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Machine Design

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

122°
40°
136°
152°

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Machine Design
The largest diameter of an external or internal screw thread is known as

Minor diameter
None of these
Major diameter
Pitch diameter

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

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Machine Design
A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

Castle nut
Sawn nut
Ring nut
Jam nut

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

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Machine Design
The coefficient of friction in belt drive depends upon

Belt velocity
Material of belt
Materials of belt and pulley
Material of pulley

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