Gamma iron exits at following temperature___________________?

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. 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

3. 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

4. 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

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. Cast iron is characterised by minimum of following %age of carbon_________________?

   A. 0.2%
   B. 0.8%
   C. 1.3%
   D. 2%
   E. 6.3%.

7. Blast furnace produces following by reduction of iron ore_______________?

   A. cast iron
   B. pig iron
   C. wrought iron
   D. malleable iron
   E. white iron

8. 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

9. The unique property of cast iron is its high ___________________?

   A. malleability
   B. ductility
   C. surface finish
   D. damping characteristics
   E. hardness

10. Carbon in iron is an example of__________________?

    A. substitutional solution
    B. interstitial solid solution
    C. intermetallic compounds
    D. all of the above
    E. none of the above.