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Machine Design

Machine Design
The included angle for the British Association thread is

47.3°
29°
55°
60°

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Machine Design
For general industrial machinery, the ratio of the length of journal to its diameter is taken as

3 to 5
5 to 10
0.5 to 1
1 to 2

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Machine Design
A spring of stiffness 1000 N/m is stretched initially by 100 mm from the undeformed position. The work required to stretch it by another 100 mm is

10 N-m
5 N-m
15 N-m
7 N-m

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Machine Design
In V-belt drive, belt touches

At bottom
At sides only
Both at bottom and sides
Could touch anywhere

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Machine Design
Auto frettage is the method of

Pre-stressing thick cylinders
Calculating stresses in thick cylinders
Joining thick cylinders
Increasing the life of thick cylinders

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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)

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

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