Refractory Technology Mcqs for Chemical


Q.  Porosity is induced in insulating refractories by adding________________?

a. Powdered naphthalene
b. Ammonium chloride/sulphate
c. Calcium phosphate
d. All A., B. and C.


ANSWER: See Answer
 
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MCQs:  Thermal spalling mainly occurs during _____________ of furnaces?
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MCQs:  High alumina refractories are used in the ___________________?
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MCQs:  _____________ is not a single oxide-refractory?
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MCQs:  Chrome magnesite brick is not used for lining the___________________?
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MCQs:  Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of ______________ percent respectively?
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MCQs:  ____________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold?
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MCQs:  Rotary kilns meant for calcination of limestone are lined with chrome magnesite in ______________ zone?
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MCQs:  Semi-silica bricks compared to silica bricks have_______________?
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MCQs:  Which of the following impurities reduces the refractoriness of magnesite bricks ?
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MCQs:  SiO2 percentage in firebrick is about____________________?
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MCQs:  ‘Spinel’, a refractory mineral is chemically represented as____________________?
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MCQs:  With increase in the density of silica refractories, its_______________?
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MCQs:  Mixing of ground refractory material and water is done in a ______________ mill?
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MCQs:  Silicon carbide refractories are used in the _____________?
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MCQs:  Firing temperature of magnesite bricks is about _____________ °C?
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MCQs:  Which of the following is not an acidic refractory?
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MCQs:  Grog__________________?
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MCQs:  Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?
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MCQs:  Refractoriness of a typical silica brick corresponds to Segar cone number, ’32’, which is equivalent to a temperature of _____________ °C?
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MCQs:  With increase in the alumina content in firebricks, its fusion point (refractoriness) ?
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