A. Bottom of soaking pits
B. Between acid & basic linings in basic open hearth furnaces to prevent their chemical action
with each other
C. Both A. & B.
D. Neither A. and B.
Related Mcqs:
- 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 - Chromite refractories are_____________________?
A. Acidic refractory
B. Neutral refractory
C. Basic refractory
D. Fired at a temperature of 600°C only - Faster rate of drying of moulded refractories results in high _____________ of refractories?
A. Green strength
B. Voids
C. Shrinkage
D. Both B. and C. - Chromite refractories_____________________?
A. Are bonded with lime and clay
B. (Free from silica) have better thermal fatigue resistance than silica and magnesite refractories.
C. Are resistant to basic slag
D. All A., B. and C. - Si percentage in silica refractories used in the walls of coke oven is about______________________?
A. 45
B. 60
C. 80
D. 95 - Silicon carbide refractories have very low ___________________?
A. Refractoriness (< 1700°C)
B. Thermal conductivity
C. Resistance to thermal shock
D. None of these - Zircon refractories have__________________?
A. Low co-efficient of expansion
B. High RUL (1600°C) and refractoriness (> 2000°C)
C. High spalling resistance
D. All A., B. and C. - The main raw material for manufacture of silicon carbide refractories is_________________?
A. Corundum
B. Carborundum
C. Bauxite
D. Periclase - Cold crushing strength of refractories depends upon its_________________?
A. Composition
B. Texture
C. Firing temperature
D. All A., B. and C. - 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
