______________________ is used as a material of construction for the blade of power saw ?
Correct answer: D. High speed steel
- A. Wrought iron
- B. Stainless steel
- C. Mild steel
- D. High speed steel
Explanation
High-speed steel retains hardness at the high temperatures produced during sawing, so it remains effective as a power-saw blade. Mild steel and wrought iron soften more readily, while stainless steel is selected mainly for corrosion resistance.
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