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Machine Design

Machine Design
The rivet head used for boiler plate riveting is usually

Counter sunk head
Snap head
Pan Head
Conical head

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Machine Design
The difference between the upper limit and lower limit of a dimension is called

Tolerance
Actual size
Nominal size
Basic size

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Machine Design
In order to obtain bolt of uniform strength

Increase shank diameter
Increase its length
Tighten die bolt properly
Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread

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

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Machine Design
The distribution of the forces along the length of key fitted in a shaft

Is uniform throughout
Varies exponentially, being more near the torque-input end
Varies exponentially, being less near the torque-input end
Varies linearly

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Machine Design
A shaft is subjected to a maximum bending stress of 80 N/mm² and maximum shearing stress equal to 30 N/mm² at a particular section. If the yield point in tension of the material is 280 N/mm² and the maximum shear stress theory of failure is used, then the factor of safety obtained will be

3.0
2.5
3.5
2.8

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