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Machine Design

Machine Design
The ratio of endurance limit in shear to the endurance limit in flexure is

0.5
0.55
0.33
0.4

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Machine Design
The groove angle of pulleys for V-belt is

340 to 360
More than 400
300 to 320
420 to 450

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Machine Design
The ultimate strength of steel in tension in comparison to shear is in the ratio of

0.12638888888889
0.085416666666667
0.042361111111111
0.084027777777778

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Machine Design
In a multiple V-belt drive, when a single belt is damaged, it is preferable to change the complete set in order to

Ensure proper alignment
Ensure uniform loading
Reduce slip
Reduce vibration

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

29°
55°
60°
47°

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Machine Design
When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

One-half
Same
One-fourth
Double

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