A. room temperature
B. above melting point
C. between 1400°C and 1539°C
D. between 910°C and 1400°C
E. none of the above
Delta iron occurs at temperature of_______________? Read More »
Engineering Materials A. below 10°K
B. above 100°K
C. around 0°C
D. around 100°C
E. above 1000°C
Super conduction by metals is observed in the temperature range of_________________? Read More »
Engineering Materials A. alpha iron, beta iron and gamma iron
B. alpha iron and beta iron
C. body centred cubic a-iron and face centred cubic a-iron
D. alpha iron, gamma from and delta iron
E. none of the above
Which of the following represents the allotropic forms of iron__________________? Read More »
Engineering Materials A. room temperature
B. near melting point
C. between 1400°C and 1539°C
D. between 910°C and 1400°C
E. none of the above
Gamma iron exits at following temperature___________________? Read More »
Engineering Materials A. ferrite
B. pearlite
C. anstenite
D. ferrite and cementite
E. ferrite and pearlite
Pure iron is the structure of_______________? Read More »
Engineering Materials A. 0.2%
B. 0.8%
C. 1.3%
D. 2%
E. 6.3%.
Cast iron is characterised by minimum of following %age of carbon_________________? Read More »
Engineering Materials A. in a random manner
B. in a haphazard way
C. in circular motion
D. back and forth like tiny pendulums
E. do not move
The molecules in a solid move______________? Read More »
Engineering Materials A. 770°C
B. 910°C
C. 1440°C
D. 1539°C
E. none of the above
Paramagnetic alpha iron changes to gamma iron at_______________? Read More »
Engineering Materials A. body centred cubic
B. face centred cubic
C. hexagonal close packed
D. cubic structure
E. orthorhombic crystal
The crystal structure of gamma iron is_________________? Read More »
Engineering Materials A. body centred cubic
B. face centred cubic
C. hexagonal close packed
D. cubic structure
E. orthorhombic crystal
The metallic structure of mild steel is_________________? Read More »
Engineering Materials