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19.

The following types of materials are usually the most ductile                        
A. face-centred cubic lattice B. body-centred cubic lattice
C. hexagonal close-packed lattice D. all of the above



20.

Pure iron is the structure of                        
A. ferrite B. pearlite
C. anstenite D. ferrite and cementite



21.

The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is                        
A. 770°C B. 910°C
C. 1050°C D. below recrystallization temperature




22.

Gamma iron exits at following temperature                        
A. room temperature B. near melting point
C. between 1400°C and 1539°C D. between 910°C and 1400°C



23.

Ferromagnetic alpha iron exists in temperature range of                        
A. below 723°C B. 770 - 910°C
C. 910-1440°C D. 1400-1539°C



24.

Paramagnetic alpha iron changes to gamma iron at                        
A. 770°C B. 910°C
C. 1440°C D. 1539°C



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