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Machine Design

Machine Design
The spring mostly used in gramophones is

Conical spring
Flat spiral spring
Volute spring
Helical spring

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Machine Design
A V-belt designated as B 4430 LP has

4430 mm as centre distance between pulleys
4430 mm as nominal pitch length
4430 mm as diameter of small pulley
4430 mm as diameter of large pulley

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Machine Design
If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

1.25 × diameter of bolt
0.75 × diameter of bolt
Diameter of bolt
1.5 × diameter of bolt

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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)

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

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Machine Design
The ball bearings are provided with a cage

To prevent the lubricant from flowing out
To facilitate slipping of balls
To maintain the balls at a fixed distance apart
To reduce friction

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Machine Design
The included angle in unified of American National threads is

47°
29°
55°
60°

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