Theory of Machine
Which of the following mechanism is an approximate straight line motion mechanism?

Grasshopper mechanism
All of these
Watt's mechanism
Robert's mechanism

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Theory of Machine
The contact ratio is given by

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

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Theory of Machine
A body in motion will be subjected to Coriolis acceleration when that body is

In plane rotation with variable velocity
In plane motion which is a resultant of plane translation and rotation
In plane translation with variable velocity
Restrained to rotate while sliding over another body

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