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Machine Design

Machine Design
The constant factor in case of R10 series of preferred numbers is

1.06
1.12
1.58
1.26

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Machine Design
The endurance limit for a mirror polished material will be __________ as compared to unpolished material.

None of these
Same
More
Less

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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

6F/ πd²
8F/ πd²
16F/ 3πd²
4F/ πd²

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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
0.5 d
1.25 d
0.75 d

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Machine Design
The shear modulus of resilience is proportional to

(Shear stress)²
(Shear stress)3
(Shear stress)⁴
Shear stress

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Machine Design
For a square key made of mild steel, the shear and crushing strength are related as

Shear strength is equal to crushing strength
Shear strength is greater than crushing strength
Shear strength is less than crushing strength
None of these

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