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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5111. In a single acting reciprocating compressor, the suction, compression and delivery of air takes place in __________ of the piston.

[A]. one stroke

[B]. two strokes

[C]. three strokes

[D]. four strokes

✅ The correct answer is option B.

5112. Crystal structure of a material is, generally, examined by

[A]. naked eye

[B]. optical microscope

[C]. metallurgical microscope

[D]. X-ray techniques

✅ The correct answer is option D.

5113. two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. It the line of action of the resultant is 6 mm from any given force, the two forces are

[A]. 15 N and 5 N

[B]. 20 N and 5 N

[C]. 15 N and 15 N

[D]. none of these

✅ The correct answer is option A.

5114. A redundant frame is also called __________ frame.

[A]. perfect

[B]. imperfect

[C]. deficient

null

✅ The correct answer is option B.

5115. A body will begin to move down an inclined plane if the angle of inclination of the plane is __________ the angle of friction.

[A]. equal to

[B]. less than

[C]. greater than

null

✅ The correct answer is option C.

5116. The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)

[A]. Q = Cd x b2g(H2 – H1)

[B]. Q = Cd x b2g(H21/2 – H11/2)

[C]. Q = Cd x b2g(H23/2 – H13/2)

[D]. Q = Cd x b2g(H22 – H12)

✅ The correct answer is option C.

5117. According to Gay-Lussac law for a perfect gas, p/T = constant, if v is kept constant.

[A]. True

[B]. False

null

null

✅ The correct answer is option A.

5118. The velocity ratio in case of an inclined plane inclined at angle θ to the horizontal and weight being pulled up the inclined plane by vertical effort is

[A]. sin θ

[B]. cos θ

[C]. tan θ

[D]. cosec θ

✅ The correct answer is option A.

5119. A systematic job improvement sequence will consist of

[A]. motion study

[B]. time study

[C]. job enrichment

[D]. all of these

✅ The correct answer is option D.

5120. The Bernoulli’s equation is based on the assumption that

[A]. there is no loss of energy of the liquid flowing

[B]. the velocity of flow is uniform across any cross-section of the pipe

[C]. no force except gravity acts on the fluid

[D]. all of the above

✅ The correct answer is option D.