A. Oxidising atmosphere
B. Reducing atmosphere
C. Electric furnace
D. Neutral atmosphere
Related Mcqs:
- 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 - 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 - Which of the following bricks has the most close values of RUL and PCE ?
A. Silica bricks
B. Fireclay bricks
C. High alumina bricks
D. Tar dolomite bricks - RUL of refractories depends on the _____________________?
A. Chemical composition
B. Physical structure
C. Presence of impurities like iron & alkali
D. All A., B. and C. - . Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is ______________ °C?
A. 500
B. 1000
C. >1350
D. >2000 - Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?
A. Fireclay
B. Silica
C. Dolomite
D. Very low alumina - Segar cones are used for the determination of ____________ of refractories?
A. Softening temperature
B. Spalling resistance
C. Electrical conductivity
D. Resistance to slag attack - 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. - Dilatometer is used for the determination of ______________ of refractories?
A. Modulus of rupture
B. Permanent linear change
C. Resistance to CO attack
D. RUL - Spalling of a refractory means its____________________?
A. Softening
B. Fracture due to uneven expansion at high temperature
C. Resistance to compressive loads
D. Resistance to chemical action of gases and molten fluxes
