The solid length of a spring is the product of total number of coils and the diameter of the wire

The spring index is the ratio of mean diameter of the coil to the diameter of the wire

The spring stiffness is the load required per unit deflection of the spring

The pitch of the coil is the axial distance between adjacent coils in the compressed state

3 mm

6 mm

8 mm

12 mm

Correct

Incorrect

Yes

No

Unknown

None

0.20 to 0.40%

0.35 to 0.45%

0.40 to 0.60%

none of these