4311. During cold working process
grain structure is distorted
strength and hardness of metal increases
close dimensional tolerance can be maintained
all of the above
✅ The correct answer is option D.
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.
4312. The coriolis component of acceleration is taken into account for
slider crank mechanism
four bar chain mechanism
quick return motion mechanism
all of these
✅ The correct answer is option C.
4313. The octane number of petrol, generally available, is
20 to 40
40 to 60
60 to 80
80 to 100
✅ The correct answer is option D.
4314. In petrol engines, advancing of the spark timing will __________ the knocking tendency.
not effect
decrease
increase
✅ The correct answer is option C.
4315. When a medium carbon steel is heated to coarsening temperature,
there is no change in grain size
the average grain size is a minimum
the grain size increases very rapidly
the grain size first i
✅ The correct answer is option C.
4316. In a single stage, single acting reciprocating air compressor, without clearance volume, the workdone is minimum during
isothermal compression
isentropic compression
polytropic compression
none of these
✅ The correct answer is option A.
4317. Which of the following bladings will give maximum pressure rise in a centrifugal compressor, assuming the same overall dimensions, blade inlet angle and rotational speeds ?
Forward curved blades
Backward curved blades
Radial blades
all of these
✅ The correct answer is option A.
4318. A PERT network has three activities on critical path with mean time 3, 8 and 6 and standard deviations 1, 2 and 2 respectively. The probability that the project will be completed in 20 days is
0.5
0.66
0.84
0.95
✅ The correct answer is option C.
4319. One stoke is equal to
10-2 m2/s
10-3 m2/s
10-4 m2/s
10-6 m2/s
✅ The correct answer is option C.
4320. In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is
cylindrical grinder
internal grinder
surface grinder
tool and cutter grinde
✅ The correct answer is option C.