⚗️ 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

Pick out the wrong statement:Answer: The value of crushing load is more than that of buckling load for long colmns.. Regenerators compared to the recuperators for the same dutyAnswer: Occupy more space Regenerators are used for waste heat recovery inAnswer: By-product coke ovens Which of the following furnaces will have maximum thermal efficiency ?Answer: Boiler furnace The tensile strength of plastics ranges from __________ kg/mm².Answer: 0.1 to 10 Heat transfer takes place through a liquid medium surrounding the submerged material under heating, in case of a/anAnswer: Salt bath furnace. The heating capacity of muffle furnace depends on theAnswer: Both (a) & (b) Which of the following is a batch furnace ?Answer: Cupola In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called theAnswer: Sankey diagram Ceramic tips for the cutting tool are prepared from __________ powder.Answer: Aluminium oxide Maximum thermal efficiency of boiler may be about __________ percent.Answer: 90 Rotary kilns are used in theAnswer: Both (a) and (b). The method of Lobo and Evans is concerned with the calculation of theAnswer: Heat absorption in radiant section of a furnace. Reverberatory furnace is used forAnswer: Roasting/reduction of ores Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about __________ percent.Answer: 25-30 In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place byAnswer: Radiation Which of the following is a directly fired intermittant furnace ?Answer: Reverberatory furnace Dampers are locatedAnswer: Before the I.D fan Protective gas used in the annealing furnace for steel coil comprises ofAnswer: 95% N₂+ 5% H₂ Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion ofAnswer: Blast furnace gas with air. Scaling of furnace stock is reduced by __________ in flue gas.Answer: All (a), (b) & (c) __________ furnace is not an electric furnace.Answer: Pot Forced recirculation of furnace gases is practisedAnswer: All (a), (b) and (c). Design of waste heat boiler for recovery of waste heat from furnace gases depends upon theAnswer: Quantity & temperature of waste gas. Air filtration in a furnaceAnswer: Reduces its thermal efficiency. Grain hardness is measured by the __________ hardness testing method.Answer: Knoop Which of the following is the most important deterrants to an extended use of pulverised coal in boiler firing ?Answer: Ash disposal problem. The thermal efficiency of a heat engine giving an output of 4 KW with an input of 10000 Joules/sec is __________ percent.Answer: 40 Which of the following is a periodic furnace?Answer: Soaking pit Which of the following alloying elements when added in steel does not improve its lachinability ?Answer: Copper