Q. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.

View solution

Q. With increase in the alumina content, the refractoriness of high alumina refractories

View solution

Q. A steel member used in the furnace construction to take the thrust of the brickwork is called

View solution

Q. With increase in the porosity, thermal spalling resistance of fireclay brick

View solution

Q. Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of

View solution

Q. Maximum alumina content in high alumina refractory can be as high as __________ percent.

View solution

Q. Walls, roofs & combustion chambers of annealing furnaces are made of __________ bricks.

View solution

Q. Fireclay bricks are used in the

View solution

Q. Water content in ground refractory material to be shaped into bricks by hand moulding is about __________ percent.

View solution

Q. Chromite refractories

View solution

Q. Firing temperature is minimum (1250-1400 °C) for __________ bricks.

View solution

Q. Resistance to slag attack of a refractory

View solution

Q. Grog

View solution

Q. Test piece for determination of RUL of a refractory is heated in a/an

View solution

Q. Magnesite refractories are used for the construction of those furnaces, which are

View solution

Q. Roof of a basic electric furnace is made of __________ bricks.

View solution

Q. High density refractory bricks have lower

View solution

Q. Silliminite (Al₂O₃.SiO₂) refractory, which is a neutral refractory, is not used in

View solution

Q. Zircon refractories have

View solution

Q. Cermets are

View solution