Mechanical Engineering

Prepare with the best Mechanical Engineering MCQs with answers and explanations for exams, interviews, and job tests. Our collection covers core topics such as engineering mechanics, thermodynamics, strength of materials, theory of machines, fluid mechanics, heat transfer, manufacturing processes, machine design, and power plant engineering. These Mechanical Engineering multiple-choice questions are designed for students, fresh graduates, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and recruitment assessments. Strengthen your technical knowledge and problem-solving ability with our updated and comprehensive Mechanical Engineering MCQs.

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5253. An adiabatic process is one in which

[A]. no heat enters or leaves the gas
[B]. the temperature of the gas changes
[C]. the change in internal energy is equal to the mechanical workdone
[D]. all of the above
✅ The correct answer is option D.

5258. Which of the following statement is correct for a compound steam engine ?

[A]. The cost of the engine, for the same power and economy, is more than that of a simple steam engine.
[B]. The forces in the working parts are increased as the forces are distributed over more parts.
[C]. The ratio of expansion is reduced, thus reducing the length of stroke.
[D]. The temperature range per cylinder is increased, with corresponding increase in condensation.
✅ The correct answer is option C.

5259. Work done is said to be zero, when

[A]. some force acts on a body, but displacement is zero
[B]. no force acts on a body but some displacement takes place
[C]. either (a) or (b)
[D]. none of the above
✅ The correct answer is option C.
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