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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)

3 d
2 d
5 d
4 d

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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

8
2
16
4

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

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

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Machine Design
A compound cylinder with inner radius 50 mm and outer radius 70 mm is made by shrinking one cylinder on to the other cylinder, the junction radius is 60 mm and the junction pressure is 1.1 N/mm². The maximum hoop stress developed in the inner cylinder is

7.2 N/mm² tension
3.6 N/mm² tension
3.6 N/mm² compression
7.2 N/mm² compression

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Machine Design
Multiple threads are used to secure

High efficiency
Low efficiency
High mechanical advantage
High load lifting capacity

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Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

4F/ πd²
6F/ πd²
8F/ πd²
16F/ 3πd²

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