Reg No.: Name:

A7017

Total Pages: 2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017

Course Code: ME301
Course Name: MECHANICS OF MACHINERY (ME, MP, PE)

Max. Marks: 100 Duration: 3 Hours

PART A
Answer any three full questions, each carries 1Omarks. Marks
a) Distinguish between lower and higher kinematic pairs with ONE example each. (2)
b) Sketch and explain slider-crank chain; Show with sketch any two inversion (8)
mechanisms obtained from it.

a) Explain any ONE exact straight line mechanism with suitable diagram. (5)
b) Sketch and explain Geneva mechanism; List any ONE use of this mechanism.
(5)

A slider crank mechanism is having following dimensions crank 480mm, (10)
connecting rod 1600mm. If crank is rotating at 20rad/s counter clockwise (CCW) and is
at 60 from the IDC measured counter clock wise, calculate following i) Velocity of slider
ii) Acceleration of slider
iii) Angular acceleration of connecting rod
a) What is coriolis component of acceleration; How its magnitude and directions are
(4) calculated?
b) Perform displacement, velocity and acceleration analysis of cam-follower (6)

subjected to uniform acceleration/deceleration motion

PART 8
Answer any three full questions, each carries 10marks.
a) Obtain the profile of a disc cam operating roller follower having the following (8)
motions; Cam lifts the follower for 120° with SHM followed by 30° dwell. During next
150° follower is lowered with uniform acceleration and deceleration and then dwell.
Assume minimum radius of cam ೩5 25mm, lift as 30mm and roller diameter 15mm

b) Draw the profile of tangent cam with roller follower; why such cams are (2)
preferred?
a) For the case of gears, What is meant by i) Pressure angle, ii) Circular pitch, 1)
(3) Module.

b) A pinion having 30 teeth drives a gear having 80 teeth. The profile of gears is (7)
involute with 20° pressure angle, 12 module and 10mm addendum. Find the length
of the path of contact, arc of contact and the contact ratio.

a) What is meant by backlash in gears; How it can be reduced? (3)

b) With reference to helical gears with the help of a sketch; define (7)
i) Helix angle 1) Circular pitch iii) Normal circular pitch.

a) Distinguish between internal and external gears, rack and pinion with sketch. (4)

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