In malleable iron, carbon is present in the form of___________________?

Related Mcqs:

1. 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

2. Malleable cast iron _________________?

   A. contains l.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron
   B. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable
   C. is produced by annealing process. It is soft, tough, and easily machined metal
   D. is produced by small additions of magnesium (or cerium) in the ladle. Graphite is in the nodular or spheroidal form and is well dispersed throughout the material
   E. none of the above

3. 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

4. White cast iron contains carbon in the form of__________________?

   A. free carbon
   B. graphite
   C. cementite
   D. white carbon
   E. ferrite

5. Compressive strength of grey cast iron in tonnes/cm is of the order of___________________?

   A. 3- 5
   B. 5-7
   C. 7-10
   D. 10-15
   E. 15-22

6. 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

7. 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

8. 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%.

9. 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.

10. In mottled cast iron, carbon is available in__________________?

    A. free form
    B. combined form
    C. nodular form
    D. flat form
    E. partly in free and partly in combined state