Q1: Which of the following is not used as a bearing material ?

ANS:D - Cermets

Cermets are not typically used as a bearing material. Cermets are composite materials composed of ceramic particles embedded in a metallic matrix. While they offer advantages such as high hardness, wear resistance, and thermal stability, they are not commonly used as bearing materials in traditional bearing applications. On the other hand, copper-lead alloys, babbits, and bronzes are all commonly used as bearing materials due to their favorable mechanical properties, including good load-bearing capacity, low friction, and resistance to wear. These materials have been used for many years in various bearing applications, ranging from automotive engines to industrial machinery.