⚗️ 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

"'Dikes' are low height walls made around the storage vessels meant for storing hazardous & inflammable material (e.g., petroleum products). Volume of dikes is equal to (where, V = volume of the storage vessel)Answer: V Rate of slag attack on refractories increases with rise in temperature due to theAnswer: Decreased viscosity of slag. Which of the following is not a high alumina refractory material ?Answer: Periclase Magnesite chrome bricks are used in theAnswer: All (a), (b) and (c). Addition of __________ to steel does not help in improving its machinability.Answer: Silicon Chalcopyrite is an ore ofAnswer: Copper The following is employed as sacrificial anode to provide cathodic protection to ships, pipelines and storage tanks.Answer: Magnesium Heat transfer by __________ is almost absent in case of fluidised bed drying operation.Answer: Radiation Increasing the carbon content of steelAnswer: Increasing the ductility transition temperature. Mullite is chemically represented byAnswer: 3Al₂O₃ . 2SiO₂ __________ bricks are used in the burning zone of a cement rotary kiln.Answer: High alumina Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should beAnswer: Either (a) or (b) Roof of a basic open hearth furnace is lined with __________ bricks.Answer: Silica High alumina refractories are used in theAnswer: All (a), (b) and (c). __________ metal is used as a bearing liner material.Answer: Babbit Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.Answer: 30 For an ideal gas, Cₚ - Cᵥ isAnswer: R Porosity of fireclay refractories is __________ percent.Answer: 10-25 Sand used to stop the green sand from sticking to the pattern is termed as the __________ sand.Answer: Parting Brazing filler metal used for joining steel platesAnswer: Melts below the melting points of base metals. SiO₂ percentage in firebrick is aboutAnswer: 55-60 Fine grain size in metallic material willAnswer: Increase the fatigue strength. Porosity is induced in insulating refractories by addingAnswer: All (a), (b) and (c). Electrometallurgical methods of metal extraction is normally used for those metalsAnswer: All (a), (b) & (c). Magnesite bricks have poor resistance to attack by __________ slag.Answer: Acid Lowering of recrystallisation temperature of metals can be achieved by itsAnswer: All a, b & c. An example of a buffer solution isAnswer: Human blood A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.Answer: 370 Name the safety device used to protect the boiler, when the water level falls below a minimum level.Answer: Fusible plug Zirconia refractories are not used inAnswer: Furnaces subjected to fluctuating temperature.