Anna University Chennai 2007-3rd Sem B.E Mechanical Engineering ./B.Tech , ME 232 — KINEMATICS OF MACHINES - Question Paper

B.E./B.Tech. DEGREE EXAMINATION,
Third Semester
Mechanical Engineering
ME 232 — KINEMATICS OF MACHINES
(Common to Mechatronics Engineering)
Time : 3 hours Maximum : 100 marks
Instructions : 1. ans ALL the ques..
2. Write brief procedure for graphical constructions.
3. Sketches should be drawn neatly.
4. Answers without units and with wrong units will carry
less marks.
5. Symbols used should be discussed atleast once in every
solution.
6. Answers without writing the relevant equations and
equations without substituting the data will carry ZERO
marks.
PART A — (10 ? two = 20 marks)
1. How many inversions are possible from a four–bar kinematic chain? Name them based on their input–output motions.
2. elaborate the 3 conditions to find a four–bar crank–rocker mechanism?
3. Sketch the Geneva wheel indexing mechanism and state its application.
4. Distinguish normal component of acceleration and tangential component of acceleration.
5. State the advantages of cam mechanisms over linkage mechanisms.
6. Briefly write about undercutting in cam mechanisms.
7. State the relationship ranging from circular pitch and the module.
8. Briefly write about reverted gear train with suitable sketch.
9. State the laws of dry friction.
10. The coefficient of friction ranging from the belt and the pulley in a belt drive is 0.3. The angle of lap is 165?. If the tension on the tight side is 3000 N, determine the tension on the slack side.
PART B — (5 ? 16 = 80 marks)
11. (i) describe transmission angle. Sketch a drag–link mechanism in maximum
transmission angle and minimum transmission angle positions. (4)
(ii) describe kinematic inversion. define in detail with neat sketches an elliptic trammel. (6)
(iii) Design a four–bar crank rocker quick return mechanism for the subsequent data : Rocker swing angle = 90?, Time ratio = 1.25 and output link length = 60 mm. (6)
12. (a) (i) How will you determine the magnitude and direction of the Coriolis
Acceleration vector? (2)
(ii) In a four–bar mechanism ABCD, the link lengths in mm are as
follows : Input AB = 25, coupler BC = 85, output CD = 50 and frame AD = 60. The angle ranging from the frame and the input is 100?
measured anti–clockwise. The velocity of point B is 1.25 m/sec in
the clockwise direction. Sketch the mechanism and determine the
velocity and acceleration of the mid–point of the link BC. Also, obtain
the angular velocity and angular accelerations of the links BC
and CD. (14)
Or
(b) (i) State and prove the ARONHOLD–KENNEDY theorem involving

Earning:   Approval pending.