Panel test determines the _____________ of refractories?

Related Mcqs:

1. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at ______________ °C for 24 hours?

   A. 700
   B. 1000
   C. 1600
   D. 2000

2. Spray test determines the _____________ of refractories?

   A. Resistance to slag penetration
   B. Resistance to CO attack
   C. RUL
   D. Permanent linear change

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

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

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

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

5. Silicon carbide refractories are used in the _____________?

   A. Muffle furnace
   B. Zinc smelting furnace
   C. Ceramic recuperators
   D. All A., B. and C.

6. Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?

   A. Fireclay
   B. Carborundum
   C. Graphite
   D. Chromite

7. Pyrometric cone equivalent (PCE) value (Segar cone) of ‘Superduty refractories’ is more than 33 which corresponds to a temperature of _____________ °C?

   A. 1520
   B. 1630
   C. 1670
   D. 1730

8. 10 to 30% magnesite is added to Chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the _____________ of Chromite?

   A. Spalling resistance
   B. Refractoriness
   C. Crushing strength
   D. Resistance to slag

9. 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

10. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns ?

    A. 1800
    B. 2200
    C. 2400
    D. 2700