_____________ is not a single oxide-refractory?

Related Mcqs:

1. Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of______________?

   A. Segar cones B. Muffles for muffle furnaces C. Insulating bricks D. Crucibles used for melting of high purity metals...

2. Highest melting (m.p = 3070°C) oxide refractory is__________________?

   A. Alumina B. Thoria C. Zirconia D. Magnesia...

3. 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...

4. 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...

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

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

6. Sillimanite is a _____________ refractory?

   A. Basic B. Neutral C. High alumina D. Insulating...

7. The highest melting pure oxide (m.p. > 3000°C)is___________________?

   A. Thoria B. Alumina C. Beryllia D. Zirconia...

8. 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...

9. Mixing of ground refractory material and water is done in a ______________ mill?

   A. Pug B. Ball C. Tube D. Rod...

10. Periclase refractory contains mainly________________?

    A. CaO B. MgO C. Al2O3 D. SiO2...