressure of water at 40C and 60C are 7.30 kPa and 19.91 kPa respectively. The humidity of air sample expressed as kg of water vapour/kg of dry air is__________________?
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A. 0.122

B. 0.079

C. 0.048

D. 0.152
1995. The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an _________________ law?
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A. Cubic

B. Exponential

C. Linear

D. Parabolic

1996. The reciprocal of stripping factor is termed as ________________________?
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A. Absorption factor

B. Relative volatility

C. Murphree efficiency

D. Selectivity index

1997. Equilibrium-moisture curves of different solids ____________________ ?
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A. Depend on the humidity of the gas

B. Are same

C. None of these

D. Are different
1998. Desirable value of absorption factor in an absorber is___________________?
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A. 1

B. > 1

C. < 1

D. 0.5

1999. Hydrogenation of oil is carried out in a/an _______________ in Vanaspati manufacturing plant?
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A. Bubble cap column

B. Packed tower

C. Agitated vessel

D. Sieve tray column

2000. Absorption with chemical reaction is involved in the removal of__________________?
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A. Ammonia from coke oven gas using refrigerated water

B. Tar from coke oven gas in primary gas coolers using chilled water

C. Carbon dioxide from gaseous stream using alkaline solution

D. Benzol from coke oven gas using solar oil/wash oil