- Building Materials - Section 1
- Building Materials - Section 2
- Building Materials - Section 3
- Building Materials - Section 4
- Building Materials - Section 5
- Building Materials - Section 6
- Building Materials - Section 7
- Building Materials - Section 8


Building Materials - Engineering
Q1: The percentage of alumina and silica in good fire clay vary respectively isA
25, 75
B
30, 70
C
35, 65
D
All of these.
ANS:A - 25, 75 Fire clay is used to make fire bricks and is generally found under the coal seams. Fire clay contains two major constituents- silica and alumina, of which, the silica percentage varies from 60 to 70% and alumina varies from 25 to 35%.
For low duty fireclay 22% to 27% Alumina and 67% to 71% silica. |


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