39102. Which of the following is not a neutral refractory ?
39103. Which is a basic refractory ?
39104. Cold crushing strength of a refractory does not depend upon its
39105. Refractoriness under load (RUL) is the most important property for the refractory bricks
39106. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?
39107. __________ nozzles are used in continuous casting of steel,
39108. silicon carbide refractories have very low
39109. Basic bricks are not made of
39110. With increase in the alumina content in firebricks, its fusion point (refractoriness)
39111. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2 . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm2 .
39112. Zirconia refractory
39113. Which one contains maximum percentage of Al2O3 ?
39114. Which of the following does not occur during firing/burning of refractories ?
39115. Silicon carbide refractories are used in the
39116. High density refractory bricks have lower
39117. Silliminite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in
39118. Zircon refractories have
39119. Cermets are
39120. Carbon refractory blocks
39121. __________ is not a single oxiderefractory.
39122. Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.
39123. High alumina refractory compared to fireclay bricks have
39124. Refractory bricks with lower permeability is produced by using
39125. Refractory bricks having lower porosity have
39126. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.
39127. Which is not an acidic refractory ?
39128. Natural silica
39129. Thermal conductivity of refractory bricks
39130. Dolomite bricks have good resistance to attack by
39131. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
39132. Major type of soil found in India
39133. __________ bricks should not be used in oxidising atmosphere.
39134. Indian State tops in production of coffee
39135. Fusion temperature of pure silica (SiO2) is __________ °C.
39136. Which is not a high alumina refractory ?
39137. Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
39138. Faster rate of drying of moulded refractories results in high __________ of refractories.
39139. Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
39140. The highest melting pure oxide (m.p. > 3000°C)is
39141. Refractories used in/for __________ should have low thermal conductivity.
39142. 10 to 30% magnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.
39143. Silica bricks are never used for lining the
39144. Which is not a natural insulating material?
39145. Magnesite refractories are generally not used in the
39146. Which is an acidic refractory ?
39147. Carborundum used for making crucibles for melting non-ferrous metals is chemically
39148. Which of the following impurities reduces the refractoriness of magnesite bricks ?
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