B B7075
Total Pages: 2
Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017
Course Code: ME201
Course Name: MECHANICS OF SOLIDS (ME,MP,MA,MT,AU,PE,SF)
Max. Marks: 100 Duration: 3 Hours
PARTA

Answer any three full questions, each carries 10marks. Marks | ೩) Explain

Hooke’s law for linearly elastic isotropic material. (3)

b) A steel tie rod 40 mm in diameter and 2 m long is subjected to a pull of 80KN. To (7) what length

the bar should be bored centrally so that the total extension will increase by 20% for the
same pull, the bore being 20 mm in diameter. Take E = 2 x 10° N/mm’.
a) Define the terms resilience and proof resilience. (3) b) A copper strip 20 x
2.5 mm? in section is held between two strips of steel each 20 > (7)
2.5 mm‘? in section. Find the stresses in steel and copper due to temperature rise of
6°C. Take as = 1.2 x 107 / °C, ae = 1.85 x 10° / °C, Es= 2 x 10° N/mm? and ‏ح5‎ 2
x 10° N/mm’.
a) Define Poisson’s ratio. (2) b) A bar of circular cross section 20 mm diameter is
subjected to an axial compressive (8)
load of 100 KN. The increase in diameter is found to be 0.0082 mm. Calculate the
values of Poisson’s ratio and modulus of elasticity. Take modulus of rigidity as 8 x
10* N/mm’.
A solid aluminium shaft 1 m long and 50 mm diameter is to be replaced by a (10) tubular
steel shaft of the same length and the same outside diameter such that each of the two shafts
could have the same angle of twist per unit torsional moment over the total length. What
must the inner diameter of the tubular steel shaft be?
Modulus of rigidity of the steel is three times that of aluminium.
PART 8

Answer any three full questions, each carries 10marks.
A simply supported beam ABC with supports at A and B, 5m apart with an (10) overhang
BC 2m long carries a uniformly distributed load of 20 KN/m over the whole length as shown
in Fig.1. Draw S.F and B.M diagrams and locate the point of contraflexure.

10 kN

Fig. |

6 9) What do you understand by the term ‘point of inflection'? (2)
b) A simply supported beam of length 10 m carries a uniformly distributed load of 10 (8)

kN/m over a span length of 5 m from the left support. A point load of 15 KN and a
moment of 10 kKN-m are acting on the beam at a distance of 6.5 m and 8 m
respectively from the left support. Draw the SF and BM diagrams. Find out the
maximum bending moment and its location.

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