Porosity of fireclay refractories is _______________ percent?
Porosity of fireclay refractories is _______________ percent?
A. 5-10
B. 10-25
C. 25-35
D. 35-50
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Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?
Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?A. Less shrinkage in heating, decreased apparent porosity & increased specific gravity
B. High strength & thermal spalling resistance
C. Less addition of water to get a workable plasticity & lesser time required for drying the raw
refractories and hence increased rate of production
D. All A., B. and C.Conversion of silica mineral to Cristobalite is accompanied by reduction in its ____________________?
Conversion of silica mineral to Cristobalite is accompanied by reduction in its ____________________?A. Volume
B. Specific gravity
C. Both A. & B.
D. Neither A. nor B.Which of the following bricks should not be used, if the furnace is to be used intermittently ?
Which of the following bricks should not be used, if the furnace is to be used intermittently ?A. Firebricks
B. Silica bricks
C. Silicon carbide bricks
D. SillimaniteFurnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be __________________?
Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be __________________?A. Oxidising
B. Neutral
C. Either A. or B.
D. Neither A. nor B.High density refractory bricks have lower__________________?
High density refractory bricks have lower__________________?A. Spalling resistance
B. Thermal conductivity
C. Fusion point
D. Slag penetration resistanceCold crushing strength of a refractory does not depend upon its ____________________?
Cold crushing strength of a refractory does not depend upon its ____________________?A. Shape
B. Composition
C. Firing temperature
D. Texture