Related Questions

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
Refractoriness under load (RUL) is the most important property for the refractory bricks
A At the hearth bottom of the furnace on which stock is placed
B Used for furnace insulation
C Used in the roof of the furnace
D None of these
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/fusion points of 'superduty' refractories is __________ °C.
A 1520-1630
B 1630-1670
C > 1730
D > 2000
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
With increase in the alumina content in firebricks, its fusion point (refractoriness)
A Decreases linearly
B Remains unchanged
C Increases
D Decreases
Which of the following impurities reduces the refractoriness of magnesite bricks?
A Al2O3
B CaO
C SiO2
D All of the above
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
RUL of refractories depends on the
A Chemical composition
B Physical structure
C Presence of impurities like iron & alkali
D All of the above

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