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MCQs 1: High refractoriness of refractory bricks means, that it has a________________?

High spalling resistance Low spalling resistance High resistance to fusion Low porosity
Answer Explanation

MCQs 2: To resist spalling tendency, a refractory should have________________?

Greater diffusivity Low specific heat Low thermal co-efficient of expansion All A., B. and C.
Answer Explanation

MCQs 3: Cermets are____________________?

Composite material containing both ceramic & metallic constituents Having high strength & resistance to high temperature Used in space vehicles, missiles & nuclear energy plants All A., B. and C.
Answer Explanation

MCQs 4: Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory_________________?

Mortars Cements Castables None of these
Answer Explanation

MCQs 5: Hot face insulating linings of high purity alumina fused mullite are used, where_________________?

Very high temperatures are involved Highly reducing conditions are involved Presence of iron or silica is harmful All A., B. and C.
Answer Explanation

MCQs 6: Periclase refractory contains mainly________________?

CaO MgO Al2O3 SiO2
Answer Explanation

MCQs 7: Silica bricks have low spalling resistance below 600°C, due to its________________?

Very high thermal conductivity High co-efficient of expansion upto this temperature High thermal diffusivity Low refractoriness
Answer Explanation

MCQs 8: Magnesite refractories have low resistance to___________________?

Attack by basic slag Abrasion Disintegration on sudden change of temperature Both B. and C.
Answer Explanation

MCQs 9: Which is a basic refractory ?

Fireclay Silica Chrome magnesite None of these
Answer Explanation

MCQs 10: Tar dolomite bricks are used in the_________________?

Basic Bessemer converter Basic open hearth furnace Electric furnaces All A., B. and C.
Answer Explanation

MCQs 11: Cold crushing strength of fireclay bricks is about ______________ kgf/cm2?

50-100 100-150 200-400 500-1000
Answer Explanation

MCQs 12: Sillimanite (Al2O3.SiO2) refractory, which is a neutral refractory, is not used in________________?

Pottery furnace Glass melting furnace Crucibles Gas retorts
Answer Explanation

MCQs 13: Rate of slag attack on refractories increases with rise in temperature due to the___________________?

Decreased viscosity of slag Increased thermal conductivity of brick Oxidising condition in the furnace None of these
Answer Explanation

MCQs 14: Tar bonded dolomite bricks__________________?

Are stored under controlled temperature & humidity to avoid hydration Are used in outer lining of L.D. converters Have poorer hydration resistance than pitch bonded bricks All A., B. and C.
Answer Explanation

MCQs 15: Which furnace consumes maximum refractory annually in an integrated steel plant ?

Soaking pit Blast furnace L.D. converter Coke ovens
Answer Explanation

MCQs 16: Which of the following bricks should not be used, if the furnace is to be used intermittently ?

Firebricks Silica bricks Silicon carbide bricks Sillimanite
Answer Explanation

MCQs 17: Refractoriness under load (RUL) is the most important property for the refractory bricks_________________?

At the hearth bottom of the furnace on which stock is placed Used for furnace insulation Used in the roof of the furnace None of these
Answer Explanation

MCQs 18: Ganister is a source of the ________________?

Silica Periclase Lime None of these
Answer Explanation

MCQs 19: Which is required in an insulating refractory ?

High thermal conductivity Low porosity Both A. and B. Neither A. nor B.
Answer Explanation

MCQs 20: Sillimanite is a _____________ refractory?

Basic Neutral High alumina Insulating
Answer Explanation

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