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11192017 Pages: 2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
EIGHTH SEMESTER B.TECH DEGREE EXAMINATION(S), OCTOBER 2019

Course Code: ME402
Course Name: Design of Machine Elements-II

Use of design data book is permitted
Missing data may be suitably assumed
PARTA
Answer any two full questions, each carries 15 marks.
Design a dry single plate clutch having both sides effective to transmit 19 kW at
1500 rpm. The ratio of mean radius to radial width is 4.5. The axial thrust is
provided by 6 springs. Take, coefficient of friction = 0.2 and allowable pressure =
0.245 M Pa. Assume, spring index, C = 6, shear stress = 420 MPa and G = 84
GPa. Find (i) mean radius and width of friction surfaces, (11) dimensions of clutch
plate and (iii) dimensions of springs.
Design a full hydrodynamic journal bearing operating at 1200 rpm and carrying a
load of 6 k N. The journal material is hardened steel and bearing is of babbit
material. The bearing is lubricated with SAE 30 oil and the operating temperature
of oil is 69 °C. Assume ambient temperature as 30°.
Explain the significance of bearing characteristic number in the design of sliding
contact bearing.
Explain the mechanism of fluid film lubrication.
What is Sommerfeld number? Explain its significance in the design of
hydrodynamic bearing.
PART ‏تا‎
‎Answer any two full questions, each carries 15 marks.
A compressor receives power through a pair of spur gears. The compressor shaft
runs at 350 rpm while the motor shaft runs at 1450 rpm, delivering 40 kW power.
The power transmission is with moderate shock and the drive is to operate 10
hours per day. Pinion is made of steel C-40 heat treated and gear is made of cast
steel. Design the spur gear set.
A pair of straight tooth bevel gears at right angles is to transmit 5 kW at 1200 rpm
of the pinion. The diameter of the pinion is 80 mm and the speed reduction is

3.5:1. The tooth form is 20° full depth involute. Both the pinion and gear are

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Duration: 3 Hours

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