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Machine Design

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

Less
None of these
Same
More

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Machine Design
For a bevel gear having the pitch angle θ, the ratio of formative number of teeth (TE) to actual number of teeth (T) is

1/tanθ
1/cosθ
1/sinθ
sinθ cosθ

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Machine Design
A shaft is subjected to

Bending stresses
All of these
Combined bending and shear stresses
Shear stresses

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Machine Design
The design of shafts made of brittle materials is based on

Rankine's theory
Von Mises theory
St Venant's theory
Guest's theory

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Machine Design
If two springs are in parallel then their overall stiffness will be

Half
None of these
Double
Same

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Machine Design
Which process will increase the fatigue duration of parts?

Electroplating
De-carburisation
Shot-peening
Finishing and polishing

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