Machine Design
An open belt drive is used when

Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

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Machine Design
According to Indian standard specifications, 100 H6/g5 means that

Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7
Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
Tolerance grade for the shaft is 6 and for the hole is 5
Tolerance grade for the hole is 6 and for the shaft is 5

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

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

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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

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

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