Annamalai University 2014 december question paper

B.Sc. DEGREE EXAMINATION December 2014

(CONSTRUCTION MANAGEMENT)

(THIRD SEMESTER)

320: STRENGTH OF MATERIALS-I

Time: Three hours Maximum: 75 marks

Answer ONE FULL question from each UNIT (5 × 15 = 75)

UNIT-I

1. a) Define young’s modulus. (3)

b) A steel rod 25mm in diameter and 2m long is subjected to an axial pull

of 50kN. Find (i) the intensity of stress (ii) Elongation. Take

E=2×105N/mm2

(12)

(OR)

2. a) State Hook’s law and Elastic limit. (3)

b) A square R.C.C column 300mm size is reinforced with 4 nos of 25mm

diameter bars. The permissible compressive stress in concrete is

5N/mm2 modular ratio of steel and concrete is 13.3. Determine the

maximum allowable load on the column.

(12)

UNIT-II

3. a) Define radius of gyration. (3)

b) Find the moment of inertia for a channel section 300mm × 150mm

× 20mm about it centroidal axis.

(12)

(OR)

4. a) State parallel axis theorem. (3)

b) Find the Ixx and Iyy for a given I section, also determine the section

modulus and radius of gyration about the centroidal axis.

(12)

2

UNIT-III

5. a) What are the different types of loads? (3)

b) Draw the SFD and BMD for the beam shown in figure: (12)

(OR)

6. a) What is shear stress? (3)

b) Draw the SFD and BMD for the beam show in fig. (12)

UNIT-IV

7. a) What are the assumptions made in theory of simple bending? (5)

b) A simply supported beam 5m long carries an UdL of 20kN/m if the

bending stress is not exceed 12N/mm2. Determine the depth of

rectangular section. Take b=200mm.

(10)

(OR)

8. a) What is the relation between slope, deflection and radius of curvature

of a simply supported beam?

(5)

b) A simply supported beam AB of span 5 meters is carrying a point load

of 30kN at a distance 3.75m from the left end A. Calculate the slopes at

A and B and deflection under the load. Take EI=26×1012N.mm2(Use

moment area method)

(10)

UNIT-V

9. a) What is circumferential stress? (3)

b) A spherical shell of 2m diameter is made up of 10mm thick plates.

Calculate the change in diameter and volume of the shell, when it is

subjected to an internal pressure of 1.6Mpa. Take E=200Gpa and

1/m=0.3

(12)

(OR)

10. a) What is difference between a thin cylindrical shell and a thick

cylindrical shell?

(3)

b) A compound cylinder is made by shrinking a tube of 160mm internal

diameter and 20mm thick over another tube of 160mm external

diameter and 20mm thick. The radial pressure at the common surface,

after shrinking is 8N/mm2. Find the final stresses setup across the

section, when the compound cylinder is subjected to an internal fluid

pressure of 60N/mm2

(12)

--------------------

5570

B.Sc. DEGREE EXAMINATION December 2014

(CONSTRUCTION MANAGEMENT)

(THIRD SEMESTER)

320: STRENGTH OF MATERIALS-I

Time: Three hours Maximum: 75 marks

Answer ONE FULL question from each UNIT (5 × 15 = 75)

UNIT-I

1. a) Define young’s modulus. (3)

b) A steel rod 25mm in diameter and 2m long is subjected to an axial pull

of 50kN. Find (i) the intensity of stress (ii) Elongation. Take

E=2×105N/mm2

(12)

(OR)

2. a) State Hook’s law and Elastic limit. (3)

b) A square R.C.C column 300mm size is reinforced with 4 nos of 25mm

diameter bars. The permissible compressive stress in concrete is

5N/mm2 modular ratio of steel and concrete is 13.3. Determine the

maximum allowable load on the column.

(12)

UNIT-II

3. a) Define radius of gyration. (3)

b) Find the moment of inertia for a channel section 300mm × 150mm

× 20mm about it centroidal axis.

(12)

(OR)

4. a) State parallel axis theorem. (3)

b) Find the Ixx and Iyy for a given I section, also determine the section

modulus and radius of gyration about the centroidal axis.

(12)

2

UNIT-III

5. a) What are the different types of loads? (3)

b) Draw the SFD and BMD for the beam shown in figure: (12)

(OR)

6. a) What is shear stress? (3)

b) Draw the SFD and BMD for the beam show in fig. (12)

UNIT-IV

7. a) What are the assumptions made in theory of simple bending? (5)

b) A simply supported beam 5m long carries an UdL of 20kN/m if the

bending stress is not exceed 12N/mm2. Determine the depth of

rectangular section. Take b=200mm.

(10)

(OR)

8. a) What is the relation between slope, deflection and radius of curvature

of a simply supported beam?

(5)

b) A simply supported beam AB of span 5 meters is carrying a point load

of 30kN at a distance 3.75m from the left end A. Calculate the slopes at

A and B and deflection under the load. Take EI=26×1012N.mm2(Use

moment area method)

(10)

UNIT-V

9. a) What is circumferential stress? (3)

b) A spherical shell of 2m diameter is made up of 10mm thick plates.

Calculate the change in diameter and volume of the shell, when it is

subjected to an internal pressure of 1.6Mpa. Take E=200Gpa and

1/m=0.3

(12)

(OR)

10. a) What is difference between a thin cylindrical shell and a thick

cylindrical shell?

(3)

b) A compound cylinder is made by shrinking a tube of 160mm internal

diameter and 20mm thick over another tube of 160mm external

diameter and 20mm thick. The radial pressure at the common surface,

after shrinking is 8N/mm2. Find the final stresses setup across the

section, when the compound cylinder is subjected to an internal fluid

pressure of 60N/mm2

(12)

--------------------

5570

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