Q3:- The Fig. below shows an epicyclic gear train in which the gear D is held stationary by shaft A and arm B is rotating at 200 rpm ccw. The gears E and F are carried by the arm. The gear G is rigidly attached to shaft C. Find the magnitude and direction of the speed of shaft C. If the gear train is transmitted 7.5 kW what is the torque required to hold shaft A stationary? Given that Z;-40, Z=30 and Ze=20. B C D

An engine turns at 250 revolutions per minute and its stroke is 450 mm. Find the average pistol speed in meters per minute, and the speed of the centre of’ the crank pin in meters per minute.

Question 1 An epicyclic gear train, as shown in Fig. 1, has a sun wheel S of 30 teeth and two planet wheels P-P of 50 teeth. The planet wheels mesh with the internal teeth of a fixed annulus A. The driving shaft carrying the sun-wheel S, transmits 4 kW at 300 r.p.m. The driven shaft is connected to an arm which carries the planet wheels. 1.1 Tabulate a table of motion for the given epicyclic gear train. 1.2 Determine the number of teeth in gear A, assume module is the same on all the gears. 1.3 Determine the speed of the arm or the driven shaft. 1.4 Determine the torque of the sun. 1.5 Determine the torque of the arm if the overall efficiency is 95 %. Arm S A a. 1 Figure 1: An epicyclic gear train

5. For the engine-transmission-propeller problem shown below, The engine generates a torque of 219lb-ft, and it is bolted to a frame at locations A and B. The transmission reverses the rotation direction. The transmission ratio is 1.5 (i.e. the propeller speed is -1/1.5 the engine speed, the minus sign indicates the change in direction). d. Sketch the free body diagram. Be sure to show the torques at the input and outputs to the different components. Note the change in the rotation direction between the engine and shaft. e. Solve for the reaction forces at the bolt supports of the engine, if the distance between them is 1 ft. Propeller Engine Reduction ratio 1.5 Engine is attached B