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Machine Design

Machine Design
In order to permit the thermal expansion/contraction of tubing, it should be

Flared
Bent
Honed
Crimped

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Machine Design
According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

d = 2√t
d = 1.6√t
d = 6√t
d = √t

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

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Machine Design
Stress concentration in static loading is more serious in

Depends on other factors
Ductile materials
Brittle materials
Equally serious in both cases

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Machine Design
According to I.B.R., the efficiency of a double riveted butt joint with double cover straps of equal width should be

80 to 90%
63 to 70%
45 to 60%
70 to 83%

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Machine Design
The helix angle for double helical gears may be made up to

75°
60°
45°
90°

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