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Machine Design

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

55°
47°
60°
29°

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Machine Design
The centre to centre distance between two consecutive rivets in a row, is called

Back pitch
Pitch
Margin
Diagonal pitch

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Machine Design
For a bevel gear having the pitch angle θ, the ratio of formative number of teeth (TE) to actual number of teeth (T) is

1/cosθ
1/tanθ
sinθ cosθ
1/sinθ

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Machine Design
The radial distance of a tooth from the pitch circle to the top of the tooth is called

Working depth
Dedendum
Addendum
Clearance

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

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

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Machine Design
According to I.B.R., the distance between the rows of rivets, for equal number of rivets in more than one row for lap joint or butt joint (chain riveting) shall not be less than

2.5 d
d
1.5 d
2 d

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