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

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Machine Design
A woodruff key is

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

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

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

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