Refractory materials are never used in the construction of _________________?

Related Mcqs:

1. 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...

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

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

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

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

4. Test piece for determination of RUL of a refractory is heated in a/an____________________?

   A. Oxidising atmosphere B. Reducing atmosphere C. Electric furnace D. Neutral atmosphere...

5. Spalling resistance of a refractory cannot be increased by ____________________?

   A. Increasing its porosity B. Using a coarser grog during its manufacture C. Decreasing its thermal co-efficient of expansion D. Making it denser...

6. Periclase refractory contains mainly________________?

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

7. Refractoriness under load (RUL) is the most important property for the refractory bricks_________________?

   A. At the hearth bottom of the furnace on which stock is placed B. Used for furnace insulation C. Used in the roof of the furnace D. None of these...

8. Pyrometric cone equivalent (PCE) of a refractory is the measure of its_________________?

   A. Spalling resistance B. Fusion point C. Resistance to slag penetration D. Resistance to carbon monoxide attack...

9. Addition of zircon to silica refractory brick improves its_____________________?

   A. Crushing strength B. Resistance to slag attack C. Both A. and B. D. Neither A. nor B....

10. Fusion point of a basic refractory material is__________________?

    A. Reduced by the addition of acid oxides B. Increased by the addition of acid oxides C. Not affected by the addition of acid oxides D. Always less than 1000°C...