Electrical resistor bars are made of
Which is a basic refractory ?
With increasing alumina content, the fusion point of high alumina refractories
Chrome magnesite bricks are used in the
High thermal conductivity of a refractory material is not important, when it is to be used in the
Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of
tomagnesite is added to chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the __________ of chromite.
Silica bricks are never used for lining the
Pick out the wrong statement.
Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.
Carbon refractory blocks
Which is not an alumino-silicate refractory?
Cold crushing strength of a refractory does not depend upon its
Which is an acidic refractory ?
Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm2.
Maximum safe working temperature for fireclay bricks is about __________ °C.
__________ is the measure of the strength of refractory under the combined effect of temperature & load.
Which is not a natural insulating material?
__________ bricks should not be used in oxidising atmosphere.
Faster rate of drying of moulded refractories results in high __________ of refractories.
Periclase refractory contains mainly
Refractoriness under load (RUL) is the most important property for the refractory bricks
Carborundum used for making crucibles for melting non-ferrous metals is chemically
Ferromagnetic ceramic material is not used in the
Fireclay bricks are not used in the
Magnesite refractories are generally not used in the
Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
The highest melting pure oxide (m.p. > 3000°C)is
Which of the following impurities reduces the refractoriness of magnesite bricks ?
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