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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
0.4
0.33

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Machine Design
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

0.8 d
1.2 d
1.57 d
1.8 d

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Machine Design
The helix angle for double helical gears may be made up to

45°
60°
90°
75°

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Machine Design
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to

0.75/(0.75 + √v)
4.5/(4.5 + v)
3/(3 + v)
6/(6 + v)

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Machine Design
The design of shafts made of brittle materials is based on

Von Mises theory
Guest's theory
St Venant's theory
Rankine's theory

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)

⅟₂ × (P1 + P2)
[⅟₂ × (P1 + P2)] + Pc
P1 + P2
P1 - P2

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