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Machine Design

Machine Design
According to Indian standards, total numbers of tolerance grades are

18
20
12
8

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (b/2a)]
σ [1 + (3a/b)]
σ [1 + (b/3a)]
σ [1 + (2a/b)]

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Machine Design
The rolling contact bearings as compared to sliding contact bearings have

Accuracy of shaft alignment
Small overall dimensions
Low starting and low running friction except at very high speeds
All of these

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Machine Design
Lewis equation is applied

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

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

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

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

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