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Machine Design

Machine Design
The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

d/6
d/8
d/2
d/4

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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
Lewis equation is applied

Only to the gear
To weaker of the pinion or gear
Only to the pinion
To stronger of the pinion or gear

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Machine Design
When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

2F/bh
F/bh
4F/bh
3F/2bh

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Machine Design
In standard taper roller bearings, the angle of taper of outer raceway is

15°
5°
25°
8°

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Machine Design
The radial distance from the __________ to the clearance circle is called working depth.

Dedendum circle
Pitch circle
None of these
Addendum circle

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