The highest melting pure oxide (m.p. > 3000°C)is___________________?

A. Thoria
B. Alumina
C. Beryllia
D. Zirconia

The largest consumer of refractories is the _______________ industry?

A. Cement
B. Metallurgical
C. Fertiliser
D. Power

Crushing strength of a refractory____________________?

A. Increases with rise in service temperature
B. Decreases with rise in service temperature
C. Is unaffected with change in service temperature
D. Decreases with increase in porosity

Colour of fireclay bricks is_________________?

A. Light buff to reddish buff
B. Yellow
C. Black
D. None of these

Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?

A. Bakelite impregnated or fused periclase
B. Silica
C. Semi-silica
D. Fireclay

Highest melting (m.p = 3070°C) oxide refractory is__________________?

A. Alumina
B. Thoria
C. Zirconia
D. Magnesia

Dilatometer is used for the determination of ______________ of refractories?

A. Modulus of rupture
B. Permanent linear change
C. Resistance to CO attack
D. RUL

Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?

A. Fireclay
B. Silica
C. Dolomite
D. Very low alumina

The maximum linear expansion of silica bricks during firing is about ______________ percent?

A. 0.5
B. 1
C. 2
D. 3.5

Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?

A. Silica
B. Fireclay
C. Magnesite
D. Zirconia