chemical engineering MCQs – Page 87

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 Review each marked answer and report any item that may be outdated or unclear.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

1721. In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the ______________ number ?
0

A. None of these

B. Lewis

C. Grashoff

D. Sherwood

1722. For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause ______________ plate requirement?
0

A. None of these

B. Major decrease in the number of

C. No change in theoretical

D. Marginal decrease in the number of

1723. Plate efficiency in a distillation column is reduced due to the ______________ of liquid?
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A. Entrainment

B. Weeping & dumping

C. All A., B. & C.

D. Foaming

1724. The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is_______________________?
0

A. 5

B. 10

C. 100

D. 1

1725. The Knudsen diffusivity is proportional to (where, T = absolute temperature) ______________________?
0

A. T2

B. T

C. ?T

D. T4

1726. Which of the following is a detergent ?
0

A. Fatty acids

B. Methylene chloride

C. Alkyl benzene sulphonate (ABS)

D. Fatty alcohol

1727. Most commonly used rubber vulcanising agent is___________________?
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A. Alumina

B. Bromine

C. Platinum

D. Sulphur

1728. _____________ is used as a catalyst in fat splitting ?
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A. FeO

B. V2O5

C. ZnO

D. Ni

1729. Molality is defined as the number of gm moles of solute per _________________ of solvent ?
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A. Litre

B. gm

C. m3

D. Kg

1730. The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if___________________?
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A. NSc = NLe

B. NPr = NLe

C. NSc = 1

D. NSc = NPr = NLe

1731. Danckwerts developed the ____________________ theory?
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A. Film

B. Penetration

C. None of these

D. Surface renewal

1732. Lewis number (Le) is____________________?
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A. Sh Pr

B. Sc Pr

C. St Sh

D. Pr St

1733. With increase in the mass velocity of the gas, the rate of drying during the constant rate period ______________, if the conduction and radiation through the solid are negligible ?
0

A. Increases linearly

B. Decreases

C. Increases

D. Remain same

1734. In gas-liquid contact operation, the number of ideal stages, N = (xa xb)/(xb x*b). This is true when the stripping factor S is ________________?
0

A. S = ?

B. S > 1

C. S = 1

D. S < 1

1735. Yeast is used in the manufacture of ____________________?
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A. Penicillin

B. Wine

C. Antibiotics

D. Pasteurised milk

1736. Henrys law states that the ________________________?
0

A. our

B. uid</strong>

C. Partial pressure of a component over a solution is proportional to its mole fraction in the

D. Partial pressure of a component over a solution is proportional to the mole fraction in the

E. Vapour pressure is equal to the product of the mole fraction and total pressure

F. Partial pressure is equal to the product of the mole fraction and total pressure

1737. Which of the following is used as a coagulant in treating turbid water ?
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A. Ferric sulphate

B. Activated carbon

C. Calcium sulphate

D. Chlorine

1738. Grignard reagent is chemically known as ____________________?
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A. Dichlorophenol

B. Methyl magnesium chloride

C. Monochloroacetic acid

D. Ethyl magnesium chloride

1739. Synthetic glycerine is produced from___________________?
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A. Propylene

B. Naphthalene

C. Toluene

D. Phenol

1740. A substance produced by a living organism and capable of anti-microbial activity is called a/an < ____________________?
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A. None of these

B. ong>A. Antibiotic</strong>

C. Antiseptic

D. Disinfectant

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