⚗️ 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

An example of a periodic furnace is theAnswer: Blast furnace stoves Ostwald charts are meant forAnswer: Computing the excess/deficiency of combustion air. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)Answer: X⁰·⁸ __________ cycle is the most efficient thermodynamic cycle.Answer: Carnot Maximum heat transfer in high temperature furnaces is byAnswer: Radiation Dew point of air indicates itsAnswer: Moisture content Which of the following is a natural draft furnace ?Answer: Blast furnace stoves Out of the following, __________ waves have the largest wavelength.Answer: Radio Pick the odd man out of the following.Answer: Calorising To reduce the stack loss, heat recovery from flue gas can be done byAnswer: All (a), (b) and (c). Large tonnage of refractory bricks are dried in aAnswer: Tunnel kiln A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.Answer: 0.1 Pulverised fuel fired furnaces employ __________ fuel firing.Answer: All (a), (b) and (c) Which of the following is not a directly fired furnace ?Answer: Open hearth furnace Hot working of lead is carried out atAnswer: 373°K An engineer's hammer is made of high __________ steel.Answer: Carbon The reason for excessive clinker formation in gas producers is theAnswer: All (a), (b) and (c). Impeller & casing of centrifugal pump handling corrosive liquid and frequently running under cavitation condition is most prone to __________ corrosion.Answer: Pitting Which of the following is not an additive for flue gases from furnace to reduce its dew-point?Answer: None of these Acid dew point temperature (ADT) of a flue gas produced by the combustion of a fuel containing 1% sulphur may be about __________ °C.Answer: 130 Isotropic materials have the same __________ in all the directions.Answer: Elastic properties Low stack loss indicates theAnswer: Efficient use of fuel. Thermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.Answer: 80 The gases used in the treatment of asthma is a mixture of __________ and oxygen.Answer: Helium Heat transfer rate to the stock/charge in the furnace does not depend upon theAnswer: Use of waste heat recovery equipments. Coke ovens in steel plant are heated byAnswer: Both (b) and (c) Grinding wheel made of silicon carbide is most suitable for grinding materials of low tensile strength (e.g; tough bronze). Grinding is a __________ operation.Answer: Surface finishing Power required in case of forced draught as compared to induced draught (for the same draught produced) isAnswer: Less Which of the following is the most effective inhibitor of grain growth, when added in small quantity in steel ?Answer: Vanadium Means for giving direction to the circulation of gases in furnaces areAnswer: All (a), (b) and (c).