Question

Which of the following copper alloys is used for the manufacture of springs and suspension filaments in electrical instruments?

• A. Bronze
• B. Aluminium bronze
• C. German silver
• D. Phosphorus bronze

Answer 1

The Correct Option is D

The question asks which copper alloy is used for the manufacture of springs and suspension filaments in electrical instruments. Let's analyze each option:

1. Bronze: This is an alloy consisting primarily of copper, usually with tin as the main additive. While bronze is known for its hardness and resistance to corrosion, it is not specifically used for springs and suspension filaments in electrical instruments.
2. Aluminium bronze: This alloy contains a mix of copper and aluminum. It is known for its high strength and corrosion resistance, especially in marine environments. However, it is not typically used in electrical instruments for the applications mentioned in the question.
3. German silver: Also known as nickel silver, this alloy consists of copper, nickel, and zinc. It is used for its corrosion resistance and is often found in musical instruments and jewelry, but again, not for springs and suspension filaments in electrical instruments.
4. Phosphorus bronze: This alloy contains copper, tin, and a small amount of phosphorus. It is known for its toughness, corrosion resistance, and excellent fatigue resistance, making it ideal for springs, bearings, and suspension filaments in electrical instruments.

Based on the properties of the alloys described above, Phosphorus bronze is the correct answer as it is specifically used for its excellent fatigue resistance and flexibility, making it suitable for the manufacture of springs and suspension filaments in electrical instruments.