chemical engineering MCQs – Page 85

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 Review each marked answer and report any item that may be outdated or unclear.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
1681. Most important factor to be considered in the selection of packings for absorbers is the ______________ of packing?
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A. Cost

B. Durability

C. Size

D. Porosity
1682. Which of the following is used for the concentration of rubber latex ?
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A. Short tube evaporator

B. Calandria

C. Agitated film evaporator

D. Long tube vertical evaporator

1683. Use of water having dissolved oxygen in boilers promotes___________________?
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A. Scale formation

B. Sequestration

C. Corrosion

D. None of these

1684. Unsaturated air (with dry and wet bulb temperatures being 35 and 25C respectively) is passed through water spray chamber maintained at 35C. The air will be__________________?
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A. Cooled

B. Humidified

C. Both A. & B.

D. Dehumidified

1685. What is the degree of freedom of an absorption process in which only one component is transferred between phases ?
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A. 3

B. 2

C. 4

D. 1

1686. Hydrazine is largely used____________________?
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A. In photographic industry

B. As a starting material for hypo

C. As rocket fuel

D. In printing industry

1687. The wet and dry bulb temperature for a vapour-gas mixture are 25C and 30C respectively. If the mixture is heated to 45C at constant pressure, the wet bulb temperature will be ______________ C ?
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A. 25

B. > 25

C. 25

D. < 25

1688. _______________ equation applies to diffusivities in liquids?
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A. Gilliland

B. None of these

C. Hirschfelder

D. Wilke and Chang

1689. Gun powder uses_____________________?
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A. Charcoal

B. All A , B, & C.

C. Potassium nitrate

D. Sulphur

1690. Riboflavin is a/an____________________?
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A. Anaesthetics

B. Analgesic drug

C. Vitamin

D. Anti-malarial drug

1691. Raoults law does not apply, when the___________________?
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A. Size of component molecules are not equal

B. mation of solution

C. Component molecules are non-polar

D. Attractive forces between like and unlike molecules in the solution are approximately equal

E. Chemical combination or molecular association between unlike molecules takes place in the

1692. Absorption of SO3 in 97% H2SO4 is_______________?
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A. Not possible

B. None of these

C. Endothermic

D. Exothermic
1693. The dew point of an unsaturated gas-vapor mixture does not depend upon the _________________ of the mixture?
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A. Total pressure

B. Composition

C. Temperature

D. All A, B. and C.

1694. Mechanism of moisture removal in case of freeze drying of food stuff is by ___________________?
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A. Adsorption

B. Sublimation

C. Evaporation

D. Dehydration

1695. Which of the following increases during evaporative cooling process with recirculated water supply ?
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A. Wet bulb temperature

B. Relative humidity

C. Partial pressure of vapour

D. Both B. and C.
1696. Cumene is the starting material for the production of________________?
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A. Benzoic acid

B. Isoprene

C. Styrene

D. Phenol and acetone
1697. The relative volatility of a binary mixture at the Azeotropic composition is _______________________?
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A. 0

B. > 1

C. 1

D. ?

1698. For a binary mixture with low relative volatility___________________?
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A. Use steam distillation

B. Use high pressure distillation

C. An azeotrope may be formed during distillation

D. Use molecular distillation

1699. H2S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H2S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in meters) corresponding to an operating line given by, y = 5x + 0.001 is ______________________?
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A. 2.0

B. 0.56

C. 1

D. 1.56

1700. In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) ?
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A. 8.25

B. 8.89

C. 6.89

D. 10