Refractory Technology — Part 1 MCQs with Explanations

Thoria is the correct answer to “Highest melting (m.p = 3070°C) oxide refractory is”. This question is standard in competitive examination syllabi for Refractory Technology.

Reduced by the addition of basic oxides is the correct answer to “Fusion point of an acidic refractory material is”. This question is standard in competitive examination syllabi for Refractory Technology.

Periclase is the correct answer to “Which of the following is not a high alumina refractory material”. This question is standard in competitive examination syllabi for Refractory Technology.

Steel melting furnace is the correct answer to “Magnesite refractories are generally not used in the”. This question is standard in competitive examination syllabi for Refractory Technology.

Beehive coke ovens is the correct answer to “Silica bricks are never used for lining the”. This question is standard in competitive examination syllabi for Refractory Technology.

65 is the correct answer to “Cold crushing strength of ordinary fireclay brick is about 950 kg/cm 2 . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm 2 .”. This question is standard in competitive examination syllabi for Refractory Technology.

All of the above is the correct answer to “Magnesite chrome bricks are used in the”. This question is standard in competitive examination syllabi for Refractory Technology.

Silica bricks is the correct answer to “Which of the following bricks has the most close values of RUL and PCE”. This question is standard in competitive examination syllabi for Refractory Technology.

RUL is the correct answer to “__________ is the measure of the strength of refractory under the combined effect of temperature & load.”. This question is standard in competitive examination syllabi for Refractory Technology.

Specific gravity is the correct answer to “An indication of degree of firing in silica brick is its”. This question is standard in competitive examination syllabi for Refractory Technology.

All of the above is the correct answer to “Hot face insulating linings of high purity alumina fused mullite are used, where”. This question is standard in competitive examination syllabi for Refractory Technology.

Increases is the correct answer to “With increase in the alumina content in firebricks, its fusion point (refractoriness)”. This question is standard in competitive examination syllabi for Refractory Technology.

Neither A nor B is the correct answer to “Which is required in an insulating refractory”. This question is standard in competitive examination syllabi for Refractory Technology.

Pug is the correct answer to “Mixing of ground refractory material and water is done in a __________ mill.”. This question is standard in competitive examination syllabi for Refractory Technology.

Silica is the correct answer to “Roof of a basic electric furnace is made of __________ bricks.”. This question is standard in competitive examination syllabi for Refractory Technology.

Magnesite is the correct answer to “Which of the following is not a neutral refractory”. This question is standard in competitive examination syllabi for Refractory Technology.

Carbon black is the correct answer to “Which is not an acidic refractory”. This question is standard in competitive examination syllabi for Refractory Technology.

Crucibles used for melting of high purity metals is the correct answer to “Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of”. This question is standard in competitive examination syllabi for Refractory Technology.

Fireclay is the correct answer to “Outer combustion chamber of blast furnace stove is lined with __________ bricks.”. This question is standard in competitive examination syllabi for Refractory Technology.

Fireclay is the correct answer to “Hot metal runner in blast furnace are lined with __________ bricks.”. This question is standard in competitive examination syllabi for Refractory Technology.

Fireclay is the correct answer to “Hot blast main (carrying air at 1000°C) in blast furnace are lined with __________ bricks.”. This question is standard in competitive examination syllabi for Refractory Technology.

Bakelite impregnated or fused periclase is the correct answer to “Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.”. This question is standard in competitive examination syllabi for Refractory Technology.

Silica is the correct answer to “Roof of a basic open hearth furnace is lined with __________ bricks.”. This question is standard in competitive examination syllabi for Refractory Technology.

85% alumina is the correct answer to “Bauxite calcining rotary kilns are lined with __________ bricks.”. This question is standard in competitive examination syllabi for Refractory Technology.

Carborundum is the correct answer to “Lower part of hot metal mixer are lined with __________ bricks.”. This question is standard in competitive examination syllabi for Refractory Technology.

Graphite is the correct answer to “Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).”. This question is standard in competitive examination syllabi for Refractory Technology.

Burning is the correct answer to “Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.”. This question is standard in competitive examination syllabi for Refractory Technology.

Sillimanite is the correct answer to “Which one contains maximum percentage of Al 2 O 3”. This question is standard in competitive examination syllabi for Refractory Technology.

Fireclay bricks is the correct answer to “Which brick undergoes maximum shrinkage on drying”. This question is standard in competitive examination syllabi for Refractory Technology.

Silicon carbide is the correct answer to “__________ is not a single oxiderefractory.”. This question is standard in competitive examination syllabi for Refractory Technology.

Combustion chamber of blast furnace stoves is the correct answer to “Carbon bricks are not used in the lining of the”. This question is standard in competitive examination syllabi for Refractory Technology.

Rate at which a fluid will pass through the pores is the correct answer to “Permeability of bricks is a measure of the”. This question is standard in competitive examination syllabi for Refractory Technology.

Silicon carbide is the correct answer to “Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of”. This question is standard in competitive examination syllabi for Refractory Technology.

All of the above is the correct answer to “Cold crushing strength of refractories depends upon its”. This question is standard in competitive examination syllabi for Refractory Technology.

Resistance to slag attack is the correct answer to “Addition of zircon to silica refractory brick improves its”. This question is standard in competitive examination syllabi for Refractory Technology.

Slip casting is the correct answer to “Hollow refractory bricks are made by”. This question is standard in competitive examination syllabi for Refractory Technology.

Resistance to abrasion is the correct answer to “Which property of refractories is the most important for top section of the blast furnace”. This question is standard in competitive examination syllabi for Refractory Technology.

Water is the correct answer to “Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material”. This question is standard in competitive examination syllabi for Refractory Technology.

Magnesia bricks is the correct answer to “Which of the following is not an acidic refractory”. This question is standard in competitive examination syllabi for Refractory Technology.

1710 is the correct answer to “Refractoriness of a typical silica brick corresponds to Segar cone number, '32', which is equivalent to a temperature of __________ °C.”. This question is standard in competitive examination syllabi for Refractory Technology.