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. Starch
- B. Proteins
- C. Cellulose
- D. Nucleic acids
Explanation: Proteins are polypeptides formed when amino acids join through peptide bonds.
Correct answer: Proteins- A. Epoxy
- B. Alkyd
- C. Amino
- D. Phenolic
Explanation: Amino resins result from condensation of formaldehyde with nitrogen-containing compounds such as urea or melamine.
Correct answer: Amino- A. Propylene
- B. Urea & formaldehyde
- C. Phenol & acetaldehyde
- D. Phenol & formaldehyde
Explanation: Bakelite is a thermosetting phenol-formaldehyde resin formed by condensation polymerisation, with water released during network formation.
Correct answer: Phenol & formaldehyde- A. Brittle
- B. Ductile
- C. Malleable
- D. None of these
Explanation: At room temperature, ordinary polystyrene is rigid and brittle because its glass-transition temperature is above room temperature.
Correct answer: Brittle- A. Maximum feed size determines the required roll diameter
- B. For hard material's crushing, the reduction ratio should not exceed 4
- C. of surface produced
- D. Reduction ratio and differential roll speed affect production rate & energy consumed per unit
- E. Both the rolls run necessarily at the same speed
Explanation: Roll crushers need not operate at the same speed; differential speed is deliberately used to influence crushing, capacity, and energy…
Correct answer: Both the rolls run necessarily at the same speed- A. With increase in the reactor pressure, octane number of gasoline decreases
- B. With increase in the reactor temperature, gasoline yield decreases for a given conversion
- C. All A., B. and C.
- D. Percentage conversion increases with increase in the catalyst to oil ratio
Explanation: Increasing the catalyst-to-oil ratio generally increases conversion, while higher reactor pressure tends to reduce gasoline octane.
Correct answer: All A., B. and C.- A. 1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg
- B. 1 BTU/ft3 = 8.9 kcal/m3 = 0.038 MJ/m3
- C. 1 kcal/m3 = 0.1124 BTU/ft3
- D. 1 BTU/lb = 2.3 kcal/kg
Explanation: One BTU/lb equals about 0.556 kcal/kg, because 1 BTU is 0.252 kcal and one pound is 0.4536 kg.
Correct answer: 1 BTU/lb = 2.3 kcal/kg- A. High molecular weight polymers on dissolving gives solution of very low viscosity
- B. Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents
- C. Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent
- D. Greater the degree of cross-linking in the polymer, lesser is its solubility
Explanation: Cross-linking restricts polymer chains and reduces their ability to separate and dissolve, while high-molecular-weight polymers generally…
Correct answer: High molecular weight polymers on dissolving gives solution of very low viscosity- A. 1 : 2
- B. 3 : 1
- C. 1: 3
- D. 2 : 1
Explanation: SBR typically contains about 25% styrene and 75% butadiene by weight, giving a styrene-to-butadiene ratio of 1:3.
Correct answer: 1: 3- A. Treylene
- B. Orlon
- C. Dacron
- D. Saran
Explanation: Saran is the copolymer of vinyl chloride and vinylidene chloride, valued for its good chemical resistance and low permeability.
Correct answer: Saran- A. Perspex
- B. Teflon
- C. Bakelite
- D. Nylon-6
Explanation: PMMA is commonly marketed as Perspex, a transparent acrylic plastic used in glazing and optical applications.
Correct answer: Perspex- A. 1000 to 5000
- B. 20000 to 25000
- C. 5000 to 1000
- D. 109 to 1011
Explanation: The molecular weight of many commercial plastics is commonly quoted in the range of about 20,000 to 25,000 in introductory polymer texts.
Correct answer: 20000 to 25000- A. Polythene
- B. Polyester
- C. Bakelite (phenol formaldehyde)
- D. Nylon-6
Explanation: Bakelite is formed by extensive phenol-formaldehyde cross-linking, producing a rigid three-dimensional network.
Correct answer: Bakelite (phenol formaldehyde)- A. Water soluble adhesive
- B. Cation/anion exchanger
- C. Textile fibre
- D. Non-sticky coating on frying pans
Explanation: Polyvinyl alcohol contains many hydroxyl groups, making it water-soluble and useful as a water-soluble adhesive.
Correct answer: Water soluble adhesive- A. Phenol
- B. Benzene
- C. Naphthalene
- D. Pyridine
Explanation: Industrial caprolactam production can begin with benzene, which is converted through cyclohexane and cyclohexanone to cyclohexanone oxime…
Correct answer: Benzene- A. 25
- B. 50
- C. 70
- D. 90
Explanation: The stated industrial conversion in the caprolactam process is approximately 90%, so the closest option is 90 percent.
Correct answer: 90- A. Poor tensile strength
- B. Poorer resistance
- C. Greater amount of heat build up heavy loading
- D. All A., B. and C.
Explanation: Compared with natural rubber, SBR generally has lower tensile strength and poorer resilience, and it develops more heat under heavy…
Correct answer: All A., B. and C.- A. Cellulose
- B. Lignin
- C. Polyamides
- D. Ethylene glycol
Explanation: Rayon is a regenerated cellulose fibre, made by chemically dissolving cellulose and then reforming it into filaments.
Correct answer: Cellulose- A. Thermoplastic
- B. Melamine
- C. Addition
- D. None of these
Explanation: Melamine-formaldehyde resin is a hard thermosetting polymer used for unbreakable crockery and laminates.
Correct answer: Melamine- A. Polyurethane
- B. Phenol formaldehyde
- C. Styrene butadiene rubber (SBR)
- D. Polychlorophrene
Explanation: Neoprene is the trade name for polychloroprene, produced by polymerising chloroprene.
Correct answer: Polychlorophrene