Related Questions

Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
A Furnace employing neutral atmosphere
B Carbon resistance furnace
C Reducing atmosphere
D Furnace employing negative pressure
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.
A Fireclay
B Silica
C Dolomite
D Very low alumina
Test piece for determination of RUL of a refractory is heated in a/an
A Oxidising atmosphere
B Reducing atmosphere
C Electric furnace
D Neutral atmosphere
Which of the following bricks has the most close values of RUL and PCE?
A Silica bricks
B Fireclay bricks
C High alumina bricks
D Tar dolomite bricks
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
Which of the following impurities reduces the refractoriness of magnesite bricks?
A Al2O3
B CaO
C SiO2
D All of the above
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

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