3681. High speed steel drills can be operated at about __________ the speed of high carbon steel drills.
one-half
one-fourth
double
four times
✅ The correct answer is option C.
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.
3682. The moment of inertia of a thin rod of mass m and length l,about an axis through its centre of gravity and perpendicular to its length is
ml2/4
ml2/ 6
ml2/8
ml2/12
✅ The correct answer is option D.
3683. A shaft has two heavy rotors mounted on it. The transverse natural frequencies, considering each of the rotor separately, are 100 Hz and 200 Hz respectively. The lowest critical speed is
5367 r.p.m.
6000 r.p.m.
9360 r.p.m.
12000 r.p.m.
✅ The correct answer is option A.
3684. Lancing is the operation of
cutting a sheet of metal in a straight line along the length
removal of metal to the desired shape from the edge of a plate
cutting a sheet of metal through part of its length and then bending the cut portion
bending a sheet of met
✅ The correct answer is option C.
3685. The essential constituent of a hardened steel is
pearlite
austenite
martensite
troostite
✅ The correct answer is option C.
3686. A low wet bulb temperature indicates very __________ humidity.
low
high
✅ The correct answer is option A.
3687. The total energy of a molecule is shared equally by the various degrees of freedom possessed by it. This law is known as
law of equipartition of energy
law of conservation of energy
law of degradation of energy
none of these
✅ The correct answer is option A.
3688. Cut-off governing as compared to throttle governing is
less efficient and less economical
less efficient and more economical
more efficient and less economical
more efficient and mor
✅ The correct answer is option D.
3689. In a gas welding of mild steel using an oxy-acetylene flame, the total amount of acetylene consumed is 10 litre. The oxygen consumption from the cylinder is
5 litre
10 litre
15 litre
20 litre
✅ The correct answer is option B.
3690. The upper critical point varies according to the carbon content in steel.
TRUE
FALSE
✅ The correct answer is option A.