139. Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of September 6, 2025 by Admin A. 90% tungsten carbide and 10% cobalt B. 70% aluminium oxide & 30% silica C. 30% nickel, 15% chromium & 55% tungsten D. 65% tungsten & 35% zirconium ✅ The correct answer is option A.