Machine Design
In a multiple V-belt drive, if one of the belts break, then

Only the broken belt is replaced
The broken belt need not to be replaced
The entire set of belts is replaced
The broken belt and the belt on either side of it, is replaced

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Machine Design
A woodruff key is

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

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Machine Design
For unequal width of butt straps, the thicknesses of butt straps are

0.625 t for both the straps on the inside and outside
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for both the straps on the inside and outside

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