In nodular iron, graphite is in the form of_____________________?

Related Mcqs:

1. Nodular iron has____________________?

   A. high maehinability
   B. low melting point
   C. high tensile strength
   D. good fluidity
   E. all of the above

2. 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

3. 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

4. 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

5. Which of the following element results in presence of free graphite in C.I_________________?

   A. carbon
   B. sulphur
   C. silicon
   D. manganese
   E. phosphorous

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. 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

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

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

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

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

10. Induction hardening is the process of_____________________?

    A. hardening surface of workpiece to ob-tain hard and wear resistant surface
    B. heating and cooling rapidly
    C. increasing hardness throughout
    D. inducing hardness by continuous process
    E. hardening core