Rate of slag attack on refractories increases with rise in temperature due to the___________________?

A. Acidic in nature
B. Neutral in nature
C. Having higher RUL than silica bricks
D. Made by mixing 30% Chromite and 70% Periclase

A. Quartz
B. Cristobalite
C. Tridymite
D. None of these

A. Producing monolithic linings
B. Patch work
C. Minimising the number of joints in the structure
D. All A., B. and C.

A. Depends on the nature of slag & refractory
B. Decreases at higher temperature
C. Decreases, if defective joints & cracks exist in the refractory
D. All A., B. and C.

A. Cupola
B. Gas producer
C. Bottom of hot metal mixer
D. Roof of open hearth furnace

A. Bottom of soaking pits
B. Between acid & basic linings in basic open hearth furnaces to prevent their chemical action
with each other
C. Both A. & B.
D. Neither A. and B.