A. Resistance to abrasion
B. Resistance to slag penetration
C. Stability of volume at high temperature
D. Resistance to corrosion by slag
Related Mcqs:
- Faster rate of drying of moulded refractories results in high ______________ of refractories?
A. Green strength
B. Voids
C. Shrinkage
D. Both B. and C. - Hot metal runner in blast furnace are lined with ______________ bricks?
A. Silica
B. Carborundum
C. Fireclay
D. Magnesite - Outer combustion chamber of blast furnace stove is lined with _______________ bricks?
A. Fireclay
B. Silica
C. Chrome magnesite
D. Zirconia - Refractoriness/fusion points of ‘Superduty’ refractories is _____________ °C?
A. 1520-1630
B. 1630-1670
C. > 1730
D. > 2000 - Magnesite refractories are generally not used in the__________________?
A. Electric furnace walls
B. Steel melting furnace
C. Open hearth furnace
D. Burning zone of cement kilns - Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to__________________?
A. Thermal spalling
B. Slag attack
C. Fusion under load
D. CO attack - Panel test determines the ______________ of refractories?
A. Fusion point
B. Spalling resistance
C. Slag penetration resistance
D. Refractoriness under load (RUL) - Chemically, mullite refractories is________________?
A. 3Al2O3.2SiO2
B. Al2O3
C. ZrSO4
D. ThO2 - Presence of MgO in alumino-silicate refractories ______________ its refractoriness ?
A. Increases
B. Lowers
C. Does not affect
D. Either A. or B.; depends on its quantity - Magnesite refractories are used for the construction of those furnaces, which are_______________?
A. Not required to resist the corrosive action of basic slag
B. Not subjected to fluctuation in temperature
C. Used for raising & maintaining high temperature
D. Both B. and C.
