The metal suitable for making bearings that are subjected to heavy load is

Question

Question

This question was previously asked in

JKSSB JE ME 2015 Official Paper

Answer 1

Explanation:

White metal or Babbit metal:

The white metal is used for making bearings that are subjected to heavy load.
The white metal is an alloy of Lead and Lithium metal.
These alloys usually consist of relatively hard crystals embedded in a softer matrix, a structure important for machine bearings.
They are composed primarily of tin, copper, and antimony, with traces of other metals added in some cases and lead substituted for tin in others.
The alkali metals are quite useful.

Phosphorous bronze:

Phosphorous bronze contains 90% copper, 9.7% tin and 0.3% phosphorus.
The box nut or replaceable nut of a bench vice is made up of phosphorous bronze.

Monel metal:

Monel metal is an important alloy of nickel and copper.
It contains 68% nickel, 29% copper, and 3% other constituents like iron, manganese, silicon, and carbon.
It resembles nickel in appearance and is strong, ductile, and tough. It is superior to brass and bronze in corrosion-resisting properties.
It is used for making propellers, pump fittings, condenser tubes, steam turbine blades, seawater exposed parts, tanks, and chemical and food handling plants.