⚗️ 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 of the following is not an acidic refractory ?Answer: Magnesia bricks Insulating refractories should haveAnswer: Low thermal conductivity Cold crushing strength of refractories depends upon itsAnswer: All (a), (b) and (c). Tar bonded dolomite bricksAnswer: All (a), (b) and (c). Electrical resistor bars are made ofAnswer: Silicon carbide Which is not an alumino-silicate refractory?Answer: Tar dolomite bricks. Periclase refractory contains mainlyAnswer: MgO Stainless steel is welded with difficulty because ofAnswer: Oxide film formation. Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is __________ Nm3 .Answer: 2.5 The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.Answer: 3 High speed steel tools retain their hardness upto a temperature of __________ °C.Answer: 900 Si percentage in silica refractories used in the walls of coke oven is aboutAnswer: 95 Wrought iron does not haveAnswer: Uniform strength in all directions. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?Answer: Water Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, whenAnswer: Prior cold deformation is increased. __________ are normally subjected to sub-zero treatment.Answer: Gauges or precision parts High thermal conductivity of a refractory material is not important, when it is to be used in theAnswer: Blast furnace Induced draft fans provided in large thermal power plant boilers have __________ blades.Answer: Backward curved Maximum safe working temperature for fireclay bricks is about __________ °C.Answer: 1550 Which of the following has the highest value of refractive index ?Answer: Diamond Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.Answer: 10 Ferromagnetic ceramic material is not used in theAnswer: Thermal insulation Theoretical volume of oxygen required for complete combustion of 1Nm³ of acetylene, in oxy-acetylene welding is __________ Nm³ .Answer: 2.5 Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.Answer: 14-20 Fireclay bricks are never used in the.Answer: Coke oven walls With increasing alumina content, the fusion point of high alumina refractoriesAnswer: Increases. Chrome magnesite bricks are used in theAnswer: All (a), (b) and (c) Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.Answer: 1000 Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).Answer: Graphite Out of the following, the joint produced by __________ has the lowest strength.Answer: Soldering