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Machine Design

Machine Design
The gears are termed as medium velocity gears, if their peripheral velocity is

3-15 m/s
15-30 m/s
1-3 m/s
30-50 m/s

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Machine Design
The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)

p = D sin (180°/T)
p = D sin (120°/T)
p = D sin (90°/T)
p = D sin (360°/T)

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Machine Design
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

Same in both cases
4 times more
3 times more
2 times more

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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/σt
pd/2σt
pd/3σt
pd/4σt

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Machine Design
The objective of caulking in a riveted joint is to make the joint

Free from stress
Leak-proof
Stronger in tension
Free from corrosion

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Machine Design
In Vickers hardness testing, the pyramid indentor apex is

136°
152°
40°
122°

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