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

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Machine Design
The creep in the belt is due to

Stresses beyond elastic limit of belt material
Unequal extensions in the belt due to tight and slack side tensions
Effect of temperature on belt
Material of belt

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