Refractories are dried in the _______________?

Related Mcqs:

1. Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as ______________ percent?

   A. 10
   B. 15
   C. 20
   D. 30

2. Faster rate of drying of moulded refractories results in high _____________ of refractories?

   A. Green strength
   B. Voids
   C. Shrinkage
   D. Both B. and C.

3. Refractoriness/fusion points of ‘Superduty’ refractories is _______________ °C?

   A. 1520-1630
   B. 1630-1670
   C. > 1730
   D. > 2000

4. Presence of MgO in alumino-silicate refractories _______________ its refractoriness?

   A. Increases
   B. Lowers
   C. Does not affect
   D. Either A. or B.; depends on its quantity

5. The largest consumer of refractories is the _______________ industry?

   A. Cement
   B. Metallurgical
   C. Fertiliser
   D. Power

6. Porosity of fireclay refractories is _______________ percent?

   A. 5-10
   B. 10-25
   C. 25-35
   D. 35-50

7. Pure oxide refractories are generally monocrystalline in nature and are self bonded _______________ bricks are generally used as moderator in nuclear reactors?

   A. Beryllia
   B. Carborundum
   C. Corundum
   D. Thoria

8. Carbon refractories have very high __________________?

   A. Wetting characteristics
   B. Refractoriness
   C. Thermal conductivity
   D. Both B. and C.

9. RUL of refractories depends on the _____________________?

   A. Chemical composition
   B. Physical structure
   C. Presence of impurities like iron & alkali
   D. All A., B. and C.

10. Magnesite refractories are used for the construction of those furnaces, which are________________?

    A. Not required to resist the corrosive action of basic slag
    B. Not subjected to fluctuation in temperature
    C. Used for raising & maintaining high temperature
    D. Both B. and C.