A. 35-40
B. 55-60
C. 80-85
D. > 94
Related Mcqs:
- Which one contains minimum percentage of SiO2 ?
A. Firebrick
B. Sillimanite
C. Semi-silica
D. Aluminous firebrick - 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 - Fusion temperature of pure silica (SiO2) is _______________ °C?
A. 1350
B. 1715
C. 2570
D. 2800 - Si percentage in silica refractories used in the walls of coke oven is about______________________?
A. 45
B. 60
C. 80
D. 95 - Maximum water percentage in refractory mix meant for hand moulding may be as high as _____________ percent?
A. 2-3
B. 5-7
C. 7-12
D. 14-20 - Which one contains maximum percentage of Al2O3 ?
A. Firebrick
B. Sillimanite
C. Magnesite
D. Aluminous firebrick - Use of higher percentage of lime for bonding silica bricks, reduces their__________________?
A. Strength
B. Abrasion resistance
C. Both A. & B.
D. Neither A. nor B. - Chrome magnesite bricks are used in the_________________?
A. Side walls of soaking pits and arc furnaces
B. Copper melting furnaces & converters
C. Burner block of glass tanks
D. All A., B. and C. - Chrome magnesite brick is not used for lining the___________________?
A. Hearth of soaking pits
B. Bottom hearth of reheating furnace
C. Coke oven regenerator
D. Burning zone of limestone rotary kilns - A steel member used in the furnace construction to take the thrust of the brickwork is called___________________?
A. Buckstay
B. Breast wall
C. Armouring
D. Baffle
