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check your physical metallurgy knowledge : Random quiz 1

 q.1 : which of the two materuials do not respond well to induction hardening 

a) ferritic cast iron 

b) low carbon steel

c) medium carbon steel

d) pearlitic cast iron 


q.2 during solidification of cast iron graphatization is promoted by: 

a)  high carbon content 

b) high cooling rate 

c) presence of Cr

d) slow cooling rate. 


q3. spheroidal graphite is obtained in cast iron by:

a) inoculating the melt with ferrosilicon 

b) adding nickel to the melt in form of round shots 

c) trending rhe metls of controlled composition with magenisum 

d) annealing of flake graphite cast irons


q.4 : during recovery of a cold worked metal the dislocations 

a) multiply 

b ) largely disappear 

c) rearrange 


q.5: recrystallisation is more likely to occur if a material has first been 

a) cold worked

b) melted 

c) recovered


q.6 : the basic cause of grain growth is 

a) grain boundary energy 

b) small grains 

c) prolonged heating 


q.7 : during recovery, the vacancies are 

a) created 

b) completely removed 

c) equilibrium concentration 


q.8 : the flow curve of fcc crystal has three stages( two statements) 

a) stage one is characterized by high work hardening rate 

b) in stage 1, slip occurs on one slip system 

c) in stage II, slip occurs on multiple systems 

d) in stage II, dynamic recovery occurs 


q.9 : the elastic starins in copper is due to ( one statement) 

a) motion of dislocation 

b ) streching of atomic bonds 

c) breakage of atomic bonds 

d) none of the above 


q.10 : the most important property of steels for use in automobiles bodies is 

a) formability 

b ) yield strength

c ) toughness 

d) resilience 


ans : 1) a, b  ;;  2) a,d ;;  3) C ;;  4) c ;;  5) c ;; 6) a  ;; 7)  c ;; 

8) b,c ;; 9) b  ;; 10) a 


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