⚗️ 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

Polyesters are manufactured by the polycondensation reaction ofAnswer: Dibasic acid with dihydric alcohol. Thermosetting materialsAnswer: Are cross-linked molecules. A chain growth polymerisation reaction consists of three different types of reaction namely initiation reaction, propagation reaction & termination reaction. Chain growth polymerisation reaction is not involved in the manufacture ofAnswer: Urea-formaldehyde resins. Nylon-6 is aAnswer: Polyamide Rain coats are made ofAnswer: PVC Condensation polymerisation of __________ produces bakelite.Answer: Urea & formaldehyde __________ is not a condensation polymer.Answer: Teflon Nylon-66 is a polyamide ofAnswer: Hexamethylene diamine and adipic acid. Polymers are classified into four categories namely thermosetting, thermoplastic, elastomer and fibre depending upon theirAnswer: Magnitude of intermolecular forces. Which of the following is not a natural fibre?Answer: Viscose rayon Polyurathane can not be used to makeAnswer: Fibre reinforced plastic (FRP) Terylene isAnswer: Both(a) & (b) Cross linked polymers formed from bi-and trifuctional groups in which cross-linkage in three dimensions via few chemical bonding across linear chains occur imparts to the polymer __________ properties.Answer: Elastometric Polypropylene compared to polythene isAnswer: All (a), (b) and (c). The rate controlling step in the manufacture of silicone rubber is theAnswer: None of these Buna-S is also calledAnswer: SBR Diphenylamine is added to rubber toAnswer: Protect it from deterioration on exposure to air. Vulcanisation of raw rubber makes itAnswer: Less elastic Polycaprolactum (Nylon - 6) is produced by the condensation polymerisation of caprolactum at 240-280°C in which the conversion of caprolactum is about __________ percent.Answer: 90 Viscose rayon isAnswer: None of these Hot drink (e.g, tea) cups are usually made ofAnswer: Polystyrene Pick out the wrong statement.Answer: Phenol manufacture by chlorobenzene-caustic process is competitive even when low cost chlorine is not available. Polyurathane can not be used for makingAnswer: Bottles Polystyrene is a light, transparent, thermoplastic material used for makingAnswer: Toys and combs Cation exchange resins (0.3 to 1 mm size) used in water treatment is prepared from __________ resins.Answer: Urea formaldehyde Valcunisation of rubber decreases itsAnswer: Tackiness. Plastic articles are normally produced by __________ moulding.Answer: Injection Thermocole (expanded polystyrene) is not used forAnswer: High temperature thermal insulation in furnaces. Linear polymers are normallyAnswer: Thermosplastic. Alkyd resin can not be used for makingAnswer: Fibres