Question Set 34

Question No. 1

What is a spring?


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.


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?


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?


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.


1.     Close-coiled or tension helical spring.

2.     Open-coiled or compression helical spring.

Question No. 6

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.

Question No. 7

Define Belleville Springs


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)?


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?


The axial distance between adjacent coils in uncompressed state.

Question No. 10

What is solid length?


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.

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