chemical engineering MCQs – Page 77

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 Review each marked answer and report any item that may be outdated or unclear.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
1521. Molecular sieves are regenerated by heating to ______________ C?
comments icon0
A. 200-330

B. > 500

C. < 150

D. > 1000

1522. In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in_________________?
comments icon0

A. Reducing the axial mixing

B. Maintaining the concentration difference between the two phases

C. All A , B & C.

D. Increasing the rate of extraction

1523. To get high tray efficiency___________________?
comments icon0
A. Interfacial surface between liquid and gas phase should be large

B. Gas velocity should be very low

C. Time of contact between the two phases should be less

D. Liquid entrainment should be severe

1524. Dehydrogenation of Isopropanol produces ____________________?
comments icon0

A. Formaldehyde

B. Acetone

C. Propyl alcohol

D. Trichloroethylene

1525. Silicon carbide is a/an_______________?
comments icon0

A. Brittle material

B. Type of glass

C. Abrasive

D. Adhesive

1526. Relative volatility varies with the concentration of component for an ideal solution. The relative volatility of a binary mixture may be defined as the ratio of vapor pressure of component A to that of component B, when_________________?
comments icon0

A. Only liquid phase obeys Daltons law

B. Vapor phase obeys Daltons law and liquid phase obeys Raoults law

C. Only vapor phase follows Raoults law

D. Liquid phase obeys Daltons law and vapor phase obeys Raoults law

1527. Trinitro-toluene (TNT) is _________________ ?
comments icon0

A. Used in glycerine manufacture

B. None of these

C. An explosive

D. Used in dye manufacture

1528. Sucrose content in cane sugar may be around ______________________ percent ?
comments icon0
A. 95

B. 80

C. 70

D. 50

1529. For gas absorption, low viscosity solvents are preferred, because of their ____________________?
comments icon0

A. Rapid absorption rates

B. Low pumping pressure drop

C. Better flow characteristics

D. All A., B. and C.
1530. Which of the following is a disaccharide ?
comments icon0

A. Starch

B. Glucose

C. Sucrose

D. Maltose

1531. Alcohol is dehydrated using ______________ distillation?
comments icon0

A. Molecular

B. Steam

C. Extractive

D. Azeotropic
1532. The product obtained on mixing calcium oxide with water is called __________________?
comments icon0

A. Milk of lime

B. Slaked lime

C. None of these

D. Quicklime

1533. For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be ___________________?
comments icon0

A. 2

B. 0

C. 3

D. 1
1534. The process used for the manufacture of ethyl alcohol from molasses is_________________?
comments icon0
A. None of these

B. Dehydrogenation

C. Distillation

D. Dehydration

1535. The slope of 9-line is determined by the__________________?
comments icon0

A. Relative volatility

B. Plate efficiency to be achieved

C. Thermal condition of the feed

D. Reflux ratio

1536. Powdery materials can be guarded against caking tendency on storage by___________________?
comments icon0

A. Providing irregular grain size

B. Providing minimum percentage of voids

C. None of these

D. Having maximum possible points of contact

1537. In industrial nomenclature, alcohol means_________________?
comments icon0

A. Butyl alcohol

B. Ethanol

C. Propyl alcohol

D. Methyl alcohol

1538. Solvay process is not used for the manufacture of potassium carbonate, because of the reason that potassium bicarbonate ?
comments icon0

A. All A , B. and C.

B. Has high water solubility and is unstable

C. Is soluble in ammonium chloride and potassium chloride solution

D. Is prone to thermal decomposition

1539. Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of _______________ humidity?
comments icon0

A. Relative

B. Percentage

C. Molal

D. None of these

1540. Rayleighs equation applies to ________________ distillation?
comments icon0

A. Flash

B. Differential

C. Steam

D. Continuous