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 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
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
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
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 loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.
A Fireclay
B Silica
C Dolomite
D Very low alumina
RUL of refractories depends on the
A Chemical composition
B Physical structure
C Presence of impurities like iron & alkali
D All of the above
A standard test for determination of hardness in water is termed as __________ test.
A EDTA
B Electometric
C Total count
D Presumptive
A board of length L feet is cut into two pieces such that the length of one piece is 1 foot more than twice the length of the other piece. Which of the following is the length, in feet, of the longer piece?
A (2L+1)/2
B (L-1)/3
C (2L+3)/3
D (2L+1)/3

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