Figure below shows the mechanism of a variable-stroke pump. The drive is taken from the crank OA to the pin B on the connecting rod CBD. The end C of the connecting rod carries a slider which is free to move along the curve link EFC. The stroke of the pump may be varied y rotating the link EFG about the fixed pivot G, although during operation the position of EFG is fixed. 1. If the crank OA rotates clockwise at 100 rev/min, find the velocity of the piston D for the position shown in the figure. (Instantaneous centre method) [0.351 m/s] 2. Find the acceleration of the piston D OA = 75 mm Radius of curvature of link EFG = 400 mm Length of connecting rod DC = 400 mm DB=300 mm In the given position, D and A are on the same horizontal line F B 400 mm 301 E G 350 mm 90° 350 mm