Segar cones are used for the determination of ____________ of refractories?

Related Mcqs:

1. Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be __________________?

   A. Oxidising
   B. Neutral
   C. Either A. or B.
   D. Neither A. nor B.

2. PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of ____________ °C?

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

3. 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

4. Dilatometer is used for the determination of ______________ of refractories?

   A. Modulus of rupture
   B. Permanent linear change
   C. Resistance to CO attack
   D. RUL

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

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

6. Refractoriness of a typical silica brick corresponds to Segar cone number, ’32’, which is equivalent to a temperature of _____________ °C?

   A. 1380
   B. 1520
   C. 1710
   D. 1915

7. 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

8. Si percentage in silica refractories used in the walls of coke oven is about______________________?

   A. 45
   B. 60
   C. 80
   D. 95

9. Cold crushing strength of refractories depends upon its_________________?

   A. Composition
   B. Texture
   C. Firing temperature
   D. All A., B. and C.

10. 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