Refractory Technology MCQs

212 MCQs  — Chemical Engineering MCQs  (Page 17 of 22)

Attempt Refractory Technology Quiz
Vacuum steel degassing units are lined with__________________?
A. Silica bricks
B. Low duty firebricks
C. High alumina bricks
D. Graphite blocks
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With increasing alumina content, the fusion point of high alumina refractories__________________?
A. Increases
B. Decreases
C. Remain constant
D. May increase or decrease; depends on its alumina content
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Walls, roofs & combustion chambers of annealing furnaces are made of ______________ bricks?
A. High duty fireclay
B. Silica
C. Mullite
D. Carborundum
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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?
A. 450
B. 250
C. 150
D. 65
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Thoria is an expensive refractory material and is radioactive in nature. Thorium oxide is used in the manufacture of______________?
A. Segar cones
B. Muffles for muffle furnaces
C. Insulating bricks
D. Crucibles used for melting of high purity metals
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PCE value (Segar cone) of Superduty refractories is more than 33, which is equivalent to a temperature of ____________ °C?
A. 1520
B. 1630
C. 1670
D. 1730
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Spray test determines the _____________ of refractories?
A. Resistance to slag penetration
B. Resistance to co attack
C. Rul
D. Permanent linear change
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Fireclay refractories have __________________?
A. Low co-efficient of thermal expansion
B. Poor thermal spalling resistance
C. Tendency to expand unduly high during firing
D. Very high cost
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Dolomite bricks have good resistance to attack by_____________________?
A. Molten steel
B. Iron oxide
C. Lime slag
D. None of these
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Zirconia refractories are not used in_____________________?
A. Making sheaths for thermocouple
B. Lining high temperature ceramic kilns
C. Furnaces subjected to fluctuating temperature
D. High frequency induction furnaces in the form of inductors
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Word of the Day
23 Jul
Aisle
a passage between rows of seats in a building such as a church or theatre, an aircraft, or train.
طویل تنگ راستہ، نشتوں کے درمیان راستہ

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