Question No. 1

What is a spring?

Answer:                   

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

Question No. 2

State any two functions of springs.

Answer:

1. To measure forces in spring balance, meters and engine indicators.

2. To store energy.

Question No. 3

What are the various types of springs?

Answer:

1. Helical springs

2. Spiral springs

3. Leaf springs

4. Disc spring or Belleville springs

Question No. 4

What are the requirements of spring while designing?

Answer:

1. Spring must carry the service load without the stress exceeding the safe value.

2. The spring rate must be satisfactory for the given application.

Question No. 5

Classify the helical springs.

Answer:

1. Close-coiled or tension helical spring.

2. Open-coiled or compression helical spring.

Question No. 6

Define Leaf springs

Answer:

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

Question No. 7

Define Belleville Springs

Answer:

They are made in the form of a cone 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.

Question No. 8

What is spring index (C)?

Answer:

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

Question No. 9

What is pitch?

Answer:

The axial distance between adjacent coils in uncompressed state.

Question No. 10

What is solid length?

Answer:

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

            Ls = nt × d

Where, nt = total number of coils.