⚗️ 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

__________ can not be forged.Answer: Cast iron Thickness of stock does not affect the fuel economy of furnaces, if the material to be heated is ofAnswer: Neither (a) nor (b) Ceramic recuperators compared to metallic recuperators for the same dutyAnswer: Occupy more space. In order to maintain a reducing atmosphere in a furnace, it should haveAnswer: CO in flue gas Which is the most thermally efficient furnace ?Answer: Boiler furnace The heat recoverable from flue gases of furnaces depends on theAnswer: All (a), (b) and (c). Ceramic recuperators (made of SiC) is economical, only when used for preheating combustion air above __________ °C.Answer: 650 Which is a continuous furnace ?Answer: Glass tank furnace Material having maximum density isAnswer: Osmium Which of the following is the most suitable for preheating combustion air above 650°C ?Answer: Ceramic recuperator Soaking pits are meant for heating steelAnswer: Ingots The purpose of controlling the furnace atmosphere is to prevent surface attack byAnswer: Either of the above Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.Answer: 40 Which of the following is not found in iron-carbon equilibrium diagram ?Answer: Curie point In producer gas making furnace, steam is added along with air to mainly control theAnswer: Tar content in producer gas. Which of the following metals can not be extracted by pyrometallurgical process from its sulphide ore?Answer: Mercury Fuel used in B.F. stove isAnswer: Blast furnace gas/mixed gas Nitrogen compounds are not used in the manufacture ofAnswer: Tip of match sticks Tunnel kilns are usually used forAnswer: Drying/tempering of refractories. Stellite is a trade name for theAnswer: Non-ferrous cast alloys. The thermal efficiency of a steel slab reheating furnace (walking beam type) may be about __________ percent.Answer: 40 Needles are produced byAnswer: Swaging Higher furnace temperature can not be achieved by use of a lean fuel gas in the furnace byAnswer: Increasing the draft in the furnace. preheating the fuel gas. Aromatics are desired constituents ofAnswer: Petrol Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased byAnswer: All (a), (b) & (c). Galvanic corrosionAnswer: Occurs in a bimetal couple. Ceramic coating material for furnace refractory, which increases its emissivity and thus the radiation heat transfer rate in the furnace, comprises ofAnswer: Zircon powder Increasing the temperature of a material makes itAnswer: Softer In reverberatory furnace, charge is heated mainly byAnswer: Radiation of heat from the roof of the combustion chamber. Which of the following absorbs maximum heat in a high pressure boiler ?Answer: Furnace water wall