Refractory Technology Mcqs for Chemical


Q.  Periclase refractory contains mainly________________?

a. CaO
b. MgO
c. Al2O3
d. SiO2


ANSWER: See Answer
 
No explanation is available for this question!
MCQs:  10 to 30% magnesite is added to Chromite to produce chrome-magnesite refractories. Magnesite addition is mainly done to improve the _____________ of Chromite?
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MCQs:  Furnace atmosphere for softening temperature determination of refractories (in which Seger Cones are placed) should be __________________?
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MCQs:  Ramming masses are used for____________________?
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MCQs:  Pyrometric cone equivalent (PCE) of a refractory is the measure of its_________________?
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MCQs:  Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?
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MCQs:  Use of higher percentage of lime for bonding silica bricks, reduces their__________________?
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MCQs:  Magnesite chrome refractories____________________?
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MCQs:  ‘Super refractories’ are made from pure____________________?
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MCQs:  Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its_______________?
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MCQs:  Maximum safe working temperature for fireclay bricks is about __________ °C?
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MCQs:  Which is the stable form of silica between 1470°C and the melting point 1713°C ?
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MCQs:  Cold crushing strength of a refractory does not depend upon its ____________________?
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MCQs:  Thoria__________________?
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MCQs:  Chromite refractories are_____________________?
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MCQs:  Vacuum steel degassing units are lined with__________________?
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MCQs:  With increasing alumina content, the fusion point of high alumina refractories__________________?
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MCQs:  Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?
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MCQs:  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?
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MCQs:  Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of______________?
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MCQs:  PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of ____________ °C?
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