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Chemical Engineering
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Refractory Technology
Comments
Question
Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.
Options
A. 2-3
B. 5-7
C. 7-12
D. 14-20
Correct Answer
14-20
Refractory Technology problems
Search Results
1. Which one contains maximum percentage of Al
2
O
3
?
Options
A. Firebrick
B. Sillimanite
C. Magnesite
D. Aluminous firebrick
Show Answer
Scratch Pad
Discuss
Correct Answer: Sillimanite
2. PCE value (Segar cone) of superduty refractories is more than 33, which is equivalent to a temperature of __________ °C.
Options
A. 1520
B. 1630
C. 1670
D. 1730
Show Answer
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Discuss
Correct Answer: 1730
3. Cold crushing strength of a refractory does not depend upon its
Options
A. shape
B. composition
C. firing temperature
D. texture
Show Answer
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Discuss
Correct Answer: shape
4. Insulating refractories should have
Options
A. high porosity
B. low thermal conductivity
C. both (a) and (b)
D. neither (a) not (b)
Show Answer
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Discuss
Correct Answer: low thermal conductivity
5. Ferromagnetic ceramic material is not used in the
Options
A. thermal insulation
B. transformers
C. magnetic switches
D. television sets
Show Answer
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Discuss
Correct Answer: thermal insulation
6. High thermal conductivity of a refractory material is not important, when it is to be used in the
Options
A. coke oven regenarators
B. muffle furnace
C. blast furnace
D. recuperators
Show Answer
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Discuss
Correct Answer: blast furnace
7. Silica bricks are attacked by basic slags at high temperature. Which of the following is not used solely as a binding material?
Options
A. aluminium phosphate
B. water
C. lime
D. plaster of paris
Show Answer
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Discuss
Correct Answer: water
8. Fireclay bricks are never used in the
Options
A. beehive oven
B. coke oven walls
C. zinc roaster
D. lead blast furnace
Show Answer
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Discuss
Correct Answer: coke oven walls
9. The linear thermal expansion of __________ bricks upto 1000 °C is very low of the order of ? 0.5 percent.
Options
A. fireclay
B. silica
C. magnesite
D. corundum
Show Answer
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Discuss
Correct Answer: fireclay
10. Si percentage in silica refractories used in the walls of coke oven is about
Options
A. 45
B. 60
C. 80
D. 95
Show Answer
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Discuss
Correct Answer: 95
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