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Refractory Technology — Test 6

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Question 1
Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?
Question 2
Use of higher percentage of lime for bonding silica bricks, reduces their__________________?
Question 3
Magnesite chrome refractories____________________?
Question 4
‘Super refractories’ are made from pure____________________?
Question 5
Skull is not formed on the carbon blocks in the hearth of a blast furnace, when it becomes cold, because of its_______________?
Question 6
Maximum safe working temperature for fireclay bricks is about __________ °C?
Question 7
Which is the stable form of silica between 1470°C and the melting point 1713°C ?
Question 8
Cold crushing strength of a refractory does not depend upon its ____________________?
Question 9
Thoria__________________?
Question 10
Chromite refractories are_____________________?