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Machine Design

Machine Design
In a marine flange coupling, the thickness of flange is taken as

d/3
3d/4
d/2
d/4

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Machine Design
The taper on cotter varies from

1 in 15 to 1 in 10
1 in 24 to 1 in 20
1 in 48 to 1 in 24
1 in 32 to 1 in 24

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

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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

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

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Machine Design
In the assembly of pulley, key and shaft

Key is made the strongest
Pulley is made the weakest
Key is made the weakest
All the three are designed for equal strength

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Machine Design
Failure of a material is called fatigue when it fails

Below the elastic limit
At the yield point
At the elastic limit
Below the yield point

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