engineering recuitment ISRO Scientist Mechanical Mock Test Engineering Materials Science Heat Treatment Process
Consider the following statements regarding heat treatment processes:
1. Tempering is a process of annealing bainite at low temperatures.
2. Machine tool guideways are hardened by flame hardenings
3. The aim of full annealing is to reduce ductility and resilience.
4. Guideways of lathe beds are hardened by carburising.
Which of the given statements are INCORRECT?
1
1, 2 and 4
2
1, 3 and 4
3
1, 2 and 3
4
2, 3 and 4