Reg No.:

06000ME301122001 Pages: 2

Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Fifth Semester B.Tech Degree Regular and Supplementary Examination December 2020

Max. Marks: 100

7 2)

Course Code: ME301
Course Name: MECHANICS OF MACHINERY

PARTA
Answer any three full questions, each carries 10 marks.

Explain with neat sketch, an application each of the four inversions of slider
crank mechanism.
In a four-link mechanism, the crank AB rotates at 36 rad/s. the lengths of the
links are AB = 200mm, BC = 400mm, CD = 450mm and AD = 600mm. AD is
the fixed link. At the instant when AB is at right angles to AD, determine the
velocity of the midpoint of link BC.
In a single slider crank mechanism, the lengths of the crank and connecting rod
are 300 mm and 400 mm respectively. The slider is positioned in line to the
crank axis at a distance of 500 mm. At a particular instant, the crank is inclined
at 110° with the line of motion of the slider. It is rotating with an angular
velocity of 70 rad/s and angular acceleration 900 rad/s* in the clockwise
direction. Compute the acceleration of the slider and angular acceleration of the
connecting rod.
a) Sketch the displacement, velocity, acceleration and jerk diagrams of a cam

follower which moves with cycloidal motion.
b) List the different types of cams based on their shape? Sketch any one type of

cam.

PART B
Answer any three full questions, each carries 10 marks.

Design a cam profile as per the data given;
a) The least radius of the cam is 30 mm.
b) The cam is rotating a speed of 1600 rpm counter clockwise.
c) The axis of the knife edge follower is offset by 10 mm to the left.
d) The follower is provided a maximum lift of 40 mm during 160° of the cam
rotation subjected to constant acceleration and deceleration.
e) Dwell for the 40° rotation of the cam.
f) Drop of the follower for the next 100° rotation of the cam with SHM and
followed by dwell.
a) Explain tangent cam with neat sketch.
b) Obtain the condition for minimum acceleration for a tangent cam with roller

follower, when the roller is on the flank.
State and prove the law of gearing.

Duration: 3 Hours

Marks
10

10

10

10