In Fig.15.19, pinion A having 15 teeth is fixed to motor shaft. z = 20, z = 15, where B and C are a compound gear wheel. Wheel E is keyed to the machine shaft. Arm F rotates about the same shaft on which A is fixed and carries the compound wheel B, C. If the motor runs at 1200 rpm counter-clock- wise, find (a) the speed of the machine shaft, (b) the torque exerted on the machine shaft if the motor develops a troque of 1200 Nm with an efficiency of 95%, and (c) ratio of the reduction gear. F B Fig.15.19 Mechanism with a compound gear wheel