Which of the following bricks are used for lining of furnaces ?

i. sedimentary rock
ii. aqueous rock
iii. silicious rock
The correct answer is:
A. only (i)
B. both (i) and (ii)
C. both (i) and (iii)
D. all (i), (ii) and (iii)

A. dicalcium silicate
B. tricalcium silicate
C. tricalcium aluminate
D. tetra calcium alumino ferrite

A. 5 to 10%
B. 20 to 30%
C. 50 to 60%
D. 70 to 80%

A. cast iron
B. wrought iron
C. mild steel
D. high carbon steel

A. balusters
B. newal posts
C. balustrades
D. railings

A. less than one year
B. 1 to 5 years
C. 5 to 10 years
D. more than 10 years