Mechanical Technology 91 Question Paper Exclusive Upd

Part B — Numerical & Problem Solving 11. A steel rod (E = 210 GPa) of length 2 m and cross-sectional area 500 mm² is loaded in tension with 20 kN. Calculate the elongation. 12. Calculate the moment of inertia of a rectangular section 100 mm × 50 mm about its centroidal horizontal axis. 13. A simply supported beam span 4 m carries a uniform load of 2 kN/m. Find the maximum bending moment. 14. Determine gear ratio if the driver has 20 teeth and the driven gear 60 teeth. 15. Convert 1200 rpm to rad/s. 16. A piston compresses air from 1 bar to 6 bar adiabatically with γ = 1.4. If initial volume is 0.02 m³, find final volume. 17. Calculate cutting speed (m/min) for a drill diameter 10 mm at 1200 rpm. 18. Find the stress concentration factor around a circular hole in a tension plate with given geometry (provide dimensions). 19. Compute the thermal expansion of a 1.5 m steel bar (α = 12 ×10^-6 /°C) for ΔT = 50°C. 20. Determine required torque to overcome friction for a screw with given lead and coefficient of friction (provide numbers).

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Unlike standard model papers found in textbooks, an "Exclusive" paper often features: Part B — Numerical & Problem Solving 11