Fourth Semester B.E. Degree Examination, Dec.2014/Jan.2015Kinematics of Machines .\.)x,

:100J e: 3 hrs./' J - Note: Answer any FIVE full questions, selecting •..,pr ~.

00 atleast TWO questions from each part. " J

~~. PART-A ,~a. What ( i ou mean by rigid link? Explain types of links with examR eb. Explain ' Howing inversions with neat sketch: (") ; V

i) Doub e~ocker mechanism. .-Vii) Crank an otted lever type quick return motion mec pis (10 Marks)

c. Defme degrees of edom and state the relation for the ~ e for planar mechanisms havingonly turning and sli ~ pairs. ~. (04 Marks)

t~ Wa. Sketch PeauseHies mecha is I and prove that it race a straight line. (10 Marks)b. Explain pawl and ratchet ~~,~~echanism w at sketch. (05 Marks)c. With neat sketch, explain the co' '~~ for ,0 ect steering for Ackermann-mechanism.''l); (05 Marks)

a. What is Coriolis component of aCGele f n. Derive the expression for the same. (08 Marks)b. A quick return motion mechanis shown in Fig.Q.3(b). Link 2 rotates with constant speed

of 21 rad/sec. in CW dire Qn. Determin, angular acceleration of link 3. TakeOA = l50mm, OC = 350 , B = 250mm. (5' (12 Marks)

(05 Marks)Find the velocity of the slider~ 360mm, BC = 250mm and, y _ (15 Marks)

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5 a.

b.

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b.

PART-BUsing complex algebra derive the expressions for velocity and acceleration of the piston foran in-line slider crank mechanism. (10 Marks)

For an in-line slider crank mechanism of crank length of 50mm, crank angle of 30° andconnecting rod of length of 150mm. Determine the velocity and acceleration of the sliderusing complex algebra-method. Take the constant speed of crank as 2100rpm idirection. (1

What is interference? Derive the relation for the minimum number of teet (')c:1•i volute profile of teeth to avoid interference.T-l},e:)WOspur gears of 19 and 47 teeth respectively are in mesh. The mo e IS6.5rnrn andpress • angle is 20°. Determine the number of pairs in contact and ngle turned by thelarger . '€ Iwhen one pair of teeth in contact. (10 Marks)

E I· ~ • "h k ha. xp am rev type gear tram WIt s etc . (05 Marks)b. An epicyclic g ~ train is shown in Fig.Q.7(b) Annular gea A ISkeyed to the driving shaft

and has 30 teeth. om ound wheel C and D of 20 and 2 et respectively are free to rotateon the pin fixed to t· rm P which is rigidly conne to the driven shaft. Internal gear Bwhich has 32 teeth is 1 e.d' f the driving shaft runs OOrpm in CWo Find the speed of thedriven shaft. What is the ction of rotatio .,the driven shaft with reference to thedriving shaft? ~ (15 Marks)

,tie-M'() ~y

0°.~~~ Fig.Q.7(b) ~

~ ~Dra fie earn profile for the following data for a roller follower: 0d>' s t = 10rnrn towards right of earn ' t:B.: ller radius = 10rnrn

inimum radius of the earn = 20rnrnMaximum displacement of the follower = 24rnrn •Outstroke angle = 90° of earn rotation with UARM, acce

being half of the retardation= 30° of earn rotation= 90° of cam rotation with modified uniform

velocityAfter the return stroke earn dwells for the remaining period. Determine the maXImumvelocity and acceleration during outstroke only. Speed of earn is 600rpm in CWo (20 Marks)

Dwell at the elevated positionReturn stroke

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