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lOME/AU44
USN
Fourth Semester B.B. Degree ExaminatiofrfDec
.20151
Jan.20l6
Kinematics of Machines
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Max. Marks:1 Note : a/'nswe r FIVE fufi g ue s ti o n s, s e I e ct ing at least TIInO questionsfrom each part.
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Define the following, giving one example for each: ii) Mechanism iii) Structure i) Kinematic chain (10 Marks) iv) Inversions v) Degree of freedom Explain with a neat sketch, the double slider crank chain mechanism and its inversions (any
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(06 Marks) Sketch Peaucellier's mechanisrn, and prove that it can trace a straight line. With a neat sketch, explain the condition for correct sfeering for Ackermann's mechanism.
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For the mechanism shown in Fig.Q3(a), the crank OA rotates at 20 rpm in CCW and gives motion to the blocks 'B' and 'D'. The dimensions of various links are OA : 300 mm, AB : 1200 mm, BC:450 mm and CD :450 mm. For the given configuration, determine: velocity of the sliding block B u"d Augular velocity of ,jl),. iii) I inear acceleration of 'D' qy" ;
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... ,.._ Fie.Q3(a) of acceleratjon? Explain with an example and neat
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' * th Explain the analysis of velocity and acceleration of a piston in a single slider crank ,_(
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mechanism using Klein's construction. Locate allthe instantaneous centres of the mechanism shown in , .A uA
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Fig.Q4(c).
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cB:240 mm A8:360 mm BD:540
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For More Question Papers Visit - www.pediawikiblog.com 10ME44 PART - B For an offset slider crank mechanism shown in Fig.Q5, write. the loop close'' l+ 1-.;
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Derive an expression to determine length of arc of c6ntact for a pair of mating gears.
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Explain with neat sketch, the classification of gear trains. (06 Marks) The Fig.Q7(b) shows an epicyclic gear train where the arm 'A', the driver and annular gear 'D' is the follower. The wheel 'D' has 112 teeth and B has 48 teeth, 'B' runs freely on pin 'P' and 'D' is separately driven. The arm'A'runs at 100 rpm and wheel 'D' at 50 rpm in same direction. Find the speed of wheel 'B' and 'C'.
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(10 Marks)
pair of gears having 40 and 30 teeth iespectively are of 25 degree involute form.
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determine the expression for, i) Connecting rod angle and outputdisplacement ii) Angular velocity of connecting rod iii) Angular acceleration of connecting rod iv) Angular acceleration of piston. (Use complex number method).
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The following data relate to a cam profile in which, the roller follo#dr moves'rifitff'" acceleration and retardation motion during ascent and descent. Minimum radiusJ of cam: 25 mm. Roller radius : 8 mm. Lift: 32 mm, offset of follower axis 12 mm towards right, angle of ascent 60o, angle of descent 90o, angle of dwell between ascent and (20 Marks) descent : 45o, speed of cam: 20 rpm clockwise. Draw the profile of cam.
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