To resist spalling tendency, a refractory should have

Mullite is chemically represented by

Which of the following bricks should not be used, if the furnace is to be used intermit-tantly ?

Porosity of silica bricks varies from __________ percent.

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

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

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

Sillimanite is a __________ refractory.

Refractory castables are used for

Colour of fireclay bricks is

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

Carbon bricks are not used in the lining of the

Porosity of fireclay refractories is __________ percent.

Spalling tendency of refractories is reduced by increasing its

Carbon refractories are exclusively used in the

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

High refractorinness of refractory bricks means, that it has a

Conversion of silica mineral to cristobalite is accompanied by reduction in its

The largest consumer of refractories is the __________ industry.

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