0.528
0.546
0.577
0.582
✅ The correct answer is option A.
Mechanical Engineering MCQs
A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material.
smaller
greater
✅ The correct answer is option B.
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.
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.
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.
In petrol engines, advancing of the spark timing will __________ the knocking tendency.
not effect
decrease
increase
✅ The correct answer is option C.
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.
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.
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.
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.