The coefficient of fluctuation of speed is a critical factor used in the design of which component?

If α denotes the lead angle and θ denotes the angle of friction, then the efficiency of a screw jack is given by:

The most ideal follower motion programme for a high-speed cam-follower engine system to avoid shocks is:

In a four-bar linkage, if the lengths of the links are 100 mm (fixed), 150 mm, 200 mm, and 250 mm, what type of mechanism is it according to Grashof's law if the shortest link is fixed?