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Chemical Engineering - Refractory Technology

Exercise : Refractory Technology - Section 3
36.
Pick out the wrong statement.
A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscous state is termed s glass.
Ceramic materials do not undergo vitrification on heating.
Ceramic materials are brittle in nature.
Non-oxide ceramic materials generally act as a semi-conductor.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
Lower wall courses of soaking pits are made of __________ bricks to avoid the action of molten slag & scale.
chrome or magnesite
silicon carbide
silica
lowduty fireclay
Answer: Option
Explanation:
No answer description is available. Let's discuss.
38.
Addition of grog in fireclay brick during its manufacture is advantageous, because it results in
less shrinkage in heating, decreased apparent porosity & increased specific gravity.
high strength & thermal spalling resistance.
less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production.
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with __________ bricks.
bakelite impregnated or fused periclase
silica
semi-silica
fireclay
Answer: Option
Explanation:
No answer description is available. Let's discuss.
40.
Fireclay refractories
are not resistant to the action of basic slags.
combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc.
shrink during firing
all (a), (b) and (c)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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