Machine Design
A woodruff key is

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

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

Belts are available in sets
Only one belt cannot be fitted with other used belts
New and old belts will cause vibrations
The new belt will carry more than its share and result in short life

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Machine Design
The elasticity is the property of a material which enables it to

Resists fracture due to high impact loads
Retain deformation produced under load permanently
Draw into wires by the application of a tensile force
Regains its original shape after deformation when the external forces are removed

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