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The most commonly used binder for refractory concrete is
calcium aluminate cement
cements
silicates
all of the above
A combination of refractory grain and suitable bonding agent that, after the addition of a proper liquid, is generally poured into place to form a refractory shape or structure which becomes rigid because of chemical action is called
mortar
castable
ceramic modules
all of the above
Compositions of ground refractory materials develop a strong bond at air ambient temperatures by virtue of chemical reactions within the binder phase that is usually activated by water additions. These refractories include cement and phosphate bonded castables is called:
Air setting refractories
Heat setting refractories
Air and heat setting refractory
None of the above
Compositions of ground refractory materials which require relatively high temperatures for the development of an adequate bond (commonly called the ceramic bond) is called
air setting refractories
heat setting refractories
air and heat setting refractories
none of the above
Alumina C silica refractories containing 45% or more alumina, materials used in their production include diaspore, bauxite, gibbsite, kyanite, sillimanite, alusite, and fused alumina (artificial corundum) is called
fire clay refractory
insulating refractories
high alumina refractories
all of the above
A high alumina mineral usually consists of rounded concretionary grains embedded in clay-like mass and is believed to consist essentially of alumina trihydrate (Al2O3 H2O) and alumina hydrate (Al2O3 H2O) in varying proportions is called
kyanite
bauxite
fused alumina
alusite
Commercially on calcined basis bauxite must contain at least
65% fused silica
60% alumina
65% alumina
None of the above
A natural or synthetic mineral theoretically consisting solely of alumina (Al2O3), specific gravity 4.00 C 4.02, melting point 3720?
F. (2050? C) Hardness 8.8 is called
Corundum
Kaolin
Mica
None of the above
The selected compression test section of the specimen for the CCs test shall be free from
cCracks
Chipped surfaces
Other obvious defects
All of the above
The test specimen of castable refractory for cold crushing strength shall be
2 in. (51mm) cubes
Cylinders, 2 in. (51mm)in dia. by 2 in.(51 mm) height
a or b
none of the above
In API RP 936, the referenced ASTM standard procedure for cold crushing strength and modulus of rupture is
A. C 133 C 97 B. C704 C 01 C. C181 C 91
D. None of the above
Refractories whose major constituent is lime, magnesia, or both and which may react chemically with acid refractories, acid slags, or acid fluxes at a high temperature is known as
Acid refractories
Basic refractories
Natural refractories
None f the above
Refractories containing a substantial amount of silica which is reactive with basic refractories, basic slags, or basic fluxes at high temperatures are known as
Acid refractories
Basic refractories
Natural refecatories
None of the above
Cristobalite is an important constituent of
Alumina bricks
Silica brick
Magnesia brick
Insulating brick
A group of impure magnesium silicate minerals that occur in a fiberous form is known as
Asbestos
Mineral fibre
Fused silica
None of the above
A group of rock minerals having nearly perfect cleavage in one direction and consisting of thin elastic plates and the most common varieties are muscovite and biotite is called
Corundum
Kaolin
Mica
None of the above