Machine Design
In a belt drive, if the pulley diameter is doubled keeping the tension and belt width constant, then it will be necessary to

Increase the key depth
Decrease the key length
Increase the key length
Increase the key width

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Machine Design
Spring stiffness is

Its ability to absorb shocks
Load required to produce unit deflection
Its capability of storing energy
Ratio of coil diameter to wire diameter

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

Tolerance grade for the hole is 6 and for the shaft is 5
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

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