⚗️ Chemical Engineering Solved MCQs with Answers

Practice 1920 approved ⚗️ Chemical Engineering questions with verified answers from the 🛠️ Engineering Essentials subject for Pakistan exams.

1920 solved MCQs

Pick out the wrong statement.Answer: Dacron fibres, acrylic fibres, viscose rayon fibres & cellulose acetate fibres are all prepared by wet spinning. Main constituent of cotton fibre isAnswer: Cellulose Which of the following is not a thermoplastic material ?Answer: Epoxy polymer Which of the following is an inorganic polymer ?Answer: Silicones __________ moulding is used for shaping of thermosetting plastics exclusively.Answer: Transfer Bristles of tooth brushes are made ofAnswer: Nylon-66 Pick out the wrong statement.Answer: None of these Starting material for the production of butadiene in India isAnswer: Ethyl alcohol Liners of bags are usually made ofAnswer: Polypropylene Poly Vinyl chloride (PVC) is a __________ material.Answer: Thermoplastic Temperature and gage pressure maintained during the manufacture of hot SBR (styrene butediene rubber) areAnswer: 50°C and 3 - 4 kg/cm² Polystyrene is a __________ plastic at room temperature.Answer: Brittle Amino resins are used in paper treatment to improve itsAnswer: All (a), (b) & (c) The inter particle forces between linear chains in nylon-66 are __________ bonds.Answer: Hydrogen Molecular weight of polymers are in the range ofAnswer: 10²-10⁷ The physical state in which polymers exist isAnswer: All (a), (b) and (c). Orlon isAnswer: Obtained by polymerising vinyl cyanide. Acrylonitrile-butadiene-styrene (ABS) copolymer, which is produced by blending styrene-acrylonitfile copolymer with butadiene based elastomer, is a/anAnswer: Engineering plastic Contact lenses for eyes are made of perspex, which is nothing butAnswer: Polymethylmethacrylate The repeating units of PTFE areAnswer: F₂ C = CF₂ Low pressure Zeigler process of polythene manufactureAnswer: Achieves an yield of 95-98% based on ethylene. __________ are produced by reacting polybasic acid (e.g. phthalic anhydride) with polyhydric alcohol (e.g., glycerol).Answer: Alkyd resins Which of the following is an elastomer ?Answer: Thiokol Alkyd resin e.g., glyptal resin formed by phthalic anhydride and glycerene is not usedAnswer: For fibre making. The monomer for the production of neoprene rubber isAnswer: Chloroprene A copolymer is formed by the combination of two or more monomer moleculesAnswer: In a chain without the elimination of water. Thermoplastic resins usuallyAnswer: Less brittle than thermosetting resins. Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed byAnswer: Radial settling tank (thickener) using coagulant (lime & ferrous sulphate). Persons working in cement plants and limestone quarries are more prone to disease likeAnswer: Silicosis Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are calledAnswer: Aerosols