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

Q. Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.

View solution

Q. Fireclay refractories

View solution

Q. Which is not a high alumina refractory ?

View solution

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

View solution

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

View solution

Q. Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.

View solution

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

View solution

Q. In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.

View solution

Q. Which is not an acidic refractory ?

View solution