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Machine Design

Machine Design
When a bolt and nut is made of mild steel, then the effective height of nut is made equal to (where d = Nominal diameter of bolt)

d
0.75 d
0.5 d
1.25 d

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Machine Design
The endurance limit of a material with finished surface in comparison to rough surface is

Less
Same
More
More or less depending on quantum of load

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Machine Design
When two non-parallel or intersecting but coplanar shafts are connected by gears, the arrangement is known as,

Worm gearing
Bevel gearing
Helical gearing
None of these

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Machine Design
A key made from a cylindrical disc having segmental cross-section, is known as

Feather key
Gib head key
Flat saddle key
Woodruff key

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Machine Design
The resultant axial load on a bolt depends upon

All of these
External load applied
Relative elastic yielding of the bolt and the connected members
Initial tension due to tightening of the bolt

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Machine Design
The velocity factor for precision metallic gears cut with high accuracy and operating at velocities up to 20 m/s is equal to

6/ (6 + v)
3/ (3 + v)
4.5/ (4.5 + v)
0.75/ (0.75 + √v)

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