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2 Mark Questions 14 &7 Mark Questions 16AE213 – MECHANICS OF MACHINES IAE 2 Question Bank 2 Mark Questions 1. State D’ Almbert’ s principle 2. Define principal of superposition. 3. Classify gears based on the position of its shaft axis. 4. Explain Cycloidal tooth profile. 5. Write short note on undercutting with neat sketch. 6 Differentiate Piston effort and Crank effort 7 Differentiate static force and inertia force 8 List some methods to avoid interference. 9 Explain Law of Gearing. 10 Write short note on Length of path of contact. 14 &7 Mark Questions 11 Explain gear nomenclature with neat sketch. 12 The crank and connecting rod of a steam engine are 0.3m and 1.5m in length The crank rotates at constant speed of 190 rpm. Determine the crank angle which the maximum velocity occurs, Maximum velocity of the piston, The position of the crank for zero acceleration of the piston and the displacement of the piston. 13 The sun and planet gear of an epicyclic gear are shown in Fig . The annular gear D has 100 internal teeth, the sun gear A has 50 external teeth and planet gear B has 25 external teeth. The gear B meshes with gear D and gear A. The gear B is carried on the arm E, which rotates about the centre of annular gear D. If the gear D is fixed and arm rotates at 20 rpm, then find the speeds of gears A and B. 1 14.Two involute gears in mesh have 20° pressure angle. The gear ratio is 3 and the number of teeth on the pinion in 24. The teeth have a module of 6 mm. The pitch line velocity is 1.5 m/s and the addendum equal to one module. Determine the angle of action of the pinion (the angle turned by the pinion when one pair of teeth is in the mesh) and the maximum velocity of sliding 15 A pair of spur gear with 30 and 60 teeth are of involute profile and pressure angle is 200. Find the maximum addenda on the pinion and gear wheel to avoid interference if module is 6 mm. 16 Explain Length of path of contact with near sketch. 17 In a slider crank mechanism, the length of the crank and connecting rod are 150 mm and 600 mm respectively. The crank position is 60° from inner dead centre. The crank shaft speed is 450rpm (clockwise). Using analytical method, determine: 1.Velocity and acceleration of the slider 2.Angular velocity and angular acceleration of the connecting rod. 18 In a vertical double-acting steam engine, the connecting rod is 4.5 times the crank. The weight of the reciprocating parts is 120 kg and the stroke of the piston is 440 mm. The engine runs at 250 rpm. If the net load on the piston due to steam pressure is 25 kN when the crank has turned through an angle of 120° from the top dead centre, determine the, i) Thrust in the connecting rod ii) Pressure on slide bars iii) Tangential force on the crank pin iv) Thrust on the bearings Turning moment on the crankshaft 19 In a compound Epi-cyclic gear train as shown in the figure-I, has gears A and an annular gears D & E free to rotate on the axis P. B and C is a compound gear rotate about axis Q. Gear A rotates at 90 rpm CCW and gear D rotates at 450 rpm CW. Find the speed and direction of rotation of arm F and gear E. Gears A,B and C are having 18, 45 and 21 teeth respectively. All gears having same module and pitch. 20 Two gear wheels mesh externally and give a velocity ratio of 3. The teeth are of involute from of module 6. The standard addendum of one module being used. If the pressure angle is 20 and pinion rotates at 90 rpm. Find: (i) Number of teeth on each wheel so that 2 interference is just avoided. (ii) The length of path of contact. (iii) Contact ratio. (iv) Maximum velocity of sliding between the meshing teeth. 21 Determine the minimum number of teeth required on a pinion, in order to avoid interference which is to gear with (1) a wheel to give a gear ratio of 4 to 1 and (2) an equal wheel. The pressure angle is 200 and a standard addendum of 1 module for the wheel may be assumed. 22 Differentiate Cycloidal and Involute gear profile. 3 .
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