⚗️ 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

Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form ofAnswer: Pellets Corrosion isAnswer: A chemical phenomenon. Which of the following is not an ore of copper?Answer: Cryolite Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.Answer: 80 and 20 __________ bricks should not be used in oxidising atmosphere.Answer: Carbon Fusion temperature of pure silica (SiO₂) is __________ °C.Answer: 1715 Which is not a high alumina refractory ?Answer: Dolomite Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.Answer: Beryllia Faster rate of drying of moulded refractories results in high __________ of refractories.Answer: Both (b) and (c) Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.Answer: Burning The highest melting pure oxide (m.p. > 3000°C)isAnswer: Thoria Refractories used in/for __________ should have low thermal conductivity.Answer: Insulation 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.Answer: Spalling resistance Silica bricks are never used for lining theAnswer: Beehive coke ovens. Which is not a natural insulating material?Answer: None of these Titanium is added to molten aluminium alloys before casting for the purpose ofAnswer: Improving fluidity. Magnesite refractories are generally not used in theAnswer: Steel melting furnace. Cemented carbide tools are not suitable for cuttingAnswer: Aluminium Which is an acidic refractory ?Answer: Fireclay The difference between gross & net calorific values of fuel is due to theAnswer: Heat carried away by steam from the combustion of hydrogen in the fuel. Which of the following is preferred for rivetting ?Answer: Butt joint Heating the hypoeutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is calledAnswer: Annealing Carborundum used for making crucibles for melting non-ferrous metals is chemicallyAnswer: Silicon carbide Mild steel has __________ crystal lattice structure.Answer: Body centred cubic (bcc) Which of the following does not have a sharp melting point ?Answer: Glass Aluminium is extracted fromAnswer: Bauxite Which of the following impurities reduces the refractoriness of magnesite bricks ?Answer: All (a), (b) & (c) __________ fluid force is not considered in the Navier-Stokes equation.Answer: Turbulent What is the value of entropy at 273°K ?Answer: 0 Tin is not present as an alloying element inAnswer: White metal