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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4191. A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

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is economical in operation.
employs high velocity, high heat transfer rate and less heating surface requirement.
employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle.
both (b) & (c).
✅ The correct answer is option D.

4193. Pick out the wrong statement:

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The tensile strength of a brittle material is less than its compressive strength.
The compressive strength of a ductile materia] is less than its tensile strength.
In a thick cylindrical shell, the hoop stress is maximum at the inner radius.
The value of crushing load is more than that of buckling load for long colmns.
✅ The correct answer is option D.

4197. Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.

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It is unsuitable for concentrating those liquids, which form a scale or deposit salt.
It is suitable for process, in which the final product is a liquor instead of solid.
Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres.
Liquor flows inside the tube, while the steam is outside submerging the tube.
✅ The correct answer is option D.

4198. The wall thickness for a large high pressure pipeline is determined by the consideration of the

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axial tensile stress in the pipe.
forces exerted by static and dynamic action at bends.
circumferential pipewall tension.
temperature stresses.
✅ The correct answer is option C.

4200. In a vertical short tube evaporator (Calendria type), the

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tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used.
area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube.
liquor is inside the tube while the steam is outside the tube.
all (a), (b) & (c).
✅ The correct answer is option D.