The presence of sulphur in pig iron makes__________________?

Related Mcqs:

1. Sulphur in pig iron tends to make it___________________?

   A. hard’
   B. soft
   C. ductile
   D. tough
   E. malleable

2. 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

3. The percentage of carbon in pig iron varies from___________________?

   A. 0.1 to 1.2%
   B. 1.5 to 2.5%
   C. 2.5 to 4%
   D. 4 to 4.5%
   E. 4.5 to 6.3%.

4. Pig iron is the name given to________________?

   A. raw material for blast furnace
   B. product of blast furnace made by reduction of iron ore
   C. iron containing huge quantities of carbon
   D. iron in molten form in the ladles
   E. iron scrap

5. 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

6. 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

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. Sulphur in steel________________?

   A. acts as deoxidiser
   B. reduces the grain size
   C. decreases tensile strength and hardness
   D. lowers the toughness and transverse ductility
   E. increases hardness

9. Which is not correct statement about effect of sulphur in fuel ___________________?

   A. it has heating value
   B. it helps in electrostatic precipitation of ash in flue-gases
   C. it leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
   D. it erodes furnace walls
   E. none of the above

10. Sulphur in coal results in___________________?

    A. causing clinkering and slagging
    B. corroding air heaters
    C. spontaneous combustion during coal storage
    D. facilitating ash precipitation
    E. all of the above