Chemical Engineering MCQs

A. Strength
B. Abrasion resistance
C. Both a. & b.
D. Neither a. nor b.

A. Have better spalling resistance than chrome magnesite refractories
B. Have very low thermal co-efficient of expansion
C. Are not at all resistant to the corrosive action of iron oxide
D. Have very low (50 kg/cm2) cold crushing strength (c.c.s.), and cannot be used in metalcase

A. Carbides
B. Oxides
C. Borides
D. Nitrides

A. Non-wetting characteristic
B. High thermal conductivity
C. High crushing strength
D. None of these

A. 1150
B. 1300
C. 1450
D. 1550

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

A. Shape
B. Composition
C. Firing temperature
D. Texture

A. Has high fusion temperature (> 3000°c) but poor resistance to thermal shock
B. Has high resistance to basic slags
C. Which is expensive & radioactive, is used in crucibles for melting high purity metals
D. All a., b. and c.

A. Acidic refractory
B. Neutral refractory
C. Basic refractory
D. Fired at a temperature of 600°c only

A. Silica bricks
B. Low duty firebricks
C. High alumina bricks
D. Graphite blocks