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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5161. The temperature at which the new grains are formed in the metal is called

[A]. lower critical temperature

[B]. upper critical temperature

[C]. eutectic temperature

[D]. recrystallisation temperature

✅ The correct answer is option D.

5162. A push broach as compared to pull broach

[A]. has less number of teeth

[B]. is short and stocky

[C]. removes less material for each pass of the tool

[D]. all of the above

✅ The correct answer is option D.

5163. The efficiency of a centrifugal pump will be maximum when the blades are bent backward.

[A]. Yes

[B]. No

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null

✅ The correct answer is option A.

5164. In full annealing, the hypo-eutectoid steel is heated from 30° C to 50° C above the upper critical temperature and then cooled

[A]. in still air

[B]. slowly in the furnace

[C]. suddenly in a suitable cooling medium

[D]. any one of these

✅ The correct answer is option B.

5165. When the gas is heated at constant volume, the heat supplied increases the internal energy of the gas.

[A]. True

[B]. False

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null

✅ The correct answer is option A.

5166. Which of the following methods can be used for manufacturing 2 metre long seamless metallic tubes?

[A]. Drawing

[B]. Extrusion

[C]. Rolling

[D]. Extrusion and rolling

✅ The correct answer is option D.

5167. The discharge of a centrifugal pump working under constant head __________ with the speed.

[A]. increases

[B]. decreases

null

null

✅ The correct answer is option A.

5168. When a rigid body is suspended vertically, and it oscillates with a small amplitude under the action of the force of gravity, the body is known as

[A]. simple pendulum

[B]. compound pendulum

[C]. torsional pendulum

[D]. second’s pendulum

✅ The correct answer is option B.

5169. The ratio of the useful heat drop to the isentropic heat drop is called

[A]. condenser efficiency

[B]. nozzle efficiency

[C]. boiler efficiency

[D]. vacuum efficiency

✅ The correct answer is option B.

5170. During elastic impact, the relative velocity of the two bodies after impact is __________ the relative velocity of the two bodies before impact.

[A]. equal to

[B]. equal and opposite to

[C]. less than

[D]. greater than

✅ The correct answer is option B.