Chemical Engineering MCQs

6108 MCQs (Page 362 of 611)

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Fusion temperature of pure silica (SiO2) is _______________ °C?

A. 1350
B. 1715
C. 2570
D. 2800

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Bottom of basic open hearth furnace are constructed of__________________?

A. Dead burnt magnesite ramming mass
B. Porous fireclay bricks
C. Semi-silica bricks
D. Silicon carbide bricks

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Addition of zircon to silica refractory brick improves its_____________________?

A. Crushing strength
B. Resistance to slag attack
C. Both a. and b.
D. Neither a. nor b.

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Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to__________________?

A. Thermal spalling
B. Slag attack
C. Fusion under load
D. Co attack

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Refractory bricks with lower permeability is produced by using __________________?

A. Higher firing temperature
B. Higher moulding pressure
C. Finer grog size
D. All a., b. and c.

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Pure oxide refractories are generally monocrystalline in nature and are self bonded _______________ bricks are generally used as moderator in nuclear reactors?

A. Beryllia
B. Carborundum
C. Corundum
D. Thoria

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Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of________________?

A. Fireclay
B. Silicon carbide
C. Corundum
D. Siliceous fireclay

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Refractory bricks having lower porosity have_________________________?

A. High insulating properties
B. Low heat capacity
C. Low thermal conductivity
D. Greater strength

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Silica bricks are never used for lining the____________________?

A. Beehive coke ovens
B. By-product coke ovens
C. Dome of blast furnace stoves
D. Roof of open hearth furnace

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Fireclay refractories____________________?

A. Are not resistant to the action of basic slags
B. Combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming
FusIble aluminates silicates etc
C. Shrink during firing

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