Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Permit each leaf to act as an overhanging beam
Make M/I constant throughout the length of the leaf
Obtain variable moment of inertia (I) in each leaf
Have variable bending moment (M) in each leaf

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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
When a belt drive is transmitting maximum power,

Driving tension on tight side is twice the centrifugal tension
Effective tension is equal to centrifugal tension
Effective tension is half of centrifugal tension
Driving tension on slack side is equal to centrifugal tension

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