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Machine Design

Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

W/A
W/2A
3W/A
2W/A

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Machine Design
Applications in which stresses are encountered in one direction only uses following type of threads

Acme
Metric
Buttress
Square

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Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Cold working
Grinding and lapping surface
Shot peening
Hot working

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Machine Design
A column of length l is fixed at both ends. The equivalent length of the column is

l/√2
2 l
l/2
l

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Machine Design
When two helical springs of equal lengths are arranged to form a cluster spring, then

Shear stress in each spring will be equal
Only A is correct
Both A and B is correct
Load taken by each spring will be half the total load

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Machine Design
The distribution of the forces along the length of key fitted in a shaft

Is uniform throughout
Varies exponentially, being more near the torque-input end
Varies exponentially, being less near the torque-input end
Varies linearly

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