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.

📘 Automobile Engineering MCQs

📘 Compressors, Gas Dynamics and Gas Turbines MCQs

📘 Engineering Materials MCQs

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📘 Heat Transfer, Refrigeration and Air Conditioning MCQs

📘 Hydraulic Machines MCQs

📘 Hydraulics and Fluid Mechanics MCQs

📘 IC Engines and Nuclear Power Plants MCQs

📘 Industrial Engineering and Production Management MCQs

📘 Machine Design MCQs

📘 Production Engineering MCQs

📘 Steam Boilers and Engines MCQs

📘 Steam Nozzles and Turbines MCQs

📘 Strength of Materials MCQs

📘 Theory of machines MCQs

📘 Thermodynamics MCQs

📘 topics MCQs

📘 Workshop Technology MCQs

1631. The fuel pump of a programmed fuel injection (PFI) system operate for two seconds when the ignition is turned to the start position to

enable the pump’s fault-diagnosis function to operate

warm up and lubricate the pump

supply a large amount of fuel and thereby create a choke effect

pressurise the fuel sy

✅ The correct answer is option D.

1632. In case of an under-reinforced beam, the depth of actual neutral axis is __________ that of the critical neutral axis.

same as

less than

greater than

✅ The correct answer is option B.

1633. According to Kelvin-Planck’s statement, a perpetual motion of the __________ is impossible.

first kind

second kind

✅ The correct answer is option B.

1634. For no tension condition in the base of a short column of circular section, the line of action of the load should be within a circle of diameter equal to __________ of the main circle.

one-half

one-third

one-fourth

one-eighth

✅ The correct answer is option C.

1635. The total strain energy stored in a body is termed as

resilience

proofresilience

impact energy

modulus of resilience

✅ The correct answer is option A.

1636. The values of equivalent length (L) and actual length (l) of a column for both ends hinged is the same

Yes

No

✅ The correct answer is option A.

1637. According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through centre of gravity (i.e. IP) is given by(where, A = Area of the section, IG = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)

IP = IG + Ah2

IP = IG – Ah2

IP = IG / Ah2

IP = Ah2 / IG

✅ The correct answer is option A.

1638. The advantage of having a tandem master cylinder arrangement in automobiles is that it

enhances safety by serving two independent lines in a divided-line brake circuit

enhances safety by activating the brakes using vacuum pressure in the event of brake fluid loss

supplies equal fluid pressure to each line of a divided-line brake circuit, thereby preventing the brakes from dragging on one side

boosts the brake fluid

✅ The correct answer is option A.

1639. The normal heptane (C7H16) is given a rating of __________ octane number.

0

50

100

120

✅ The correct answer is option A.

1640. Which one of the following statements correctly describes the construction of a planetary gear type differential ?

The six planetary pinions rotate in constant mesh with the internal gears.

One drive shaft is splined to the central gear and the other to the planetary gear.

Each planetary pinion gear meshes with both the central gear and the internal gear.

The internal gear is f

✅ The correct answer is option B.