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

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

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Machine Design
Spring index is

Indication of quality of spring
Ratio of coil diameter to wire diameter
Load required to produce unit deflection
Its capability of storing energy

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Machine Design
In composite or reverse laid ropes

Direction of twist of wires and strands are same
Direction of twist of wires in strands is opposite to the direction of twist of strands
Wires are not twisted
Wires in two adjacent strands are twisted in opposite direction

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Machine Design
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Becomes minimum at an optimum speed and then increases with further increase in speed
Is minimum at zero speed and increases monotonically with increase in speed
Is maximum at zero speed and decreases monotonically with increase in speed
Remains constant at all speeds

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