Which one contains maximum percentage of Al2O₃ ? Sillimanite Firebrick Magnesite Aluminous firebrick TRUE ANSWER : ? YOUR ANSWER : ?
Which is the stable form of silica below 870°C ? None of these Tridymite Quartz Cristobalite TRUE ANSWER : ? YOUR ANSWER : ?
Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory None of these Cements Mortars Castables TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following is not a high alumina refractory material? Diaspore Periclase Sillimanite Kyanite TRUE ANSWER : ? YOUR ANSWER : ?
Which brick undergoes maximum shrinkage on drying? Magnesite bricks Chromite bricks Tar bonded dolomite bricks Fireclay bricks TRUE ANSWER : ? YOUR ANSWER : ?
Hot metal runner in blast furnace are lined with __________ bricks. Carborundum Magnesite Fireclay Silica TRUE ANSWER : ? YOUR ANSWER : ?
The largest consumer of refractories is the __________ industry. Cement Fertiliser Metallurgical Power TRUE ANSWER : ? YOUR ANSWER : ?
Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of Crucibles used for melting of high purity metals Insulating bricks Muffles for muffle furnaces Segar cones TRUE ANSWER : ? YOUR ANSWER : ?
Which of the following has the lowest electrical resistivity? Alumina Fireclay Graphite Zircon TRUE ANSWER : ? YOUR ANSWER : ?
A steel member used in the furnace construction to take the thrust of the brickwork is called Buckstay Baffle Armouring Breast wall TRUE ANSWER : ? YOUR ANSWER : ?