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Machine Design

Machine Design
In a flange coupling, the flanges are coupled together by means of

Studs
Bolts and nuts
Headless taper bolts
None of these

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Machine Design
The bending stress in a curved beam is

None of these
Maximum at the neutral axis
Zero at the point other than centroidal axis
Zero at the centroidal axis

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given byWhere m = mass of belt per meter (kg/m)v = belt velocity (m/s)f = coefficient of frictiona = angle of wrap (radians)

P1 / P2 = eᶠα
P1 / P2 = e–ᶠα
(P1 - mv²)/ (P2 - mv²) = eᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα

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Machine Design
According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

1.875 × (π/4) d² × τ × n
3 × (π/4) d² × τ × n
(π/4) d² × τ × n
2 × (π/4) d² × τ × n

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Machine Design
A double fillet welded joint with parallel fillet weld of length 'l' and leg 's' is subjected to a tensile force 'P'. Assuming uniform stress distribution, the shear stress in the weld is given by

P/√2.s.l
√2P/s.l
P/2.s.l
2P/s.l

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Machine Design
When bevel gears connect two shafts whose axes intersect at an angle greater than a right angle and one of the bevel gears has a pitch angle of 90°, then they are known as

Mitre gears
Crown bevel gears
Angular bevel gears
Internal bevel gears

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