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Previous Year Exam Questions of Theory Of Machine of bput - TM by Verified Writer

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b) The gears B and C are on one shaft while the gears D and E are on another shaft. The gear A drives gear B, gear C drives gear D and gear E drives gear F. If the gear A transmits 1.5 kW at 100 r.p.m. and the gear train has an efficiency of 80 per cent, find the torque on gear F. Four masses A, B, C and D revolve at equal radii and are equally spaced along a shaft. The mass B is 7 kg and the radii of C and D make angles of 90˚ and 240˚ respectively with the radius of B. Find the magnitude of the masses A, C and D and the angular position of A so that the system may be completely balanced. (5) Q6 The upper arms of a Porter governor has lengths 350 mm and are pivoted on the axis of rotation. The lower arms has lengths 300 mm and are attached to the sleeve at a distance of 40 mm from the axis. Each ball has a mass of 4 kg and mass on the sleeve is 45 kg. Determine the equilibrium speed for a radius of rotation of 200 mm and find also the effort and power of the governor for 1 percent speed change. (10) Q7 A cam drives a flat reciprocating follower in the following manner: During first 120˚rotation of the cam, follower moves outwards through a distance of 20 mm with simple harmonic motion. The follower dwells during next 30˚ of cam rotation. During next 120˚ of cam rotation, the follower moves inwards with simple harmonic motion. The follower dwells for the next 90˚ of cam rotation. The minimum radius of the cam is 25 mm. Draw the profile of the cam. (10) Q8 Write short answer on any TWO : Hunting Grubler’s criteria for determining degree of freedom for mechanisms ‘Interference’ related to gears Hammer Blow a) b) c) d) (5 x 2)

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