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MCQs 1: Vacuum steel degassing units are lined with__________________?

Silica bricks Low duty firebricks High alumina bricks Graphite blocks
Answer Explanation

MCQs 2: With increasing alumina content, the fusion point of high alumina refractories__________________?

Increases Decreases Remain constant May increase or decrease; depends on its alumina content
Answer Explanation

MCQs 3: Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?

High duty fireclay Silica Mullite Carborundum
Answer Explanation

MCQs 4: Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as ______________ kg/cm2?

450 250 150 65
Answer Explanation

MCQs 5: Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of______________?

Segar cones Muffles for muffle furnaces Insulating bricks Crucibles used for melting of high purity metals
Answer Explanation

MCQs 6: PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of ____________ °C?

1520 1630 1670 1730
Answer Explanation

MCQs 7: Spray test determines the _____________ of refractories?

Resistance to slag penetration Resistance to CO attack RUL Permanent linear change
Answer Explanation

MCQs 8: Fireclay refractories have __________________?

Low co-efficient of thermal expansion Poor thermal spalling resistance Tendency to expand unduly high during firing Very high cost
Answer Explanation

MCQs 9: Dolomite bricks have good resistance to attack by_____________________?

Molten steel Iron oxide Lime slag None of these
Answer Explanation

MCQs 10: Zirconia refractories are not used in_____________________?

Making sheaths for thermocouple Lining high temperature ceramic kilns Furnaces subjected to fluctuating temperature High frequency induction furnaces in the form of inductors
Answer Explanation

MCQs 11: The highest melting pure oxide (m.p. > 3000°C)is___________________?

Thoria Alumina Beryllia Zirconia
Answer Explanation

MCQs 12: The largest consumer of refractories is the _______________ industry?

Cement Metallurgical Fertiliser Power
Answer Explanation

MCQs 13: Crushing strength of a refractory____________________?

Increases with rise in service temperature Decreases with rise in service temperature Is unaffected with change in service temperature Decreases with increase in porosity
Answer Explanation

MCQs 14: Colour of fireclay bricks is_________________?

Light buff to reddish buff Yellow Black None of these
Answer Explanation

MCQs 15: Slide gates in teeming laddie used for steel pouring in ingot moulds is lined with _____________ bricks?

Bakelite impregnated or fused periclase Silica Semi-silica Fireclay
Answer Explanation

MCQs 16: Highest melting (m.p = 3070°C) oxide refractory is__________________?

Alumina Thoria Zirconia Magnesia
Answer Explanation

MCQs 17: Dilatometer is used for the determination of ______________ of refractories?

Modulus of rupture Permanent linear change Resistance to CO attack RUL
Answer Explanation

MCQs 18: Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?

Fireclay Silica Dolomite Very low alumina
Answer Explanation

MCQs 19: The maximum linear expansion of silica bricks during firing is about ______________ percent?

0.5 1 2 3.5
Answer Explanation

MCQs 20: Hot blast main (carrying air at 1000°C) in blast furnace are lined with ______________ bricks?

Silica Fireclay Magnesite Zirconia
Answer Explanation

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