Refractory Technology MCQs

increasing its porosity.

using a coarser grog during its manufacture.

decreasing its thermal co-efficient of expansion.

making it denser.

coke oven walls.

beehive coke ovens.

dome and upper portion of B.F. stoves.

open hearth furnace roof.

1800

2200

2400

2700

chrome or magnesite

silicon carbide

silica

lowduty fireclay

500

1000

>1350

>2000

specific gravity

fusion point

RUL

none of these

silica

fireclay

dolomite

magnesite

lime

basic

acid

none of these

increases with decrease in porosity.

decreases with decreases in porosity.

is independent of its porosity and is maximum for insulating bricks.

increases with the amount of air entrapped in pores.

Zircon

Thoria

Carborundum

Beryllia