Mechanical Technology 91 Question Paper Exclusive 【CERTIFIED — 2026】

MIG/MAG, TIG, and MMAW structural welding techniques.

Focuses on terminology, safety symbols, and tool identification.

The is a technical, rewarding exam. By focusing on the core areas of joining, metal removal, and drafting, and by practicing with authentic, exclusive study materials, students can secure excellent marks. mechanical technology 91 question paper exclusive

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Provide full worked solutions for numeric problems, clear step-by-step reasoning, and annotated drawings for Part C. Include unit checks and common mistake notes.

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). By focusing on the core areas of joining,

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Differentiate between ductility, malleability, hardness, and toughness.