⚗️ 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

Silicon crystal can be converted to p-type semi-conductor by doping withAnswer: Boron Large diameter reinforced cement concrete (RCC) pipes are generally joined by __________ joint.Answer: Collar Spalling tendency of refractories is reduced by increasing itsAnswer: Porosity Increase in the entropy of a system represents theAnswer: Degradation of energy. Property responsible for the talcum powder to cling to the skin is theAnswer: Adhesion Carbon refractories are exclusively used in theAnswer: Hearth of blast furnace. __________ has a negative co-efficient of linear expansion.Answer: Copper Wave length of X-rays is about 1 angstron, however it can not pass through a sheet ofAnswer: Lead Alloying elements present in Hayness stel-lite, which has superior performance than high speed steel, areAnswer: Tungsten, chromium & cobalt. The minimum and the maximum number of members required to form a Private Limited Joint Stock Company are respectivelyAnswer: 2 and 50 Spalling of a refractory means itsAnswer: Fracture due to uneven expansion at high temperature. The leaching solvent used in Baeyer's process for the purification of bauxite isAnswer: Sodium carbonate Austempering process results in the formation of __________ structure.Answer: Bainitic Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weightAnswer: 3 Basic open hearth furnace (BOF) is not used for producing __________ steel.Answer: High alloy Principal alloying element in Elinvar (used for making hair springs for watches) isAnswer: Nickel The value of y = cₚ/cᵥ. at < 500°C for air & most common gases can be safely assumed to beAnswer: 1.4 Tesla metre per ampere (T. m/A) is the unit for the measurement ofAnswer: Permeability of free space. Chromite refractories are used inAnswer: Both (a) & (b) Which of the following has the lowest electrical resistivity ?Answer: Graphite Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractoryAnswer: Castables Silica bricks have low spalling resistance below 600°C, due to itsAnswer: High co-efficient of expansion upto this temperature. Tar dolomite bricks are used in theAnswer: All (a), (b) and (c) Which furnace consumes maximum refractory annually in an integrated steel plant ?Answer: L.D. converter Lower part of hot metal mixer are lined with __________ bricks.Answer: Carborundum Carbon bricks are not used in the lining of theAnswer: Combustion chamber of blast furnace stoves. Sillimanite is a __________ refractory.Answer: High alumina Pick out the wrong statement.Answer: Vitrification of fireclay material is done to increase its porosity. High refractorinness of refractory bricks means, that it has aAnswer: High resistance to fusion. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.Answer: 2700