39052. Refractoriness/fusion points of 'superduty' refractories is __________ °C.
39053. Outer combustion chamber of blast furnace stove is lined with __________ bricks.
39054. Presence of MgO in alumino-silicate refractories __________ its refractoriness.
39055. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.
39056. Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks.
39057. Fireclay bricks are used in the
39058. Water content in ground refractory material to be shaped into bricks by hand moulding is about __________ percent.
39059. Chromite refractories
39060. Firing temperature is minimum (1250-1400 °C) for __________ bricks.
39061. With increase in the alumina content, the refractoriness of high alumina refractories
39062. A steel member used in the furnace construction to take the thrust of the brickwork is called
39063. With increase in the porosity, thermal spalling resistance of fireclay brick
39064. Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of
39065. Maximum alumina content in high alumina refractory can be as high as __________ percent.
39066. Refractories are dried in the
39067. Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the
39068. Hot metal runner in blast furnace are lined with __________ bricks.
39069. Spray test determines the __________ of refractories.
39070. The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ≤ 0.5 percent.
39071. Fusion point of an acidic refractory material is
39072. Which is required in an insulating refractory ?
39073. 'Super refractories' are made from pure
39074. Chromite refractories are
39075. Which is the most stable crystalline form of silica at room temperature ?
39076. Silica refractories
39077. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
39078. Which of the following is not an acidic refractory ?
39079. Insulating refractories should have
39080. Cold crushing strength of refractories depends upon its
39081. Tar bonded dolomite bricks
39082. Electrical resistor bars are made of
39083. Which is not an alumino-silicate refractory?
39084. Periclase refractory contains mainly
39085. Si percentage in silica refractories used in the walls of coke oven is about
39086. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
39087. High thermal conductivity of a refractory material is not important, when it is to be used in the
39088. Maximum safe working temperature for fireclay bricks is about __________ °C.
39089. Ferromagnetic ceramic material is not used in the
39090. Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.
39091. Fireclay bricks are never used in the
39092. With increasing alumina content, the fusion point of high alumina refractories
39093. Chrome magnesite bricks are used in the
39094. Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.
39095. Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
39096. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?
39097. Alumina-graphite bricks are used for lining the
39098. Spalling resistance of a refractory can not be increased by
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