Category: Refractory Technology

A. Powdered naphthalene
B. Ammonium chloride/sulphate
C. Calcium phosphate
D. All A., B. and C.

A. Superduty fireclay
B. High alumina
C. Silica
D. Carborundum

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. Basic
B. Neutral
C. High alumina
D. Insulating

A. Basic Bessemer converter
B. Basic open hearth furnace
C. Electric furnaces
D. All A., B. and C.

A. Does not react with basic slags
B. Is produced from baddeleyite
C. Cannot be used as an insulator
D. Has poor electrical conductivity at high temperature

A. Hearth of soaking pits
B. Bottom hearth of reheating furnace
C. Coke oven regenerator
D. Burning zone of limestone rotary kilns

A. Chrome magnesite
B. Magnesite
C. Dolomite
D. Silicon carbide

A. Attack by basic slag
B. Abrasion
C. Disintegration on sudden change of temperature
D. Both B. and C.

A. Mortars
B. Cements
C. Castables
D. None of these