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

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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 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
Equating shearing resistance to the crushing resistance of the rivets

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Machine Design
Slenderness ratio is the ratio of

Maximum size of column to minimum size of column
Effective length of column to least radius of gyration of the column
Width of column to depth of column
Effective length of column to width of column

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Machine Design
The flank of the tooth is the

Surface of the tooth below the pitch surface
Width of the tooth measured along the pitch circle
Surface of the tooth above the pitch surface
Surface of the top of the tooth

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