A. Obtaining monolithic working faces
B. Repairing construction of various furnace parts
C. Both A. & B.
D. Neither A. nor B.
Related Mcqs:
- Chrome magnesite is not used in the ____________________?
A. Inner lining of L.D. converter
B. Aluminium melting furnaces
C. Wear out lining of steel melting furnaces
D. All A., and B. and C. - Porosity is induced in insulating refractories by adding________________?
A. Powdered naphthalene
B. Ammonium chloride/sulphate
C. Calcium phosphate
D. All A., B. and C. - ‘Spinel’, a refractory mineral is chemically represented as____________________?
A. MgAl2O4
B. MgAl2O3
C. MgSO4
D. MgAl2O3.2H2O - Maximum alumina content in high alumina refractory can be as high as _____________ percent?
A. 30
B. 50
C. 70
D. 90 - Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory_________________?
A. Mortars
B. Cements
C. Castables
D. None of these - Which of the following bricks should not be used, if the furnace is to be used intermittently ?
A. Firebricks
B. Silica bricks
C. Silicon carbide bricks
D. Sillimanite - Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its_______________?
A. Non-wetting characteristic
B. High thermal conductivity
C. High crushing strength
D. None of these - Fireclay refractories have __________________?
A. Low co-efficient of thermal expansion
B. Poor thermal spalling resistance
C. Tendency to expand unduly high during firing
D. Very high cost - Which one contains minimum percentage of SiO2 ?
A. Firebrick
B. Sillimanite
C. Semi-silica
D. Aluminous firebrick - Silica bricks are never used for lining the____________________?
A. Beehive coke ovens
B. By-product coke ovens
C. Dome of blast furnace stoves
D. Roof of open hearth furnace
