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Machine Design

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

None of these
More
Less
Same

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Machine Design
The square threads are usually found on

Spindles of bench vices
Screw cutting lathes
Feed mechanism of machine tools
Railway carriage couplings

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Machine Design
All stresses produced in a belt are

Shear stresses
Tensile stresses
Compressive stresses
Both tensile and compressive stresses

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Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

P1 + P2
[(√P1 + √P2)/2]²
⅟₂× (P1 + P2)
[⅟₂ × (P1 + P2)] + Pc

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Machine Design
The dedendum circle diameter is equal to (where φ = Pressure angle)

Pitch circle diameter × sinφ
Pitch circle diameter × cosφ
Addendum circle diameter × cosφ
Clearance circle diameter × cosφ

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Machine Design
Buttress threads are usually found on

Spindles of bench vices
Feed mechanisms
Screw cutting lathes
Railway carriage couplings

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