Q. Maximum safe working temperature for fireclay bricks is about __________ °C.

View solution

Q. Ferromagnetic ceramic material is not used in the

View solution

Q. Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).

View solution

Q. Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?

View solution

Q. Alumina-graphite bricks are used for lining the

View solution

Q. Spalling resistance of a refractory can not be increased by

View solution

Q. Fireclay refractories have

View solution

Q. Fireclay bricks is not used for lining the

View solution

Q. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.

View solution

Q. Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.

View solution

Q. Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to

View solution

Q. Thermal spalling mainly occurs during __________ of furnaces.

View solution

Q. Which is an acidic refractory ?

View solution

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

View solution

Q. Which of the following impurities reduces the refractoriness of magnesite bricks ?

View solution

Q. Crushing strength of a refractory

View solution

Q. Ramming masses are used for

View solution

Q. Pick out the wrong statement.

View solution

Q. Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.

View solution

Q. Addition of grog in fireclay brick during its manufacture is advantageous, because it results in

View solution