a) An epicyclic gear have three wheels A, B and C. Wheel A has 72 internal teeth, wheel C has 32 external teeth. The wheel B gears with both A and C is carried on an arm which moves about the center of A at 18 r. p. m. If the wheel A is fixed, Evaluate the speed of wheels B and C. 15
b) With the help of diagrams and examples discuss different types of geartrains.