⚗️ 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

Which set of materials is used as a moderator in nuclear reactor ?Answer: Heavy water & berrelium. Malleabilisation heat treatment is performed onAnswer: White cast iron In salt bath furnace, heat is transferred to the charge mainly byAnswer: Conduction For hardening high alloy steel, it is to be heated slowly and uniformly to avoidAnswer: Warpage Disposable patterns are made ofAnswer: Polystyrene In order to maintain an oxidising atmosphere in a furnace, it should haveAnswer: More of excess air Combustion of fuel in a furnace with oxygen enriched air results in higherAnswer: Flame temperature The type of water filter normally employed/ preferred for treating small quantities of water in railway stations and individual industries is the __________ filter.Answer: Pressure The radioactive isotope of hydrogen isAnswer: Tritium Reducing atmosphere is maintained in aAnswer: Blast furnace Refrigerative cooling employed during long distance transportation of food stuffs is normally done byAnswer: Liquid nitrogen Presence of SO₂ in furnace gases attacks the ferrous metal by way ofAnswer: All (a), (b) and (c). Internal cracks in drawn bars are due toAnswer: Secondary tensile stresses. While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about __________ °CAnswer: 4500 Advantages of use of preheated combustion air areAnswer: All (a), (b) and (c). Amount of coal lost in ash particle, which is carried through the boiler system, depends upon theAnswer: All (a), (b) and (c) Yield strength of a polycrystalline metal with an average grain size, d, is proportional toAnswer: D⁻¹ᐟ² In case of pulverised coal fired steam boiler, the secondary air serves the main purpose ofAnswer: Combustion of coal by supplying it around the burner. A pipeline buried in soil is commonly protected from corrosion byAnswer: Cathodic protection. The heating capacity of continuous reheating furnace depends upon theAnswer: All (a), (b) and (c). Circulation of liquid metal (i.e. molten sodium) in a liquid metal cooled nuclear reactor is done by a/an __________ pump.Answer: Electromagnetic Fuel economy in an industrial furnace operation can not be achieved by the use ofAnswer: Stoichiometric combustion air. Titanium is produced by __________ of Ti Cl4.Answer: Magnesium reduction The function of an economiser in a boiler is to preheat theAnswer: Feedwater __________ strain gauge is the most sensitive sensing element for strain measurement.Answer: Semiconductor Which furnace employs an I.D. fan for the removal of flue gases from the furnace ?Answer: High pressure boiler. A simple closed grinding circuit may consist ofAnswer: A ball mill and a classifier. Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.Answer: 20 In a titration involving weak acid and strong base, the preferred indicator isAnswer: Phenolphthalein The advantages of firing pulverised coal in the furnace lies in the fact that, itAnswer: Accelerates the burning rate and economises on fuel consumption.