Machine Design
The endurance limit of a material with finished surface in comparison to rough surface is

Less
Same
More or less depending on quantum of load
More

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Machine Design
In case of V belt drive

The belt should touch the bottom of groove in the pulley
None of these
The belt should not touch the sides of groove in the pulley
The belt should not touch the bottom of groove in the pulley

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Machine Design
Form coefficient of spring is

Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Its capability of storing energy
Concerned with strength of wire of spring

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Machine Design
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

Equating shearing resistance to the crushing resistance of the rivets
None of these
Equating tearing resistance of the plate to the crushing resistance of the rivets
Equating tearing resistance of the plate to the shearing resistance of the rivets

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Machine Design
Turn buckle has

Right hand threads on bout ends
Left hand threads on both ends
No threads
Left hand threads on one end and right hand threads on other end

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