__Khyber PakhtunKhwa Board of Technical Education Peshawar__

__Diploma of Associate Engineer __

__2 ^{nd} Year Architecture Technology (New Course)__

__Annual Examination 2012__

__Paper: - Structure Mechanics & R.C.C Design (AR-214)__

__Paper – A __

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**Time Allowed: - 03 Hours. Marks: -75**

__Note: -__**Attempt any five questions. Each question carries equal marks**.

**Q.1: -** **(a)** Explain modules of elasticity and give value for modules of elasticity for steel. (5)

**(b)** Draw stress –strain diagram for Mild steel and Define (10)

- i) Proportional Limit ii) Elastic Limit iii) Yield point
- iv) Ultimate Strength v) Rupture strength and actual rupture strength

**Q.2: - (a)** State the difference between Stress & Simple Stress. (5)

**(b)** An elastic rod 15 mm in diameter & 20 m long extend by 2mm under a Tensile load of 60 KN.

Find the Intensity of stress & strain. (10)

**Q.3: - (a)** Describe the difference between Centre of Gravity and Centroid. (5)

**(b)** Find the position of centre of Gravity for a T-Section, 200 mm wide x 100 mm deep. (10)

Overall Thickness of Flange = 9mm

Thickness of Web = 7.8mm

**Q.4: -** **(a)** Explain the term moment of Inertia. (5)

**(b)** Find the moment of Inertia for a hollow shaft 8 cm internal diameter and 10cm external

diameter (10)

- about its diameter
- section modules

**Q.5: - (a)** Define Shear Force & Shear Stress (5+5+5)

**(b)** Define Bending stress & bending moment

**(c)** Define Centilever beam & continuous beam

**Q.6: - (a)** A simply supported beam of 10m length carrier a U.D.L of 3 t/m over the entire span.

Calculate and draw the S.F and B.M diagram. (10)

**(b)** State conditions for Equilibrium of a beam. (5)

**Q.7: - (a)** Define Deflection of beams. (5)

**(b)** A cantilever 12cm wide and 20cm deep is 2.5m long, what U.D.L should the beam

carry to produce a deflection of 0.5cm at the free end. Take E = 2x10^{6 }Kg/cm^{2} (10)

**Q.8: - ** Write note on the following terms: - (5+5+5)

- a) Modules of Rigidity & poisons Ratio
- b) Bending Equations
- c) Applied Mechanics and Structural Mechanics

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