Dilatometer is used for the determination of ______________ of refractories? A. Modulus of ruptureB. Permanent linear change C. Resistance to CO attack D. RUL

Highest melting (m.p = 3070°C) oxide refractory is__________________? A. AluminaB. Thoria C. Zirconia D. Magnesia

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

Colour of fireclay bricks is_________________? A. Light buff to reddish buff B. Yellow C. Black D. None of these

Crushing strength of a refractory____________________? A. Increases with rise in service temperatureB. Decreases with rise in service temperature C. Is unaffected with change in service temperature D. Decreases with increase in porosity

The largest consumer of refractories is the _______________ industry? A. CementB. Metallurgical C. Fertiliser D. Power

The highest melting pure oxide (m.p. > 3000°C)is___________________? A. Thoria B. Alumina C. Beryllia D. Zirconia

Zirconia refractories are not used in_____________________? A. Making sheaths for thermocouple B. Lining high temperature ceramic kilnsC. Furnaces subjected to fluctuating temperature D. High frequency induction furnaces in the form of inductors

Dolomite bricks have good resistance to attack by_____________________? A. Molten steel B. Iron oxide C. Lime slag D. None of these

Fireclay refractories have __________________? A. Low co-efficient of thermal expansion B. Poor thermal spalling resistance C. Tendency to expand unduly high during firing D. Very high cost