ANNA UNIVERSITY QUESTION PAPER NOVEMBER / DECEMBER 2018

1. ~
Question Paper Code : 2385.5
B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2018.
Sixth Semester
Mechanical E~gineering
ME 2352·- DESIGN OF TRANSMISSION SYSTEMS
(Common to Mechanical and Automation Engineering)
(Regulations 2008)
(Also common to PTME 2352 -. Design ofTransmission System for
B.E. (Part-Time) Fifth Semester- Mechanical Engineering-
Regulations 200~)
Time·: Three hours Maximum : 100 marks
1.
2.
3.
4.
5.
6.
7.
8.
9.
Use of Approved Design Data Books permitted.
Any •missing data may be suitably assumed.
Answer ALL questions.
PART A--=- (10 x 2 = 20 marks)
What is the condition to transmit maximum power in a flat belt drive?
How the wire ropes are designated?
Backlash of Spur gear depends on which of two factors?.
What are the common profiles used for gear tooth?
State the.ttdvantages of herring bone gear.
What is a zerol bevel gears?
Draw the ray diagram for a six speed gear box. ·
In which gear-drive, self-locking is available?
What is the axia~ force required at the engagement and disengagement of cone
clutch?
10. What is a self-locking brake?
l
::.'
BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY 1

2. PART B--:- (5 x 16:;::: 80 markg)
11. (a) Design a V-belt drive and calculate the actual belt tensions and average
stress for the following data. Power to betransmitted== 7.5 kW, Speed of
driving wheel :::: 1000 rpm, Speed of driven wheel =300 rpm, Diameter of
driven pulley = 500 mm, Diameter of driver pulley = 150 mm and Center
distance == 925 mm.
Or
(b) A 7.5 kW electric motor running at 1400 rpm is used to drive the input
shaft of the gearbox of a machine. nesign a suitable roller chain to
connect the motor shaft to the gear box shaft to give an exac:t speed ratio
of 10: 1. The center to center distance of the shaft is to be approximately
600mm.
12. (a) Design a straight spurgear drive. Transmitted power 8 kW. Pinion speed ·
764 rpm. Speed ratio is 2. The gears ~re to be made of C45 steel. Life is to
be 10,000 hours.
Or
(b) Design a pair of helical gears to transmit 10 kW at 1000 rpm of the
Winion. Reduction ratio of 5 is required. Give details of the drive .in a
tabular form.
13. (a) Design a bevel gear drive to transmit 3.5 kW. Speed ratio = 4. Driving
shaft speed 200 rpm. Pinion is of steel and wheel of Cl. Assume a life of
25000 hrs.
Or
(b) A hardened steel worm rotates at 1400 rpm and transmits 12 kW to a
phosphor bron~ gear. The speed of the worm wheel sho.uld be 60 rpm.
Design the worm gear drive ifan efficiency of at least 82% is desired.. .
14. . (a) A nine speed gear box, used as head stock gear box of a turret lathe, is to
provide a speed range of 180 rpm to 1800 rpm using standard step ratio,
draw the speed diagram.and kinematic arrangement showing number of
teeth in all gear.
Or
(b) A. gear box is to give 18 speeds 'for a spindle of a milling machine.
Maximum and minimum speeds of the spindle are to be around 650 and
35 rpm respectively. Find the speed ratios which will give the desired
speeds and draw the structural diagram and kinematic arrangement of
the drive.
2 23855
BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY 2

3. 15. (a) A single plate clutch transmits 25 kW at 900 rpm. The maximum
pressure intensity between the plates is 85 kPa. The ratio·ofrad.ii is .1.25.
Both the sides of the plate ate effective and the coefficient of fricti~n is
0.25. D~termine (i) the inner diameter of th'e plate, and (ii) the axial force
to engage the clutch. Assume theory of uniform wear. (16). .
Or
(b) Describe with the help of a neat sketch the principles of an internal
expanding shoe. Also deduce the expression for. the braking torque. (16)
3 23855
BIBIN.C / ASSOCIATE PROFESSOR / MECHANICAL ENGINEERING / RMK COLLEGE OF ENGINEERING AND TECHNOLOGY 3