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Chrome magnesite bricks are used in the
A Side walls of soaking pits and arc furnaces
B Copper melting furnaces & converters
C Burner block of glass tanks
D All of the above
Chrome magnesite bricks are
A Acidic in nature
B Neutral in nature
C Having higher RUL than silica bricks
D Made by mixing 30% chromite and 70% periclase
Chrome magnesite is not used in the
A Inner lining of L.D. converter
B Aluminium melting furnaces
C Wear out lining of steel melting furnaces
D All of the above
Chrome magnesite brick is not used for lining the
A Hearth of soaking pits
B Bottom hearth of reheating furnace
C Coke oven regenerator
D Burning zone of limestone rotary kilns
Rotary kilns meant for calcination of limestone are lined with chrome magnesite in __________ zone.
A Preheating
B Cooling
C Burning
D All of the above
Magnesite chrome refractories
A Have better spalling resistance than chrome magnesite refractories
B Have very low thermal co-efficient of expansion
C Are not at all resistant to the corrosive action of iron oxide
D Have very low (50 kg/cm2) cold crushing strength (C.C.S.) and can not be used in metalcase form
A red house is built from red bricks . A blue house is built from blue bricks. A white house is built from white bricks. Then what is a greenhouse made from ?
A green bricks
B wood
C glass
D steel
The solid brick shown is made of small square shaped bricks of side 1. when the large brick is disassembled into its component small bricks. the total surface area of all the small bricks is how much greater than the surface area of the large brick?
A 32
B 40
C 60
D 72
Magnesite bricks are used in those parts of furnaces, which are
A Subjected to temperature fluctuation
B Required to resist corrosive basic slag
C Subjected to high load
D None of these
Which of the following impurities reduces the refractoriness of magnesite bricks?
A Al2O3
B CaO
C SiO2
D All of the above

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