Question Set 35

Question No. 1

What are the end conditions of spring?

Answer:

1.     Plain end.

2.     Plain and ground end

3.     Squared end

4.     Squared and ground end.

Question No. 2      

What is buckling of springs?

Answer:

The helical compression spring behaves like a column and buckles at a comparative small load when the length of the spring is more than 4 times the mean coil diameter.

Question No. 3

What is surge in springs?

Answer:

The material is subjected to higher stresses, which may cause early fatigue failure. This effect is called as spring surge.

Question No. 4

What is a laminated leaf spring?

Answer:

In order to increase, the load carrying capacity, number of flat plates are placed and below the other.

Question No. 5

What are semi elliptical leaf springs?

Answer:

The spring consists of number of leaves, which are held together by U-clips.

The long leaf fastened to the supported is called master leaf. Remaining leaves are called as graduated leaves.

Question No. 6

What is nipping of laminated leaf spring?

Answer:

Pre-stressing of leaf springs is obtained by a difference of radii of curvature known as nipping.

Question No. 7

What are the various applications of springs?

Answer:

The springs are used in various applications, they are

1.     Used to absorb energy or shocks (e.g. shock absorbers, buffers, etc.)

2.     To apply forces as in brakes clutches, spring-loaded valves, etc.

3.     To measure forces as in spring balances and engine indicators

4.     To store energy as in watches

Question No. 8

Define free length.

Answer:

Free length of the spring is the length of the spring when it is free or unloaded condition. It is equal to the solid length plus the maximum deflection or compression plus clash allowance.

Lf = solid length + Ymax + 0.15 Ymax

Question No. 9

Define spring index.

Answer:

Spring index (C) is defined as the ratio of the mean diameter of the coil to the diameter of the wire.

C =D/d

Question No. 10

Define spring rate (stiffness).

Answer:

The spring stiffness or spring constant is defined as the load required per unit deflection of the spring.

K= W/y

Where, W - Load

            y - Deflection