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Machine Design

Machine Design
In designing a flange coupling, the pitch circle diameter of bolts is taken as (where d = Diameter of the shaft)

5 d
4 d
3 d
2 d

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Machine Design
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as

Flat saddle key
Wood ruff key
Gib-head key
Feather key

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

0.085416666666667
0.12638888888889
0.084027777777778
0.042361111111111

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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

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

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Machine Design
While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

Both the ends fixed
One end fixed and the other end free
One end fixed and the other end hinged
Both the ends hinged

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Machine Design
A universal coupling is used to connect two shafts

Which are perfectly aligned
Have lateral misalignment
Which are not in exact alignment
Whose axes intersect at a small angle

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