A. 1539°C
B. 1601°C
C. 1489°C
D. 1712°C
E. 1131°C
Related Mcqs:
- The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?
A. 770°C
B. 910°C
C. 1050°C
D. below recrystallisation temperature
E. above recrystallization temperature - An important property of malleable cast iron in comparison to grey cast iron is the high___________________?
A. compressive strength
B. ductility
C. carbon content
D. hardness
E. surface finish - Paramagnetic alpha iron changes to gamma iron at_______________?
A. 770°C
B. 910°C
C. 1440°C
D. 1539°C
E. none of the above - Which of the following is mostly used used as blast furnace fuel for extracting pig iron from iron ores?
A. Brown coal
B. Anthracite coal
C. Hard coke
D. Woodchar coalSubmitted by: Faheem Zaman Dhaunroo
- At very low temperature, the melting and boiling temperatures become equal. This temperature is____________________?
A. 373°K
B. 273.16°K
C. 303°K
D. 0°K.
E. 300°K - Sulphur in pig iron tends to make it___________________?
A. hard’
B. soft
C. ductile
D. tough
E. malleable - Annealing of white cast iron results in production of_________________?
A. malleable iron
B. nodular iron
C. spheroidal iron
D. grey iron
E. none of the above - In nodular iron, graphite is in the form of_____________________?
A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite - The tensile strength of wrought iron is maximum _________________?
A. along the lines of slag distribution
B. perpendicular to lines of slag distribution
C. uniform in all directions
D. unpredictable
E. none of the above - Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio _____________________?
A. 50 : 20 : 20 : 10
B. 40 : 30 : 20 : 10
C. 50 : 20 : 10 : 20
D. 30 : 20 : 30 : 20
E. 50 : 10 : 20 : 20
