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
High porosity refractory bricks have
A Poor resistance to the peneration of molten slag, metal & flue gases
B Poor heat conductivity & low strength
C Better thermal spalling resistance
D All of the above
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
Refractory bricks with lower permeability is produced by using
A Higher firing temperature
B Higher moulding pressure
C Finer grog size
D All of the above
Refractory bricks having high thermal conductivity is desirable, when it is to be used in the
A L.D. converter
B Blast furnace
C Rotary kiln
D Recuperator
Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
A Mortars
B Cements
C Castables
D None of these
If a refractory contains high content of silicon, it means refractory is
A Acidic
B Basic
C Neutral
D Brittle
Refractory bricks burnt at very high temperature have got
A Greater resistance to corrosion by slags
B Less resistance to corrosion by slags
C High spalling tendency
D None of these
High alumina refractory compared to fireclay bricks have
A Less load bearing capacity
B Less resistance to slag attack
C Low refractoriness
D High resistance to thermal shock and creep

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