forward stroke

return stroke

both the forward and return strokes

neither the forward nor the return stroke

machining horizontal surface

machining vertical surface

machining angular surface

all of these

L-type slots

T-type slots

I-type slots

nay one of these

stroke length

motor power

mass of machine

rate size

increasing the centre distance of bull gear and crank pin

decreasing the centre distance of bull gear and crank pin

increasing the length of the arm

decreasing the length of the slot in the slotted lever