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Chemical Engineering
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Refractory Technology
Comments
Question
__________ bricks are used in the burning zone of a cement rotary kiln.
Options
A. High alumina
B. Fireclay
C. Thoria
D. Silicon carbide
Correct Answer
High alumina
Refractory Technology problems
Search Results
1. Bauxite calcining rotary kilns are lined with __________ bricks.
Options
A. fireclay
B. carbon
C. 85% alumina
D. corundum
Show Answer
Scratch Pad
Discuss
Correct Answer: 85% alumina
2. Carbon refractories
Options
A. do not burn/oxidise, when exposed to air on heating.
B. are not attacked by slags, as they are not wetted by melts.
C. do not resist temperature fluctuations.
D. have extremely low thermal & electrical conductivities.
Show Answer
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Discuss
Correct Answer: are not attacked by slags, as they are not wetted by melts.
3. Which brick undergoes maximum shrinkage on drying?
Options
A. Tar bonded dolomite bricks
B. Fireclay bricks
C. Magnesite bricks
D. Chromite bricks
Show Answer
Scratch Pad
Discuss
Correct Answer: Fireclay bricks
4. Refractory castables are used for
Options
A. producing monolithic linings.
B. patch work.
C. minimising the number of joints in the structure.
D. all (a), (b) and (c).
Show Answer
Scratch Pad
Discuss
Correct Answer: all (a), (b) and (c).
5. 'Spinel', a refractory mineral is chemically represented as
Options
A. M
g
Al
2
O
4
B. M
g
Al
2
O
3
C. M
g
SO
4
D. M
g
Al
2
O
3
.2H
2
O
Show Answer
Scratch Pad
Discuss
Correct Answer: M
g
Al
2
O
4
6. Magnesite refractories have low resistance to
Options
A. attack by basic slag.
B. abrasion.
C. disintegration on sudden change of temperature.
D. both (b) and (c).
Show Answer
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Discuss
Correct Answer: both (b) and (c).
7. Hot face insulating linings of high purity alumina fused mullite are used, where
Options
A. very high temperatures are involved.
B. highly reducing conditions are involved.
C. presence of iron or silica is harmful.
D. all (a), (b) and (c).
Show Answer
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Discuss
Correct Answer: all (a), (b) and (c).
8. Mixing of ground refractory material and water is done in a __________ mill.
Options
A. pug
B. ball
C. tube
D. rod
Show Answer
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Discuss
Correct Answer: pug
9. Which of the following bricks should not be used, if the furnace is to be used intermit-tantly?
Options
A. Firebricks
B. Silica bricks
C. Silicon carbide bricks
D. Sillimanite
Show Answer
Scratch Pad
Discuss
Correct Answer: Silica bricks
10. The largest consumer of refractories is the __________ industry.
Options
A. cement
B. metallurgical
C. fertiliser
D. power
Show Answer
Scratch Pad
Discuss
Correct Answer: metallurgical
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