Machine Design
The design calculations for members subject to fluctuating loads with the same factor of safety, yield the most conservative estimates when using

Gerber relation
Soderberg relation
Goodman relation
None of these

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Machine Design
The creep in the belt is due to

Effect of temperature on belt
Unequal extensions in the belt due to tight and slack side tensions
Material of belt
Stresses beyond elastic limit of belt material

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Machine Design
Form coefficient of spring is

Its capability of storing energy
Load required to produce unit deflection
Concerned with strength of wire of spring
Ratio of coil diameter to wire diameter

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Machine Design
A hollow saddle key is

A taper key which fits in a key way of the hub and is flat on the shaft
A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft
Provided in pairs at right angles and each key is to withstand torsion in one direction only
A taper key which fits half in the key way of hub and half in the key way of shaft

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