me 010 504 kinematics of machinery
TRANSCRIPT
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7/28/2019 Me 010 504 Kinematics of Machinery
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B.TECH DEGREE EXAMINATION
MODEL QUESTION PAPER
ME 010 504: Kinematics of Machinery(Drawing sheet may be provided)
Time: 3hrsMax. Marks: 100
PART A (3x5)
(Answer All Questions)
1. What is meant by a Grashof mechanism?
2. What is meant by instantaneous center of rotation? How do we know
the number of instantaneous centers in a mechanism?
3. What is the significance of Chebychev spacing in linkage synthesis?
4. How do you classify cam followers according to shape?
5. Define pressure angle of a gear.
PART B (5x5)
(Answer All Questions)
6. What are straight line mechanisms? Describe one type of exact
straight line motion mechanism with the help of a sketch.
7. State and prove Arohnold Kennedys theorem.8. Explain the overlay method of graphical synthesis.
9. Deduce the expressions for the velocity and acceleration of a cam
follower when it moves with simple harmonic motion.
10. State and derive the law of gearing.
PART C (12x5)
Module I
11. Explain the different inversions of the slider crank mechanism.
Or
12. A crank rocker linkage has a 100mm frame, a 25mm crank, a
90mm coupler, and a 75mm rocker. Draw the linkage and find the
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maximum and minimum values of transmission angle .Locate the
both toggle positions and record the swing angle of the rocker.
Module II
13. Find the velocities of points B, C, and D of the double slidermechanism shown in figure if crank rotates at 42 rad/s ccw. Also
find the acceleration of the point D.
Or
14. What is meant by Coriolis component of acceleration? Derive the
expression for the
same.
Module III
15. Synthesize a function generator to solve the equation y = 1/x, 1< x < 2 using three
precision points.
Or
16. a) Which are the different steps in kinematic synthesis? (6)
b) Draw a crank rocker to give 45 rocker rotations with equal time
forward and backward.
(6)
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Module IV
17. Draw the profile of a cam which raises a valve with SHM through 3cm in 1/3 of
revolution, keep it fully raised through 1/12 revolution and it is closed in next 1/3
revolution with SHM. The valve remains closed during the rest of revolution. The
diameter of the roller is 1cm and minimum radius of the cam is to be 2cm.The axis of
the valve rod is offset by 1cm from the axis of the cam shaft.
Or
18. A cam with a minimum radius of 25mm is to be designed for a knife edge follower
with the following data:
i) To raise the follower through 35mm during 60 rotation of the cam
ii) Dwell for next 40 of the cam rotation
iii) Descending of the follower during the next 90 of the cam rotation
iv) Dwell for the rest of the cam rotation
Draw the profile of the cam if the ascending and descending of the cam is with simple
harmonic motion and the line of stroke of the follower is offset 10mm from the axis
of the shaft
Module V
19. A 20 involute pinion with 20 teeth drives a gear having 60 teeth .Module is 8mm and
addendum of each gear is 10mm.
i) Show whether interference occurs or not
ii) Find the length of path of approach and arc of approach if pinion is the driver.
Or
20. In an epicyclic gear train an annular wheel A having 54 teeth
meshes with a planet wheel B which gears with a sun wheel C, the
wheels A and C being coaxial. The wheel B is carried on a pin fixed
on one end of arm P which rotates about the axis of the wheels A
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and C.If the wheel A makes 20 r.p.m in a clockwise sense and the
arm rotates at 100 r.p.m in the anticlockwise direction and the
wheel C has 24 teeth, determine r.p.m and sense of rotation of C