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Machine Design

Machine Design
Rankine's theory is used for

Plastic materials
Ductile materials
Elastic materials
Brittle materials

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Machine Design
Screws used for power transmission should have

Low efficiency
High efficiency
Strong teeth
Very fine threads

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Machine Design
If a bearing is designated by the number 305, it means that the bearing is of

Light series whose bore is 5 mm
Medium series whose bore is 5 mm
Medium series whose bore is 25 mm
Light series whose bore is 25 mm

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Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (2a/b)]
σ [1 + (3a/b)]
σ [1 + (b/2a)]
σ [1 + (b/3a)]

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

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

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Machine Design
When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

2W/A
3W/A
W/A
W/2A

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