Machine Design
In a multiple V-belt drive, if one of the belts break, then

Only the broken belt is replaced
The broken belt and the belt on either side of it, is replaced
The entire set of belts is replaced
The broken belt need not to be replaced

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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

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

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

New and old belts will cause vibrations
Only one belt cannot be fitted with other used belts
Belts are available in sets
The new belt will carry more than its share and result in short life

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