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Machine Design

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

45°
90°
22.5°
67.5°

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Machine Design
A locking device extensively used in marine type connecting rod ends is a

Castle nut
Ring nut
Jam nut
Sawn nut

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Machine Design
An elastic bar is fixed at the upper end and loaded at the lower end by a falling weight. The shock load produced can be reduced by

Increasing the length of bar
Decreasing the modulus of elasticity of the bar
Decreasing the cross-sectional area of the bar
All of these

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Machine Design
In leaf springs, the longest leaf is known as

None of these
Lower leaf
Master leaf
Upper leaf

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Machine Design
The stress in the threaded part of the bolt will be __________ as compared to the shank.

None of these
Same
Lower
Higher

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Machine Design
The ratio of belt tensions (p1/p2) considering centrifugal force in flat belt is given byWhere m = mass of belt per meter (kg/m)v = belt velocity (m/s)f = coefficient of frictiona = angle of wrap (radians)

P1 / P2 = eᶠα
(P1 - mv²)/ (P2 - mv²) = e–ᶠα
(P1 - mv²)/ (P2 - mv²) = eᶠα
P1 / P2 = e–ᶠα

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