Machine Design MCQs

When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor and W = Axial compressive load on the spring)

Which of the following has threads at both ends?

The material generally used for aircraft components is

A tapered key which fits in a key way in the hub and the bottom of which is shaped to fit the curved surface of the shaft, is known as,

In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

According to Indian standards, total numbers of fundamental deviations are

Resistance to fatigue of a material is measured by

The resistance to fatigue of a material is measured by

Allen bolts are