⚗️ 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

The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to theirAnswer: Equivalent weight. A material having good damping property is likely to haveAnswer: Greater defect density. Exposure to __________ accelarates the degradation of plastics.Answer: Ultraviolet radiation Steel produced from phosphatic iron is __________ in nature.Answer: Brittle __________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.Answer: Calorising Which of the following has the least oili-ness ?Answer: Mineral oils Surface finish of casting does not depend upon theAnswer: Metal temperature. Load cells used for the measurement of weight hasAnswer: All 'a', 'b' & 'c' While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.Answer: 2000 For the Stoke's law to be valid in the case of a falling sphere in a fluid, theAnswer: Sphere must be metallic. Ganister is a source of theAnswer: Silica Which brick undergoes maximum shrinkage on drying ?Answer: Fireclay bricks Which is the stable form of silica upto 1470°C ?Answer: Tridymite Hot face insulating linings of high purity alumina fused mullite are used, whereAnswer: All (a), (b) and (c). Semi-silica bricks compared to silica bricks haveAnswer: Both (a) and (b). Mixing of ground refractory material and water is done in a __________ mill.Answer: Pug Cold chiesel & hammers are made ofAnswer: High carbon steel Maximum apparent porosity of magnesite bricks is about __________ percent.Answer: 24 Which of the following does not lower the surface tension of liquids ?Answer: Fat __________ property of a material is determined by the Herbert Pendulum device.Answer: Hardness Cathodic protection is widely used in controlling corrosion inAnswer: Marine structure & underground pipelines. Dilatometer is used for the determination of __________ of refractories.Answer: Permanent linear change Methyl orange indicator turnsAnswer: Orange yellow in alkaline medium. Out of the following, the most melleable material isAnswer: Lead Addition of silicon to aluminium improves itsAnswer: Castability With decrease in porosity, the __________ of the refractories decreases.Answer: Spalling resistance Porosity of silica bricks varies from __________ percent.Answer: 20 to 30 Which of the following properties of a solid is not dependent on crystal imperfection ?Answer: Melting point In a good rimming steelAnswer: Carbon and silicon should be low. Colour of fireclay bricks isAnswer: Light buff to reddish buff