Refractory Technology MCQs

212 MCQs  — Chemical Engineering MCQs  (Page 12 of 22)

Attempt Refractory Technology Quiz
The main raw material for manufacture of silicon carbide refractories is_________________?
A. Corundum
B. Carborundum
C. Bauxite
D. Periclase
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Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the_________________?
A. Washing action of metal
B. Corrosion by layer of slag
C. Both a. & b.
D. Neither a. nor b.
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High density refractory bricks have lower__________________?
A. Spalling resistance
B. Thermal conductivity
C. Fusion point
D. Slag penetration resistance
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Fireclay bricks are used in the___________________?
A. Furnaces allowed to cool frequently
B. Flues
C. Chimney linings
D. All a., b. and c.
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Carbon refractory blocks ___________________?
A. Are wetted by molten iron
B. Are used in the hearth of blast furnace
C. Are acidic in nature
D. All a., b. and c.
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Chromite refractories are used in_______________?
A. Bottom of soaking pits
B. Between acid & basic linings in basic open hearth furnaces to prevent their chemical action
WitH each other
C. Both a. & b.
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Maximum apparent porosity of magnesite bricks is about _____________ percent?
A. 8
B. 24
C. 44
D. 58
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Cold crushing strength of refractories depends upon its_________________?
A. Composition
B. Texture
C. Firing temperature
D. All a., b. and c.
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Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves ?
A. High refractoriness
B. High resistance to spalling
C. High strength and density
D. All a., b. and c.
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Spalling resistance of a refractory cannot be increased by ____________________?
A. Increasing its porosity
B. Using a coarser grog during its manufacture
C. Decreasing its thermal co-efficient of expansion
D. Making it denser
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Word of the Day
24 Jul
Untenable
(especially of a position or view) not able to be maintained or defended against attack or objection.
ناقابل مدافعت، غیر مستحکم، جو دلیل سے ثابت نہ ہو سکے

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