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Machine Design

Machine Design
The ratio of endurance limit in shear to the endurance limit in flexure is

0.55
0.33
0.4
0.5

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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 (neglecting centrifugal tension) will be equal to (Where, Pc is centrifugal tension)

P1 - P2
⅟₂ × (P1 + P2)
[⅟₂ × (P1 + P2)] + Pc
P1 + P2

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Machine Design
A thin spherical shell of internal diameter d is subjected to an internal pressure p. If σt is the tensile stress for the shell material, then thickness of shell is equal to

pd/3σt
pd/σt
pd/2σt
pd/4σt

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Machine Design
Pick up wrong statement. Fatigue strength can be increased by

Grinding and lapping surface
Cold working
Shot peening
Hot working

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Machine Design
In V-belt drive, belt touches

At bottom
Both at bottom and sides
At sides only
Could touch anywhere

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

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

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