⚗️ 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

Thermal pyrolysis of ethylene dichloride producesAnswer: Vinyl chloride Vulcanisation of rubberAnswer: Converts its plasticity into elasticity. Teflon isAnswer: Polytetra florouethylene (PTFE) __________ is produced by polymerisation of chloroprene.Answer: Neoprene Polyvinyl chloride (PVC) isAnswer: Made by employing emulsion polymerisation. Pick out the wrong statement regarding the solubility characteristics of high polymers.Answer: High molecul ar weight polymers on dissolving gives solution of very low viscosity. Pick out the wrong statement regarding the solubility characteristics of high polymers.Answer: High molecul ar weight polymers on dissolving gives solution of very low viscosity. Ebonite is a/anAnswer: Highly vulcanised rubber. Elastomers areAnswer: Having very high tensile strength and heat resistance. Which of the following additives are added to plastics to make it impervious to X-rays ?Answer: Barium salt Paper like thin plastic articles can be produced byAnswer: Vacuum thermo forming Addition polymerisation takes place either by a free radical mechanism or ionic machanism depending on the reagents used. Free radical polymerisation is catelyzed by __________ , which decompose to give free radicals.Answer: Organic peroxides Benzoyl chloride is not used as a catalyst in the manufacture ofAnswer: Polypropylene Epoxy resin is a polymer containing two or more groups called epoxide group or ethoxyline group. It is aAnswer: Both (b) and (c). The conversion of caprolactum in the above case is about __________ percent.Answer: 90 Polycaprolactum is also known asAnswer: Nylon-6 __________ scrap can be recycled & reutilised.Answer: Polythene All thermoplastic, thermosetting & elastic materials can be processed in a extrusion machine, however it can not be used for the production of plasticAnswer: Buckets Bakelite is a/anAnswer: None of these Polyvinyl alcohol is used as aAnswer: Water soluble adhesive. Epoxy resins (i.e., epoxide polymers)Answer: Contain an epoxy group ( ) at the ends of the polymer. Polymerisation product of C₂F₄ (carbon tetraflouride) is called P.T.F.E. (poly chloro tetra flouro ethylene). It is also calledAnswer: Teflon Which of the following is the lowest cost plastic commercially available ?Answer: Polythene Thermosetting plastic materialsAnswer: Can not be melted after forming. Terylene is a/anAnswer: None of these Rayon is a __________ fibre.Answer: Cellulosic Commercial production of polypropylene employs __________ polymerisation.Answer: Solution Bakelite (phenol-formaldehyde) resin can not be used asAnswer: Decorative paint. Adipic acid is an intermediate in the manufacture ofAnswer: Nylon-66 Softening point of high density polythene is about __________ °C.Answer: 135