1. The steel with 0.83% carbon when heated at 723°C is converted into microstructure:
(A) Ferrite
(B) Cementite
(C) Austenite
(D) Pearlite
2. B.C.C contains number of atoms:
(A) 5
(B) 9
(C) 8
(D) 14
3. F.C.C contains number of atoms:
(A) 5
(B) 8
(C) 9
(D) 14
4. The carbon steel is cooled down in hardening process:
(A) In air
(B) In furnace
(C) In water
(D) In fused salt
5. Tempering is done:
(A) None of these
(B) Before quenching
(C) Along quenching
(D) After quenching