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
If a refractory contains high content of silicon, it means refractory is
A Acidic
B Basic
C Neutral
D Brittle
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
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
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
High refractorinness of refractory bricks means, that it has a
A High spalling resistance
B Low spalling resistance
C High resistance to fusion
D Low porosity
Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory
A Mortars
B Cements
C Castables
D None of these
Refractory bricks having lower porosity have
A High insulating properties
B Low heat capacity
C Low thermal conductivity
D Greater strength

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