Building Materials, Third Edition

ƒ

™

—2g—2€

™ SI

41. Glazing of clay product is achieved by throwing sodium chloride in kiln at a temperature
    of
    (a) 600 – 800° C (b) 700 – 1000° C
    (c) 900 – 1100° C (d) 1200 – 1300° C


42. The bricks which are extensively used for basic refractories in furnaces are
    (a) chrome bricks (b) sillimanite bricks
    (c) magnesite bricks (d) fosterite bricks


43. Which one of the following procedure is applied to determine the soundness of bricks?
    (a) Immersing the bricks under water for 16 hrs and determining the quantity of water
    absorbed by the brick
    (b) Immersing the brick under water for 24 hrs and determining its expansion using Le
    Chatelier apparatus
    (c) Taking two bricks, hitting one against the other and observing whether they break or
    not and the type of sound produced while hitting
    (d) Scratching the brick by finger nail and noting whether any impression is made or not


44. The number of bricks required per cubic meter of brick masonry is
    (a) 400 (b) 450
    (c) 500 (d) 550

e)+,-2„—˜0,

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


2. (c) 12. (c) 13. (c) 14. (a) 15. (c) 16. (b) 17. (c) 18. (b) 19. (c) 20. (a)


3. (b) 22. (b) 23. (d) 24. (c) 25. (c) 26. (a) 27. (d) 28. (a) 29. (a) 30. (c)


4. (b) 32. (a) 33. (c) 34. (a) 35. (d) 36. (c) 37. (b) 38. (c) 39. (a) 40. (c)


5. (d) 42. (c) 43. (a) 44. (c)