The crystal of alpha iron is ____________________?

Related Mcqs:

1. 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

2. 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

3. 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

4. The crystal structure of gamma iron is_________________?

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

5. 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

6. 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

7. Iron is ____________________?

   A. paramagnetic
   B. ferromagnetic
   C. ferroelectric
   D. dielectric
   E. none of the above

8. The crystal structure of brass is_________________?

   A. F.C.C.
   B. B.C.C.
   C. H.C.P.
   D. Orthorhombic crystalline structure
   E. none of the above

9. The percentage of carbon in grey iron castings usually varies between __________________?

   A. 0.5 to 1%
   B. 1 – 2%
   C. 2.5 to 4.5%
   D. 5 – 7%
   E. 7-9%.

10. Pure iron is the structure of_______________?

    A. ferrite
    B. pearlite
    C. anstenite
    D. ferrite and cementite
    E. ferrite and pearlite