The cartesian equation of trajectory is(where u = Velocity of projection, α = Angle of projection, and x, y = Co-ordinates of any point on the trajectory after t seconds.)

Question: In a hardening process, the hypo-eutectoid steel is
[A].

heated from 30° C to 50° C above the upper critical temperature and then cooled in still air

[B].

heated from 30° C to 50° C above the upper critical temperature and then cooled suddenly in a suitable cooling medium

[C].

heated from 30° C to 50° C above the upper critical temperature and then cooled slowly in the furnace

[D].

heated below or close to the lower critical temperature and then cooled slowly

Answer: Option B

Explanation:

No answer description available for this question.