B. Silica

C. Direct bonded basic

D. Magnesite

A. Obtaining monolithic working faces

B. Repairing construction of various furnace parts

D. Neither A. nor B.

A. None of these

B. Quartz

C. Cristobalite

A. Wetting characteristics

B. Refractoriness

C. Thermal conductivity

A. Slide gate in teeming laddies

B. Continuous casting systems

D. Neither A. nor B.

A. 1450

C. 1150

D. 1300

A. Zirconia

B. Beryllia

D. Alumina

A. Carborundum

B. Mullite

D. Silica

A. Carborundum

B. Thoria

C. Beryllia

A. Presence of iron or silica is harmful

B. Very high temperatures are involved

D. Highly reducing conditions are involved

A. Yellow

B. Black

D. None of these

A. 70

C. 30

D. 50

A. Better thermal spalling resistance

B. Poor resistance to the penetration of molten slag, metal & flue gases

C. Poor heat conductivity & low strength

A. Magnesia

C. None of these

D. Zirconia

B. 1670

C. 1630

D. 1520

A. Are not at all resistant to the corrosive action of iron oxide

B. Have very low (50 kg/cm2) cold crushing strength (C.C.S.), and cannot be used in metalcase

D. Have very low thermal co-efficient of expansion

E. m

A. High spalling resistance

B. Low spalling resistance

D. Low porosity

A. None of these

C. Quartz

D. Tridymite

A. Silicon carbide bricks

B. Sillimanite

C. Firebricks

B. Does not affect

C. Increases

D. Either A. or B.; depends on its quantity

A. Segar cones

B. Muffles for muffle furnaces

C. Insulating bricks

A. None of these

B. Superduty fireclay

D. Chromite

A. Mullite bricks

C. Fireclay bricks

D. Magnesite bricks

A. Less fusion point

B. Better spalling resistance

D. Neither A. not B.

A. Cristobalite

B. None of these

C. Tridymite

A. Have poorer hydration resistance than pitch bonded bricks

C. Are used in outer lining of L.D. converters

D. Are stored under controlled temperature & humidity to avoid hydration

B. Spalling rate

C. None of these

D. Shrinkage ability

A. Do not resist temperature fluctuations

B. Have extremely low thermal & electrical conductivities

D. Do not burn/oxidise, when exposed to air on heating

A. Inner lining of L.D. converter

C. Aluminium melting furnaces

D. All A., and B. and C.

A. Coke oven regenerators

B. Muffle furnace

C. Recuperators

B. Corundum

C. Fireclay

D. Carbon

A. Strength

C. Specific gravity

D. Thermal conductivity

B. Decreases linearly

C. Remains unchanged

D. Decreases

A. Very high thermal conductivity

C. High thermal diffusivity

D. Low refractoriness

A. Decreases

B. Remain same

D. May increase or decrease

A. Resistance to slag attack

B. Spalling resistance

D. Electrical conductivity

B. Firing temperature

C. Composition

D. Texture

B. 40

C. 20

D. 80

B. Zircon

C. Fireclay

D. Alumina

B. Soaking pits

C. Reheating furnaces

D. Roof lining of basic open hearth & other basic furnaces

A. Patch work

C. Producing monolithic linings

D. Minimising the number of joints in the structure

A. Insulation of high temperature furnaces

B. Hearth of the blast furnace

D. Roof of electric furnaces

A. 1630

C. 1670

D. 1520

A. Fireclay

B. Thoria

C. Silicon carbide

B. None of these

C. Iron oxide

D. Lime slag

A. Basic open hearth furnace

B. Basic Bessemer converter

C. Electric furnaces

B. 7-May

C. 3-Feb

D. 12-Jul

B. Corundum

C. Silica

D. Magnesite

A. Segar cones

C. Orton cones

D. Ovens & retorts

A. Silica

B. Semi-silica

C. Fireclay