Theory of Machine
The contact ratio is given by

(Length of the arc of approach)/cosφ
(Length of the path of approach)/(Circular pitch)
(Length of the arc of contact)/(Circular pitch)
(Length of path of recess)/(Circular pitch)

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Theory of Machine
The maximum fluctuation of speed is the

Difference of the maximum and minimum speeds
Difference of minimum fluctuation of speed and the mean speed
Variations of speed above and below the mean resisting torque line
Sum of maximum and minimum speeds

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Theory of Machine
Which of the following statement is correct as regard to the difference between a machine and a structure?

All of these
The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another
A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work
The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only

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