2621. In a stress-strain diagram for mild steel, as shown in the below figure, the point A represents
elastic limit
upper yield-point
lower yield point
breaking point
✅ The correct answer is option A.
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.
2622. A system of masses rotating in different parallel planes is in dynamic balance if the
resultance force is equal to zero
resultant couple is equal to zero
resultant force and resultant couple are both equal to zero
resultant force is num
✅ The correct answer is option C.
2623. Modulus of rigidity may be defined as the ratio of
linear stress to lateral strain
lateral strain to linear strain
linear stress to linear strain
shear stress to shear
✅ The correct answer is option D.
2624. The stroke of an engine is the
volume of the cylinder
length of the connecting rod
internal diameter of the cylinder
distance between T.D.C
✅ The correct answer is option D.
2625. Which of the following gives the correct order of increasing hot hardness of cutting tool materials?
Diamond, Carbide, High speed steel
Carbide, Diamond, High speed steel
High speed steel, Carbide, Diamond
High speed steel, Diam
✅ The correct answer is option C.
2626. In petrol engines, the delay period is of the order of
0.001 second
0.002 second
0.003 second
0.004 second
✅ The correct answer is option B.
2627. The absolute pressure of air at the outlet of a compressor is called
back pressure
critical pressure
discharge pressure
none of these
✅ The correct answer is option C.
2628. In an orthogonal cutting, the depth of cut is halved and the feed rate is double. If the chip thickness ratio is unaffected with the changed cutting conditions, the actual chip thickness will be
doubled
halved
quadrupled
unchanged
✅ The correct answer is option A.
2629. The ignition quality of petrol is expressed by
cetane number
octane number
calorific value
all of these
✅ The correct answer is option B.
2630. The path taken by intake air is
carburettor (or throttle body) – air cleaner – intake manifold – intake ports – cylinders
air cleaner – carburettor (or throttle body) -intake ports – intake manifold – cylinders
air cleaner – intake manifold – carburettor (or throttle body) – intake ports – cylinders
air cleaner – carburet
✅ The correct answer is option D.