Carbon refractories are exclusively used in the_________________?
Carbon refractories are exclusively used in the_________________? A. Hearth of blast furnace B. Walls of coke oven C. Regenerators of coke oven D. Side wall of soaking pits
Carbon refractories are exclusively used in the_________________? A. Hearth of blast furnace B. Walls of coke oven C. Regenerators of coke oven D. Side wall of soaking pits
Silicon carbide refractories have very low ___________________? A. Refractoriness (< 1700°C) B. Thermal conductivity C. Resistance to thermal shockD. None of these
Refractory castables are used for__________________? A. Producing monolithic linings B. Patch work C. Minimising the number of joints in the structureD. All A., B. and C.
Which of the following has the lowest electrical resistivity ? A. Graphite B. Fireclay C. Alumina D. Zircon
Maximum water percentage in refractory mix meant for hand moulding may be as high as _____________ percent? A. 2-3 B. 5-7 C. 7-12D. 14-20
______________ bricks are used in the burning zone of a cement rotary kiln ? A. High alumina B. Fireclay C. Thoria D. Silicon carbide
Chrome magnesite is not used in the ____________________? A. Inner lining of L.D. converter B. Aluminium melting furnacesC. Wear out lining of steel melting furnaces D. All A., and B. and C.
The linear thermal expansion of _______________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent? A. Fireclay B. Silica C. Magnesite D. Corundum
Spalling of a refractory means its____________________? A. SofteningB. Fracture due to uneven expansion at high temperature C. Resistance to compressive loads D. Resistance to chemical action of gases and molten fluxes
Bauxite calcining rotary kilns are lined with ________________ bricks? A. Fireclay B. CarbonC. 85% alumina D. Corundum