⚗️ 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

Permeability of bricks is a measure of theAnswer: Rate at which a fluid will pass through the pores. Brinell hardness number (BHN) of a material is a number, which hasAnswer: Unity of force/area. Vanadium addition to steel improves itsAnswer: Heat treatability by quenching. With increase in the density of silica refractories, itsAnswer: Both (a) and (b). Plants produce carbohydrates from the CO₂ present in the atmosphere byAnswer: Photochemical reaction. Magnesite chrome refractoriesAnswer: Have better spalling resistance than chrome magnesite refractories. Fireclay bricks is not used for lining theAnswer: Roof of open hearth furnace. Identify the correct statement with reference to the extractive metallurgy of aluminium.Answer: The electrolyte consists of molten Na₃AlF₆ with approximately 1 to 8% Al₂O₃. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.Answer: 90 Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.Answer: Silica A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional toAnswer: particle diameter Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance toAnswer: Thermal spalling Which of the following is not used as an alloying element in steel used for making permanent magnetic material ?Answer: Vanadium Pick out the wrong statement.Answer: Inhalation of mercury vapour is not harmful for human beings. Thermal spalling mainly occurs during __________ of furnaces.Answer: Both (a) & (b) The fatigue resistance of a material is improved by the following technique.Answer: Shot peening Increase in temperature, in general results in theAnswer: Decrease in the viscosity of liquids and increase in that of gases. Which of the following can be manufactured using powder metallurgy techniques?Answer: All 'a', 'b' and 'c'. Removal of non-condensables from steam or other vapour is termed as the __________ process.Answer: Dearation An ideal refractory should have highAnswer: Fusion point Cold heading or upsetting is categorised as the __________ process.Answer: Forging Earing is a defect found in steels after the following metal working operation (s).Answer: Deep drawing For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.Answer: 500 Hydrogen can beAnswer: All(a), (b) & (c). __________ wire is never used for making the heating element.Answer: Invar Pick out the correct statementAnswer: Rocket engines carry oxygen required for the combustion in the form of oxidiser. Ammonia gas can be dried byAnswer: Quick lime Consumable electrodes are used in the __________ welding.Answer: Arc Magnesium is present inAnswer: Chlorophyll The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.Answer: Runner