491. The velocity factor for ordinary cut gears operating at velocities upto 12.5 m/s is equal to
✅ The correct answer is option B.
Machine Design MCQs
492. Multiple threads are used to secure
low efficiency
high efficiency
high load lifting capacity
high mechanical advant
✅ The correct answer is option B.
493. Guest’s theory is used for
brittle materials
ductile materials
elastic materials
plastic materials
✅ The correct answer is option B.
494. The surface finish factor for a mirror polished material is
0.45
0.65
0.85
1
✅ The correct answer is option D.
495. For a bevel gear having the pitch angle θ , the ratio of formative number of teeth (TE) to actual number of teeth (T) is
1/sin θ
1/cos θ
1/tan θ
sin θ cos θ
✅ The correct answer is option B.
496. The effective stress in wire ropes during normal working is equal to the stress due to
axial load plus stress due to bending
acceleration/retardation of masses plus stress due to bending
axial load plus stress due to acceleration/retardation
bending plus stress du
✅ The correct answer is option A.
497. A pressure vessel is said to be a thick shell, if the ratio of wall thickness to its diameter is
equal to 1/10
less than 1/10
greater than 1/10
none of these
✅ The correct answer is option C.
498. In worm gears, the pressure angle is half the angle between two inclined faces in axial plane.
Correct
Incorrect
✅ The correct answer is option A.
499. In radial bearings, the load acts __________ to the axis of rotation.
parallel
perpendicular
✅ The correct answer is option B.