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Chemical Engineering
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Refractory Technology
Comments
Question
Refractories used in/for __________ should have low thermal conductivity.
Options
A. coke ovens
B. insulation
C. regenerators
D. muffle furnaces
Correct Answer
insulation
Refractory Technology problems
Search Results
1. Bottom of basic open hearth furnace are constructed of
Options
A. dead burnt magnesite ramming mass.
B. porous fireclay bricks.
C. semi-silica bricks.
D. silicon carbide bricks.
Show Answer
Scratch Pad
Discuss
Correct Answer: dead burnt magnesite ramming mass.
2. Natural silica
Options
A. mainly contains quartz.
B. is not stable at high temperature.
C. transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes.
D. all (a), (b) and (c).
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c).
3. The highest melting pure oxide (m.p. > 3000°C)is
Options
A. thoria
B. alumina
C. beryllia
D. zirconia
Show Answer
Scratch Pad
Discuss
Correct Answer: thoria
4. __________ is not a single oxiderefractory.
Options
A. Zirconia
B. Silicon carbide
C. Magnesia
D. None of these
Show Answer
Scratch Pad
Discuss
Correct Answer: Silicon carbide
5. Fusion temperature of pure silica (SiO
2
) is __________ °C.
Options
A. 1350
B. 1715
C. 2570
D. 2800
Show Answer
Scratch Pad
Discuss
Correct Answer: 1715
6. Magnesite refractories are generally not used in the
Options
A. electric furnace walls.
B. steel melting furnace.
C. open hearth furnace.
D. burning zone of cement kilns.
Show Answer
Scratch Pad
Discuss
Correct Answer: steel melting furnace.
7. Carborundum used for making crucibles for melting non-ferrous metals is chemically
Options
A. silicon carbide
B. silicon nitride
C. crystalline magnesia
D. zirconium sulphate
Show Answer
Scratch Pad
Discuss
Correct Answer: silicon carbide
8. Refractories subjected to alternate cycles of heating & cooling are liable to loose their resistance to
Options
A. thermal spalling
B. slag attack
C. fusion under load
D. CO attack
Show Answer
Scratch Pad
Discuss
Correct Answer: thermal spalling
9. Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
Options
A. 80 and 20
B. 20 and 80
C. 50 and 50
D. 60 and 40
Show Answer
Scratch Pad
Discuss
Correct Answer: 80 and 20
10. Refractory bricks with lower permeability is produced by using
Options
A. higher firing temperature.
B. higher moulding pressure.
C. finer grog size.
D. all (a), (b) and (c).
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c).
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