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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3893. For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec.ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)

by
Di, opt = 3.9 Q0.45 ρ0.13
Di, opt = 3.9 Q0.45 . μ0.95
Di, opt = 4.7 Q0.36 . μ3.2ρ0.13
Di, opt = 3 Q0.36 . μ0.88
✅ The correct answer is option A.

3894. Commercial power generation from fusion reactor is not yet possible, because

by
it is difficult to control fusion reaction.
the fuel required (e.g. deuterium and tritium) is scarce.
it is difficult to initiate fusion reaction.
quantity of fuel required for initiating fusion reaction is prohibitively high.
✅ The correct answer is option A.

3896. Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher

by
melting point, hence can be subjected to higher temperature.
density ; hence core volume for a given power output would be smaller.
resistance to effects of irradiation.
all (a), (b) and (c).
✅ The correct answer is option D.