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H1124 Pages: 3

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
EIGHTH SEMESTER B.TECH DEGREE EXAMINATION, MAY 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.

A simple band brake as shown in figure below is to be designed to absorb a power
of 32 kW 81 a rated speed of 850 rpm. Assume pt = 0.25. Determine, (i) The effort
required to stop clockwise rotation of the brake drum, (ii) The effort required to
stop counter clockwise rotation of the brake drum,(iii) The dimensions of the
rectangular cross-section of the brake lever assuming its depth to be twice the
width, and (iv) the dimensions of the cross-section of the band assuming its width

to be ten times the thickness.

What are the advantages and disadvantages of band brake?

A single row deep groove ball bearing has a dynamic load capacity of 40210 N
and operates on the work cycle consists of radial load of 2000 N at 1000 rpm for
25 % of the time, radial load of 5000 N at 1500 rpm for 50 % of time, and radial
load of 3000 N at 700 rpm for the remaining 25 % of time. Calculate the
expected life of the bearing in hours.

Define static and dynamic load carrying capacity of ball bearing.

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Duration: 3 Hours

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