### Interview Questions (Design of Machine Design - Springs)

**What is spring?**

Spring is an elastic member, which deflects, or distorts under the action of load and regains its original shape after the load is removed.

**State any two functions of springs.**

- To measure forces in spring balance, meters and engine indicators.
- To store energy.

**What are the various types of springs?**

- Helical springs
- Spiral springs
- Leaf springs
- Disc spring or Belleville springs

**What are the requirements of spring while designing?**

- Spring must carry the service load without the stress exceeding the safe value.
- The spring rate must be satisfactory for the given application.

**Classify the helical springs.**

- Close - coiled or tension helical spring.
- Open -coiled or compression helical spring.

**Define Leaf springs.**

A leaf spring consists of flat bars of varying lengths clamped together and supported at both ends, thus acting as a simply supported beam.

**What is the spring index (C)?**

The ratio of mean or pitch diameter to the diameter of wire for the spring is called the spring index.

**Define Belleville Springs.**

They are made in the form of a coned disc to carry a high compressive force. In order to improve their load carrying capacity, they may be stacked up together. The major stresses are tensile and compressive.

**What is the pitch?**

The axial distance between adjacent coils in the uncompressed state.

**What is the solid length?**

The length of a spring under the maximum compression is called its solid length. It is the product of the total number of coils and the diameter of a wire.

Where, n

_{t =}total number of coils.

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