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Machine Design

Machine Design
Two shafts of the same length and material are joined in series. If the ratio of their diameters is 2, then the ratio of their angles of twist will be

2
8
16
4

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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
Double
Same
One-fourth

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Machine Design
Surface endurance limit of gear material is dependent upon its

Brinell hardness number
Elastic strength
Toughness
Yield strength

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

0.084027777777778
0.042361111111111
0.085416666666667
0.12638888888889

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Machine Design
Crushing resistance required to crush the rivet per pitch length is

p.d.σc
p.t.σc
n.d.t.σc
(p - d) t.σc

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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

1.8 d
1.2 d
0.8 d
1.57 d

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