Machine Design
An open coiled helical compression spring 'A' of mean diameter 50 mm is subjected to an axial load ‘W’. Another spring 'B' of mean diameter 25 mm is similar to spring 'A' in all respects. The deflection of spring 'B' will be __________ as compared to spring 'A'.

One-eighth
Double
One-fourth
One-half

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

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Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Open and crossed belt drives transmit same power
Open belt drive transmits more power than crossed belt drive
Crossed belt drive transmits more power than open belt drive
Power transmission does not depend upon open and crossed types of constructions

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