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

Related Mcqs:

1. Water content in ground refractory material to be shaped into bricks by hand moulding is about ______________ percent?

   A. 5
   B. 20
   C. 40
   D. 55

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

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

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. Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?

   A. Pottery furnace
   B. Glass melting furnace
   C. Crucibles
   D. Gas retorts

5. Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory_________________?

   A. Mortars
   B. Cements
   C. Castables
   D. None of these

6. Machine moulding of dry mixture of refractories requires a pressure of the order of _____________ kg/cm2?

   A. 10
   B. 100
   C. 500
   D. 1000

7. 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

8. Thermal diffusivity of a refractory brick is high, when its ____________ is high?

   A. Density
   B. Specific heat
   C. Thermal conductivity
   D. None of these

9. 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

10. Which furnace consumes maximum refractory annually in an integrated steel plant ?

    A. Soaking pit
    B. Blast furnace
    C. L.D. converter
    D. Coke ovens