Machine Design
A woodruff key is

Capable of tilting in a recess milled out in the shaft
Fitted in pairs at right angles
All of these
A tapered key with head at one end

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

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
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

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