Question

Consider the following quenching media.

1. Oil                              2. Water

3. Water + NaOH           4.Brine         

The correct sequence of these media in order of increasing hardness of steel undergoing heat treatment is

(a) 1,3,2,4                       (b) 2,1,3,4

(c) 1,2,3,4                       (d) 4,3,2,1