Springs-basics

A spring used to absorb shocks and vibrations in automobiles is

• closely-coiled helical spring

• open-coiled helical spring

• torsion spring

• leaf spring

In a close coiled helical spring, the spring index (C) is given by D/d where D and d are the mean coil diameter and wire diameter respectively. For considering the effect of curvature, the Wahl’s stress factor K is given by

• (4C+4)/C

• {(4C-1)/(4C-4)} +{0.615/C}

• {(4C+1)/(4C+4)} +{0.615/C}

• {(4C-1)/(4C+4)}

Springs are used

• to absorb shocks and vibrations

• to store and release energy

• to measure force

• for any of the above functions

Spring index is

• ratio of coil diameter to wire diameter

• load required to produce unit deflection

• its capability of storing energy

• indication of quality of spring

Name the type of spring shown in picture

• helical compression spring

• multi-leaf spring

• spiral spring

• belleville spring

When the helical extension spring is subjected to axial tensile force, the type of stress induced in the spring wire is

• tensile stress

• compressive stress

• bending stress

• torsional shear stress

The spring operates

• within plastic limit

• within elastic limit

• Within fracture limit

• Any of the options

If a spring is cut down into two springs, the stiffness of cut springs will be

• half

• same

• double

• unpredictable

If two springs are in parallel then their overall stiffness will be

• half

• same

• double

• unpredictable

The stiffness of spring is,

• deflection per unit of axial force

• force per unit cross-sectional area of spring

• ratio of mean coil diameter to wire diameter

• force required to produce unit deflection