Refractory Technology MCQs

212 MCQs  — Chemical Engineering MCQs  (Page 20 of 22)

Attempt Refractory Technology Quiz
Porosity of fireclay refractories is _______________ percent?
A. 5-10
B. 10-25
C. 25-35
D. 35-50
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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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Word of the Day
22 Jul
Combative
ready or eager to fight or argue.
لڑاکا، متنازع، جھگڑالو

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