The building up of worn and undersized parts, subjected to repeated loads by electroplating is

Electroplating is commonly used to build up worn or undersized parts, such as shafts, pins, and journals.

While it restores dimensions and improves corrosion resistance, it does not significantly improve or reduce fatigue strength.

The fatigue strength largely depends on the base material, surface finish, and residual stresses.
Option Reason
A. Best method Not always — other methods like thermal spraying or metal spraying may be better for fatigue or heavy loads.
B. Extremely hazardous False — it is a well-established and safe process when done correctly.
D. Cheapest method Not necessarily — it can be more expensive than welding or metal spraying for large areas.