Basic Chemical Engineering MCQs

Practice Basic Chemical Engineering MCQs with answers and explanations to prepare for exams, interviews, and job tests. Our question bank covers fundamental topics such as units and dimensions, material and energy balances, fluid mechanics, thermodynamics, heat transfer, mass transfer, and chemical process basics. These multiple-choice questions are designed for students, fresh graduates, and competitive exam aspirants preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and recruitment assessments. Strengthen your core concepts and problem-solving skills with our updated Basic Chemical Engineering MCQs.

793. The temperature at which a gas, when subjected to Joule-Thomson expansion, neither cools or heats up, is termed as the __________ temperature. Above this temperature the gas heats up on throttling and below this the gas cools down.

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A. Isotactic
B. Saturation
C. Inversion
D. Throttling
✅ The correct answer is option C.

794. What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ?

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A. It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water
B. Economiser tube life increases due to handling of low temperature water
C. Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases
D. Scale formation rate on economiser tubes increases
✅ The correct answer is option A.