Theory of Machine
Which of the following is an inversion of a single slider crank chain?

Oscillating cylinder engine
All of these
Rotary internal combustion engine
Pendulum pump

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Theory of Machine
The contact ratio is given by

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

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