Alpha iron is stable ______________ °C?

Related Mcqs:

1. ______________ iron is produced, when molten pig iron is allowed to cool gradually?

   A. White cast
   B. Grey cast
   C. Wrought
   D. None of these

2. White cast iron as compared to grey cast iron is ________________?

   A. More durable
   B. Very brittle
   C. Very hard
   D. All A., B. & C.

3. _____________ iron is produced, when molten pig iron is chilled suddenly?

   A. White cast
   B. Grey cast
   C. Wrought
   D. None of these

4. The impure iron (pig iron) that is tapped out from blast furnace contains about _____________ percent carbon?

   A. 0.2
   B. 2
   C. 4
   D. 8

5. Maximum carbon content in cast iron is ______________ percent?

   A. 3.8
   B. 5.2
   C. 4.8
   D. 4.3

6. Cast iron is a ______________ material?

   A. Brittle
   B. Ductile
   C. Tough
   D. Malleable

7. Wrought iron is a suitable material of construction for handling _____________ solutions?

   A. Dilute acidic
   B. Concentrated acidic
   C. Alkalis & alkaline
   D. None of these

8. Silicon percentage in iron castings to have maximum hardness should be about__________________?

   A. 0.3
   B. 0.5
   C. 0.8
   D. 2.5

9. Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ?

   A. Invar
   B. Constantan
   C. Chromel
   D. Alumel

10. Cast iron has____________________?

    A. High ductility
    B. High malleability
    C. Very high tensile strength
    D. Its elastic limit very close to ultimate breaking strength