⚗️ 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

Regenerators are normally provided in theAnswer: All (a), (b) and (c). Largest application of laser welding is in __________ welding.Answer: Microspot Metallic recuperators are not used for waste heat recovery, if the hot flue gas temperature is above __________ °C, because corrosion prevails at higher temperatures.Answer: 750 Which of the following is a neutral flux used in the pyrometallurgy of metal extraction?Answer: Flourspar The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm² .Answer: 225.65 Furnace pressure is normally controlled by regulating theAnswer: Damper Value of a material is usually considered as a relationship betweenAnswer: Utility and cost. An example of indirectly heated furnace is theAnswer: Muffle furnace Which of the following is not an ore of zinc?Answer: Cerrusite Pressure gauges are never connected directly to the live steam line; rather a loop or syphon is interposed as close as possible to the pressure gauge. This is done toAnswer: Both 'a' & 'b'. Specific heating capacity of a furnace is expressed asAnswer: Weight heated/hr/furnace volume Phosphorous is added to copper melt toAnswer: Remove hydrogen. Which of the following is not a suitable solid lubricant ?Answer: None of these The main function of a muffle in the muffle furnace is toAnswer: Both (a) & (b) On an average __________ fast neutrons are produced by nuclear fission of each atom of uranium-235.Answer: 2.5 Flue gas outlet temperature from the chimney of any furnace should be ideally about __________ °C.Answer: 150 Very high pressure boilers are usually __________ boilers.Answer: Natural circulation Heat transfer rate to the charge/stock in a furnace does not depend upon theAnswer: Type of fuels viz solid, liquid or gaseous. Castability of aluminium is increased by the addition of __________ in it.Answer: Silicon Heat balance of furnace provides means of determining theAnswer: All (a), (b) and (c). Addition of __________ to steel can not impart it high strength at elevated temperature.Answer: Magnesium Thermal efficiency of furnaces can be improved byAnswer: All (a), (b) and (c). Hard magnetic materials have highAnswer: Both 'a' & 'b'. Shaft furnaces are used forAnswer: All (a), (b) and (c) The difference in the properties of a substance in three states of matter depends upon theAnswer: Difference in intermolecular forces. Hearth furnaces are not used forAnswer: None of these Ignition of fuel in a diesel engine is byAnswer: Hot compressed air What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m². °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.Answer: 2 Turn down ratio of a burnerAnswer: Is the ratio of maximum to minimum permissible heat input rates. Which of the following is not a continuous waste heat recovery equipment from the flue gases going out of furnace ?Answer: Regenerator.