Machine Design
When two helical springs of equal lengths are arranged to form a cluster spring, then

Load taken by each spring will be half the total load
Only A is correct
Both A and B is correct
Shear stress in each spring will be equal

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

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Machine Design
The effective stress in wire ropes during normal working is equal to the stress due to

Bending plus stress due to acceleration/retardation
Axial load plus stress due to bending
Axial load plus stress due to acceleration/retardation
Acceleration/retardation of masses plus stress due to bending

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Machine Design
Spring index is

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

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