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Machine Design

Machine Design
Rankine Gordon formula for buckling is valid for

Short and long column
Short column
Very long column
Long column

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Machine Design
When a beam of rectangular cross-section of width b and depth d, is subjected to a shear force F, the maximum shear stress induced will be

3F/2bh
2F/bh
F/bh
4F/bh

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Machine Design
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

Decreasing the cross-section area of bar
Increasing the cross-section area of bar
Would depend upon other factors
Remain unaffected with cross-section area

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Machine Design
When compared to the rod of the same diameter and material, a wire rope

Provides much greater time for remedial action before failure
Has a much smaller load carrying capacity
Does not provide much warning before failure
Is less flexible

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Machine Design
According to I.B.R., shearing resistance required to shear off the rivet per pitch length (in double shear) is (where n = Number of rivets per pitch length)

(π/4) d² × τ × n
1.875 × (π/4) d² × τ × n
3 × (π/4) d² × τ × n
2 × (π/4) d² × τ × n

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Machine Design
When a close coiled helical spring is compressed, its wire is subjected to

Compression
Tension
All of these
Shear

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