Q1: A spring material should have low

ANS:D - none of these

When it comes to spring materials, none of the provided options are accurate for describing desirable characteristics. Instead, a spring material should possess specific attributes to perform effectively in its intended application. These attributes include:

1. High Elastic Limit: A spring material should have a high elastic limit, which is the maximum stress it can withstand without undergoing permanent deformation. This ensures that the spring can endure significant loads without being permanently damaged.
2. High Fatigue Resistance: Fatigue resistance is crucial for spring materials because they often undergo cyclic loading during operation. A material with high fatigue resistance can withstand repeated loading and unloading cycles without developing cracks or failures over time.
3. High Yield Strength: Yield strength is the stress at which a material begins to deform plastically. A spring material with a high yield strength can handle higher loads before plastic deformation occurs, ensuring the spring remains within its elastic range.