Grey cast iron_____________________?

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. 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

3. 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

4. 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%.

5. 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

6. An important property of high silicon (12 – 18%) cast iron is the high__________________?

   A. tenacity
   B. brittleness
   C. plasticity
   D. corrosion resistance
   E. hardness

7. 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

8. Cast iron has_________________?

   A. high tensile strength
   B. its elastic limit close to the ultimate breaking strength
   C. high ductility
   D. all of the above
   E. none of the above

9. 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%.

10. Ductile cast iron___________________?

    A. contains 1.7 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 creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material
    E. none of the above