Reg No.:

N ∶
0800CE 7201122002.
APJ ABDUL KALAM TECHNOL ICAL UNIVERSITY

Third Semester B.Tech Degree Examination December 2020 (2019 Scheme)

Course Code: CET201
Course Name: MECHANICS OF SOLIDS

Max. Marks: 100 Duration: 3 Hours
PART A
Answer all questions. Each question carries 3 marks Marks
1 With help of stress-strain diagram, briefly explain Hooke’s Law. (3)
2 Define Factor of Safety. Calculate the working load on a cantilever beam if it (3)

carries an ultimate load of 100 kN with a factor of safety of 2.

3 Use neat sketches to illustrate the concept of shear stress and shear strain. (3)

4 Define Poisson’s ratio. Also state the relationship between the elastic constants. (3)

5 Define Bending moment and Shear force. (3)

6 What do you mean by point of contraflexure? State its significance. (3)

7 Write the equation of simple bending and state each term involved in it. (3)

8 Using the case of a simply supported beam with constant width, illustrate the (3)

concept of beams of uniform strength.

9 Define the terms: Principal stress and principal planes. (3)

10 What is slenderness ratio? State its significance. (3)
PART ‏تا‎

Answer any one full question from each module. Each question carries 14 marks

Module 1

11 The steel bar shown fig:1 has the following dimensions: (14)

Total length — 2400mm; 18 mm diameter for half the length and 12 mm

diameter for the remaining half.

(i) If the bar is subjected to a tensile force of 22.5kKN, Calculate the normal
stress and normal strain in the segment AB and BC respectively.

(ii) | Also find the total extension of the bar when it is subjected to a tensile
force of 22.5KN.

(iii) What would be the extension of a steel bar of uniform diameter having
the same length and same volume when subjected to the same tensile

force?

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