Building Materials, Third Edition

p2w  — QUW

Codes:
(a) A B C D (b) A B C D
2 143 3 1 24
(c) A B C D (d) A B C D
4 321 3 4 12

7. Consider the following statements:
   Soft varieties of pig iron are also known as
   
   
   1. foundry pig 2. grey pig
   
   
   2. forge pig 4. mottled pig
      Of these statements
      (a) 1, 2, 3 and 4 are correct (b) 1 alone is correct
      (c) 1 and 2 are correct (d) 3 and 4 are correct
   
   
   
   


8. Consider the following statements:
   Excess of sulphur in steel results in
   
   
   1. red shortness 2. segregation
   
   
   2. cold shortness
      Of these statements
      (a) 1 alone is correct (b) 2 alone is corret
      (c) 2 and 3 are correct (d) 1 and 2 are correct
   
   
   
   


9. The ratio of Young’s modulus of high tensile steel to that of mild steel is about
   (a) 0.5 (b) 1.0 (c) 1.5 (d) 2.0


10. Which of the following types of steels is used in the manufacture of rails?
    (a) Mild steel (b) Manganese steel
    (c) Cast steel (d) Bessemer steel


11. Vanadium steel is normally used in the manufacture of
    (a) axles and springs (b) ball bearings
    (c) magnets (d) railway switches and crossings


12. Tungsten steel is normally used in the manufacture of
    (a) drilling machines (b) heavy earth equipments
    (c) heavy mining equipments (d) delicate instruments


13. In mild steel the iron content is about
    (a) 50% (b) 80% (c) 90% (d) 99%


14. The ultimate tensile strength of mild steel in N/mm^2 is
    (a) 140 (b) 400 (c) 600 (d) 1000


15. The ultimate tensile strength of high carbon steel in N/mm^2 may be as high as
    (a) 600 (b) 1000 (c) 1500 (d) 2000

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1. (b) 2. (b) 3. (a) 4. (d) 5. (c) 6. (c) 7. (c) 8. (a) 9. (b) 10. (b)


2. (a) 12. (a) 13. (d) 14. (c) 15. (d)