Category: Refractory Technology

A. 10
B. 15
C. 20
D. 30

A. 1520-1630
B. 1630-1670
C. > 1730
D. > 2000

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

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.

A. High refractoriness
B. High resistance to spalling
C. High strength and density
D. All A., B. and C.

A. Al2O3
B. CaO
C. SiO2
D. All A., B. & C.

A. Mainly contains quartz
B. Is not stable at high temperature
C. Transforms to other allotropic forms i.e. Tridymite and Cristobalite involving very high
volume changes
D. All A., B. and C.

A. Spalling resistance
B. Thermal conductivity
C. Fusion point
D. Slag penetration resistance

A. Tar bonded dolomite bricks
B. Fireclay bricks
C. Magnesite bricks
D. Chromite bricks

A. Lime
B. Basic
C. Acid
D. None of these