Question

  Match List – I (Heat treatment) with List – II (Effect on the properties) and select the correct answer using the codes given below the lists:                                         

         List – I

A. Annealing

B. Nitriding

C. Martempering

D. Normalising

         List – II

1. Refined grain structure

2. Improves the hardness of the whole mass

3. Increases surface hardness

4. Improves ductility

Codes:

             A        B         C         D

(a)        4        3          2          1

(b)         1        3          4          2

(c)          4        2          1          3

(d)          2        1          3          4