What is the correct answer?


The stiffness of a closely coiled helical spring subjected to an axial load W is equal to (where G = Modulus of rigidity, and n = Number of active coils)

A. Gd⁴/ 8D3n

B. Gd3/ 8D3n

C. Gd⁴/ 4D3n

D. Gd⁴/ 8D²n

Correct Answer :

A. Gd⁴/ 8D3n

Related Questions

Idler pulley is used for The shearing stresses in the inner face as compared to outer face of the… The condition for maximum power transmission is that the maximum tension… According to I.B.R., the distance between the rows of rivets, for equal… The size of a cam depends upon The shock resistance of steel is increased by adding A special case of ductility which permits materials to be rolled or hammered… When the shaft rotates in anticlockwise direction at slow speed in a bearing,… Which is positive drive? In designing a connecting rod, it is considered like __________ for buckling… The arms of the pulleys for flat belt drive have The acme threads are usually found on In thrust bearings, the load acts A column is known as a long column if the slenderness ratio is The resistance to fatigue of a material is measured by The design of shafts made of brittle materials is based on If T is the actual number of teeth on a helical gear and φ is the… Which of the following has threads at both ends? A steel containing 0.8% carbon is known as When a material is subjected to fatigue loading, the ratio of the endurance… The standard length of the shaft is In cylindrical cams, the follower moves The included angle between the sides of V-belt is An elastic bar is fixed at the upper end and loaded at the lower end by… In replacing the V-belts, a complete set of new belts is used instead… In the levers of first type, the mechanical advantage is __________ one. A bolt of uniform strength can be developed by The usual clearance provided in hydrodynamic bearing per mm of diameter… A bolt of M 24 × 2 means that Auto frettage is the method of