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MCQs 1: With decrease in porosity, the ______________ of the refractories decreases?

Strength Thermal conductivity Spalling resistance None of these
Answer Explanation

MCQs 2: ______________ bricks should not be used in oxidising atmosphere?

Tar dolomite Carbon Silica Fireclay
Answer Explanation

MCQs 3: Magnesite bricks have poor resistance to attack by _____________ slag?

Lime Basic Acid None of these
Answer Explanation

MCQs 4: Which is not a natural insulating material ?

Diatomaceous earth/kieselgur Asbestos Vermiculite None of these
Answer Explanation

MCQs 5: Which of the following is not a high alumina refractory material ?

Kyanite Sillimanite Diaspore Periclase
Answer Explanation

MCQs 6: ___________________ is the measure of the strength of refractory under the combined effect of temperature & load ?

Porosity RUL Specific gravity Thermal conductivity
Answer Explanation

MCQs 7: Which one contains minimum percentage of SiO2 ?

Firebrick Sillimanite Semi-silica Aluminous firebrick
Answer Explanation

MCQs 8: Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as _____________ percent?

55 70 80 90
Answer Explanation

MCQs 9: Mullite is chemically represented by_________________?

Al2O3. 2SiO2 3Al2O3. 2SiO2 Al2O3. SiO2 2Al2O3. 3SiO2
Answer Explanation

MCQs 10: High alumina refractory compared to fireclay bricks have____________________?

Less load bearing capacity Less resistance to slag attack Low refractoriness High resistance to thermal shock and creep
Answer Explanation

MCQs 11: Porosity of fireclay refractories is _______________ percent?

5-10 10-25 25-35 35-50
Answer Explanation

MCQs 12: Fusion temperature of pure silica (SiO2) is _______________ °C?

1350 1715 2570 2800
Answer Explanation

MCQs 13: Bottom of basic open hearth furnace are constructed of__________________?

Dead burnt magnesite ramming mass Porous fireclay bricks Semi-silica bricks Silicon carbide bricks
Answer Explanation

MCQs 14: Addition of zircon to silica refractory brick improves its_____________________?

Crushing strength Resistance to slag attack Both A. and B. Neither A. nor B.
Answer Explanation

MCQs 15: Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to__________________?

Thermal spalling Slag attack Fusion under load CO attack
Answer Explanation

MCQs 16: Refractory bricks with lower permeability is produced by using __________________?

Higher firing temperature Higher moulding pressure Finer grog size All A., B. and C.
Answer Explanation

MCQs 17: Pure oxide refractories are generally monocrystalline in nature and are self bonded _______________ bricks are generally used as moderator in nuclear reactors?

Beryllia Carborundum Corundum Thoria
Answer Explanation

MCQs 18: Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?

Fireclay Silicon carbide Corundum Siliceous fireclay
Answer Explanation

MCQs 19: Refractory bricks having lower porosity have_________________________?

High insulating properties Low heat capacity Low thermal conductivity Greater strength
Answer Explanation

MCQs 20: Silica bricks are never used for lining the____________________?

Beehive coke ovens By-product coke ovens Dome of blast furnace stoves Roof of open hearth furnace
Answer Explanation

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