The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is _______________?

Related Mcqs:

1. 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...

2. Ferromagnetic alpha iron exists in temperature range of________________?

   A. below 723°C B. 770 – 910°C C. 910-1440°C D. 1400-1539°C E. above 1539°C...

3. The crystal of alpha iron is ____________________?

   A. body centred cubic B. face centred cubic C. hexagonal close packed D. cubic structure E. orthorhombic crystal...

4. 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...

5. 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 coal Submitted by: Faheem Zaman Dhaunroo...

6. Delta iron occurs at temperature of_______________?

   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...

7. 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...

8. In grey cast iron, carbon is present in the form of____________________?

   A. cementite B. free carbon C. flakes D. spheroids E. nodular aggregates of graphite...

9. 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...

10. Wrought iron is________________?

    A. hard B. high in strength C. highly resistant to corrosion D. heat treated to change its properties E. least resistant to corrosion...