Explore topic-wise MCQs in Engineering.

The largest consumer of refractories is the __________ industry.

Use of higher percentage of lime for bonding silica bricks, reduces their

Graphite or carbon refractories

__________ bricks are used in the burning zone of a cement rotary kiln.

Furnace atmosphere for softening temperature determination of refractories (in which segar cones are placed) should be

Chrome magnesite brick is not used for lining the

Roof of a basic open hearth furnace is lined with __________ bricks.

High alumina refractories are used in the

Highest melting (m.p = 3070 C) oxide refractory is

Which one contains minimum percentage of SiO₂?

Porosity of silica bricks varies from __________ percent.

Rate of slag attack on refractories increases with rise in temperature due to the

Semi-silica bricks compared to silica bricks have

Magnesite refractories have low resistance to

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

Magnesite chrome bricks are used in the

Carbon bricks are not used in the lining of the

Maximum apparent porosity of magnesite bricks is about __________ percent.

Dilatometer is used for the determination of __________ of refractories.

With decrease in porosity, the __________ of the refractories decreases.

Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves ?

The maximum linear expansion of silica bricks during firing is about __________ percent.

SiO₂ percentage in firebrick is about

Porosity is induced in insulating refractories by adding

Magnesite bricks have poor resistance to attack by __________ slag.

Carbon refractories

Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.

Porosity of fireclay refractories is __________ percent.

To resist spalling tendency, a refractory should have

Cold crushing strength of fireclay bricks is about __________ kgf/cm².

Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm² ) is __________ C.

Dolomite bricks have good resistance to attack by

__________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.

The highest melting pure oxide (m.p. > 3000 C)is

__________ bricks should not be used in oxidising atmosphere.

Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.

Which is not a high alumina refractory ?

Pure oxide refractories are generally monocrystaliine in nature and are self bonded __________ bricks are generally used as moderator in nuclear reactors.

Faster rate of drying of moulded refractories results in high __________ of refractories.

Which is an acidic refractory ?

Carborundum used for making crucibles for melting non-ferrous metals is chemically

An ideal refractory should have high

Ganister is a source of the

Which brick undergoes maximum shrinkage on drying ?

Which is the stable form of silica upto 1470 C ?

Hot face insulating linings of high purity alumina fused mullite are used, where

__________ is not a single oxiderefractory.

Refractory bricks having lower porosity have

Hot blast main (carrying air at 1000 C) in blast furnace are lined with __________ bricks.

High alumina refractory compared to fireclay bricks have