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.

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4121. Pick out the wrong statement about the design of a sieve plate column.

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An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns.
For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design.
Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns.
Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds.
✅ The correct answer is option D.

4123. For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

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decreases upwards.
increases upwards.
remains same throughout.
may decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell.
✅ The correct answer is option A.

4124. In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

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results in higher shell side pressure drop.
can accomodate less number of tubes for a given shell diameter.
facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid.
creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient.
✅ The correct answer is option A.