Related Questions

An insulating refractory brick should have high porosity and low thermal conductivity. Which of the following is not used for inducing porosity in the insulating refractory bricks during its manufacture?
A Cork
B Saw dust
C Sand
D Chemically prepared foam
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 have poor resistance to attack by __________ slag.
A Lime
B Basic
C Acid
D None of these
Firing temperature of magnesite bricks is about __________ °C.
A 800-1000
B 1000-1200
C 1600-1800
D 2400-2600
Porosity of silica bricks varies from __________ percent.
A 5 to 10
B 20 to 30
C 45 to 60
D 60 to 75
Magnesite chrome bricks are used in the
A Roof lining of basic open hearth & other basic furnaces
B Reheating furnaces
C Soaking pits
D All of the above
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
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

Next steps