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Machine Design

Machine Design
The lead angle of a worm is 22.5°. Its helix angle will be

90°
45°
67.5°
22.5°

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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

d
1.5 d
2.5 d
2 d

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Machine Design
When spring index increases, the value of Wahl's stress factor

Increases linearly
Decreases linearly
Remains same
Increases exponentially

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Machine Design
A double strap butt joint (with equal straps) is

Any one of these
Always in double shear
Either in single shear or double shear
Always in single shear

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Machine Design
The ratio of the ultimate stress to the design stress is known as

Factor of safety
Elastic limit
Strain
Bulk modulus

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Machine Design
The included angle for the British standard whitworth thread is

47.5°
60°
29°
55°

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