Grog addition in fireclay during brick manufacture is done to Impart greater spalling resistance Enhance the strength of fired refractories Reduce its shrinkage on heating All of these TRUE ANSWER : ? YOUR ANSWER : ?
Sillimanite is a __________ refractory. Basic Insulating Neutral High alumina TRUE ANSWER : ? YOUR ANSWER : ?
Carborundum used for making crucibles for melting non-ferrous metals is chemically Crystalline magnesia Zirconium sulphate Silicon nitride Silicon carbide TRUE ANSWER : ? YOUR ANSWER : ?
Ramming masses are used for Obtaining monolithic working faces Repairing construction of various furnace parts Neither A nor B Both A & B TRUE ANSWER : ? YOUR ANSWER : ?
Si percentage in silica refractories used in the walls of coke oven is about 60 80 95 45 TRUE ANSWER : ? YOUR ANSWER : ?
Refractoriness/fusion points of 'superduty' refractories is __________ °C. > 1730 > 2000 1630-1670 1520-1630 TRUE ANSWER : ? YOUR ANSWER : ?
Magnesite refractories are generally not used in the Open hearth furnace Burning zone of cement kilns Steel melting furnace Electric furnace walls TRUE ANSWER : ? YOUR ANSWER : ?
Magnesite bricks are used in those parts of furnaces, which are None of these Required to resist corrosive basic slag Subjected to temperature fluctuation Subjected to high load TRUE ANSWER : ? YOUR ANSWER : ?
Chrome magnesite brick is not used for lining the Burning zone of limestone rotary kilns Coke oven regenerator Bottom hearth of reheating furnace Hearth of soaking pits TRUE ANSWER : ? YOUR ANSWER : ?
Roof of a basic open hearth furnace is lined with __________ bricks. Fireclay Magnesite Silica Dolomite TRUE ANSWER : ? YOUR ANSWER : ?