Free Chemical Process Principles MCQs with Answers
2,710 Chemical Process Principles MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. 25°C, 2 atm
- B. 50°C, l0 atm
- C. 30°C, 200 mm Hg (absolute)
- D. 90°C, 45 atm
Explanation: Penicillin fermentation is carried out at a mild temperature near 25°C under aerobic conditions; the other listed temperatures and…
Correct answer: 25°C, 2 atm- A. Bacteria
- B. Undesirable taste and odour
- C. Bicarbonates & sulphates of calcium and magnesium
- D. Its corrosiveness
Explanation: The lime-soda process softens water by precipitating calcium and magnesium as carbonates and hydroxides, removing their bicarbonates and…
Correct answer: Bicarbonates & sulphates of calcium and magnesium- A. Recovery of product will be difficult
- B. None of these
- C. Uniformity of product cannot be achieved
- D. Contamination of pure culture would result
Explanation: Unsterilized air can introduce unwanted microorganisms into the fermenter, contaminating the carefully maintained pure culture.
Correct answer: Contamination of pure culture would result2244. Metallic soap (e.g. aluminium or calcium salts of fatty acids) can be used_______________________?
- A. As a lubricant
- B. As a rust preventive
- C. In hard water for cleaning of cloth
- D. As a foam depressant in distillation column
Explanation: Metallic soaps such as aluminium and calcium stearates form water-resistant, thermally stable lubricating greases.
Correct answer: As a lubricant- A. FeO.TiO2
- B. Fe4 [Fe (CN6)3]
- C. Ca SO4 . 2H2O
- D. AlF3 . 3NaF
Explanation: Prussian blue is ferric ferrocyanide, represented as Fe₄[Fe(CN)₆]₃. The other formulas correspond to compounds such as titanium-containing…
Correct answer: Fe4 [Fe (CN6)3]- A. Massecuite
- B. Essential oil
- C. Fatty acids
- D. Alcohol
Explanation: Molasses is a sugar-rich by-product of sugar manufacture and is fermented by yeast to produce alcohol, mainly ethanol.
Correct answer: Alcohol- A. None of these
- B. Anti-TB
- C. Antibiotic
- D. Anti-malarial
Explanation: Insulin is a hormone and antidiabetic medicine used to control blood glucose, not an antimalarial, anti-TB, or antibiotic drug.
Correct answer: None of these- A. Can use low grade brine
- B. Both B. and C.
- C. Involves higher investment in NH3 recovery units than that for crystallisation units for NH4Cl
- D. Has less corrosion problems
Explanation: Compared with the dual process, the conventional Solvay process has less corrosion because ammonium chloride is not crystallised as the…
Correct answer: Both B. and C.2249. The catalyst used in the manufacture of DDT (from chloral and chlorobenzene) is _________________?
- A. Dilute H2SO4
- B. Ultraviolet light
- C. Oleum
- D. None of these
Explanation: DDT is formed by condensing chloral with chlorobenzene in the presence of concentrated sulphuric acid supplied as oleum.
Correct answer: Oleum- A. 45
- B. 70
- C. 95
- D. 99.5
Explanation: Rectified spirit is the nearly azeotropic ethanol-water mixture obtained by ordinary fractional distillation and contains about 95%…
Correct answer: 95- A. It does not react with water
- B. Its kindling temperature in dry air is very low
- C. It is poisonous
- D. It is unstable
Explanation: White phosphorus has a very low kindling temperature and can ignite spontaneously in dry air.
Correct answer: Its kindling temperature in dry air is very low- A. Bleached easily
- B. Dull white in color
- C. Strong fibrous
- D. Dark colored
Explanation: The Kraft or sulphate process preserves cellulose fibres relatively well, giving pulp with high mechanical strength.
Correct answer: Strong fibrous- A. 250-300
- B. 90-100
- C. 15-30
- D. < 0
Explanation: The chloral-chlorobenzene condensation forming DDT is strongly exothermic, so industrial operation is kept at a relatively low…
Correct answer: 15-30- A. None of these
- B. CaCl2
- C. MgCl2
- D. Ca(HCO3)2
Explanation: Calcium bicarbonate causes temporary hardness because it decomposes on heating, whereas calcium chloride and magnesium chloride remain…
Correct answer: Ca(HCO3)2- A. CO
- B. C
- C. CO2
- D. H2
Explanation: Carbon monoxide is the principal reducing agent in a blast furnace; it removes oxygen from iron oxides to form iron and is itself oxidised…
Correct answer: CO- A. Alum
- B. Limestone
- C. Coke
- D. Quartz
Explanation: High-alumina cement is made by fusing bauxite, rich in alumina, with limestone, which supplies calcium oxide.
Correct answer: Limestone- A. Mono esters
- B. Fatty acids
- C. Fatty alcohol
- D. Triglyceride
Explanation: Vegetable oils are mainly triglycerides, which are esters of glycerol with long-chain fatty acids.
Correct answer: Triglyceride2258. In sulphate pulp manufacture, the pressure and temperature in the digestor is____________________?
- A. 10 atm., 170-180°C
- B. 10 atm., 800 °C
- C. 1 atm., 170 - 180°C
- D. 1 atm., 800°C
Explanation: Kraft or sulphate pulping digests wood chips with alkaline liquor at about 170 to 180°C, requiring a pressure near 10 atm in the digester.
Correct answer: 10 atm., 170-180°C- A. Mainly CaO
- B. A super cooled liquid
- C. Subjected to galvanising
- D. All A , B. and C.
Explanation: Glass is conventionally described as a supercooled liquid because it has an amorphous, non-crystalline structure and no sharp melting…
Correct answer: A super cooled liquid- A. Improve the soap texture
- B. Fasten lather formation
- C. Cure pimples & dandruff
- D. Increase its cleansing action
Explanation: Sulphur is added to medicinal soaps for its keratolytic and antimicrobial effects, helping treat acne and dandruff.
Correct answer: Cure pimples & dandruff