⚗️ 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 carbide refractories have very lowAnswer: None of these. Fibre glass is a composite material ofAnswer: Glass fibre in a polymer matrix. According to thermodynamic Farenhite scale, the fundamental interval between ice point to steam point isAnswer: 180° Basic bricks are not made ofAnswer: Fireclay Maximum consumption of limestone is in the __________ industry.Answer: Fertiliser Austenite is notAnswer: Magnetic CWith increase in the alumina content in firebricks, its fusion point (refractoriness)Answer: Increases Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.Answer: Working Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2 . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm2 .Answer: 65 Out of the following, the __________ pipe has the least corrosion resistance.Answer: Wrought iron Zirconia refractoryAnswer: Is produced from baddeleyite. With increase in steam pressure, its specific volume decreasesAnswer: Rapidly first and then slowly. Which of the following rays has the least wavelength?Answer: Cosmic rays Which one contains maximum percentage of Al₂O₃ ?Answer: Sillimanite Hydrocyclone is aAnswer: Wet classifier Which of the following does not occur during firing/burning of refractories ?Answer: Decrease in crushing strength. Device used as a standard for the calibration of pressure gauges is aAnswer: Dead weight pressure tester X-rays areAnswer: Neutral. Silicon carbide refractories are used in theAnswer: All (a), (b) and (c). Diffusion co-efficient of a metal in a solid solution depends upon itsAnswer: Both (a) & (b) High density refractory bricks have lowerAnswer: Spalling resistance. Cast iron contains __________ percent carbon.Answer: 2.5 Cast iron contains __________ percent carbon.Answer: 2.5 Silliminite (Al₂O₃ .SiO₂) refractory, which is a neutral refractory, is not used inAnswer: Gas retorts Zircon refractories haveAnswer: All (a), (b) and (c). Cermets areAnswer: All (a), (b) and (c). Carbon refractory blocksAnswer: Are used in the hearth of blast furnace. Direct conversion of thermal energy to electrical energy is facilitated by theAnswer: Magneto hydrodynamic generator. The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.Answer: 0.2 Angular displacement can be measured suitably by aAnswer: Shaft encoder.