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Machine Design

Machine Design
The ratio of endurance limit in shear to the endurance limit in flexure is

0.5
0.55
0.4
0.33

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Machine Design
The bearings of heavy series have capacity __________ over the medium series.

40 to 50%
30 to 40%
10 to 20%
20 to 30%

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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)

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

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Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

90°
22.5°
45°
67.5°

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Machine Design
For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)

4μ sinθ/(2θ + sin 2θ)
4μ sinθ/(θ + sinθ)
μ sinθ/(2θ + sin 2θ)
2μ sinθ/(θ + sinθ)

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Machine Design
A single strap butt joint is always in __________ shear.

Single
None of these
Triple share
Double

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