Engineering

Boost your preparation with the latest Engineering MCQs with answers and explanations. Our collection covers civil engineering, electrical engineering, mechanical engineering, electronics, software engineering, and other core subjects. These multiple-choice questions are designed for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, CSS, PMS, PEC exams, university entry tests, and job interviews. Practice online with updated Engineering MCQs to strengthen concepts, improve technical knowledge, and perform better in exams and recruitment tests.

📘 Chemical Engineering
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3974. When one of the fluids is highly corrosive and has fouling tendency, it should

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preferably flow inside the tube for its easier internal cleaning.
perferably flow outside the tube.
flow at a very slow velocity.
flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current.
✅ The correct answer is option A.

3975. A certain pressure vessel manufacturer avoids doing reinforcements calculations for openings by always providing a reinforcing pad extending upto double the diameter of the opening and of the same material and thickness as that of the shell wall. If area compensation is accepted as a code guideline, his approach leads to safe design

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only if the opening is on spherical vessel.
only if the opening is on a vertical cylinderical vessel.
only if the opening is on a horizontal cylinderical vessel.
irrespective of the shape of the vessel.
✅ The correct answer is option D.

3976. Weep holes provided in the plates of a distillation column

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facilitate draining out liquid from a tray when the unit is not in operation.
are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid.
must be large enough (usually 1/4″ to 5/8″ dia) to prevent plugging but should not deliver excessive amount of fluid during operation.
all (a), (b) and (c).
✅ The correct answer is option D.

3978. The necessary condition for phase equilibrium in a multiphase system of N components is that the

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A. Chemical potentials of a given component should be equal in all phases
B. Chemical potentials of all components should be same in a particular phase
C. Sum of the chemical potentials of any given component in all the phases should be the same
D. None of these
✅ The correct answer is option A.