A. Modulus of rupture
B. Permanent linear change
C. Resistance to CO attack
D. RUL
Dilatometer is used for the determination of ______________ of refractories? Read More »
Refractory Technology A. Alumina
B. Thoria
C. Zirconia
D. Magnesia
Highest melting (m.p = 3070°C) oxide refractory is__________________? Read More »
Refractory Technology A. Bakelite impregnated or fused periclase
B. Silica
C. Semi-silica
D. Fireclay
A. Light buff to reddish buff
B. Yellow
C. Black
D. None of these
Colour of fireclay bricks is_________________? Read More »
Refractory Technology 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
Crushing strength of a refractory____________________? Read More »
Refractory Technology A. Cement
B. Metallurgical
C. Fertiliser
D. Power
The largest consumer of refractories is the _______________ industry? Read More »
Refractory Technology A. Thoria
B. Alumina
C. Beryllia
D. Zirconia
The highest melting pure oxide (m.p. > 3000°C)is___________________? Read More »
Refractory Technology A. Making sheaths for thermocouple
B. Lining high temperature ceramic kilns
C. Furnaces subjected to fluctuating temperature
D. High frequency induction furnaces in the form of inductors
Zirconia refractories are not used in_____________________? Read More »
Refractory Technology A. Molten steel
B. Iron oxide
C. Lime slag
D. None of these
Dolomite bricks have good resistance to attack by_____________________? Read More »
Refractory Technology A. Low co-efficient of thermal expansion
B. Poor thermal spalling resistance
C. Tendency to expand unduly high during firing
D. Very high cost
Fireclay refractories have __________________? Read More »
Refractory Technology