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

Related Mcqs:

1. Which of the following does not occur during firing/burning of refractories ?

   A. Removal of water of hydration
   B. Vitrification
   C. Decrease in crushing strength
   D. Development of stable mineral form

2. The maximum linear expansion of silica bricks during firing is about ______________ percent?

   A. 0.5
   B. 1
   C. 2
   D. 3.5

3. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?

   A. 55
   B. 70
   C. 80
   D. 90

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

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

5. Refractories are dried in the _______________?

   A. Rotary kilns
   B. Tunnel kilns
   C. Sun
   D. None of these

6. Maximum alumina content in high alumina refractory can be as high as _____________ percent?

   A. 30
   B. 50
   C. 70
   D. 90

7. Maximum water percentage in refractory mix meant for hand moulding may be as high as _____________ percent?

   A. 2-3
   B. 5-7
   C. 7-12
   D. 14-20

8. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of ______________ percent respectively?

   A. 80 and 20
   B. 20 and 80
   C. 50 and 50
   D. 60 and 40

9. Which brick undergoes maximum shrinkage on drying ?

   A. Tar bonded dolomite bricks
   B. Fireclay bricks
   C. Magnesite bricks
   D. Chromite bricks

10. Porosity of fireclay refractories is _______________ percent?

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