Refractory Technology MCQs

212 MCQs  — Chemical Engineering MCQs  (Page 6 of 22)

Attempt Refractory Technology Quiz
Thermal spalling mainly occurs during _____________ of furnaces?
A. Cooling down
B. Warming up
C. Both a. & b.
D. Neither a. nor b.
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High alumina refractories are used in the ___________________?
A. Dome of blast furnace stoves
B. Electric arc furnace roof
C. Glass melting furnaces
D. All a., b. and c.
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_____________ is not a single oxide-refractory?
A. Zirconia
B. Silicon carbide
C. Magnesia
D. None of these
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Chrome magnesite brick is not used for lining the___________________?
A. Hearth of soaking pits
B. Bottom hearth of reheating furnace
C. Coke oven regenerator
D. Burning zone of limestone rotary kilns
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Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of ______________ percent respectively?
A. 80 and 20
B. 20 and 80
C. 50 and 50
D. 60 and 40
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____________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold?
A. High thermal conductivity
B. Low porosity
C. Non-wetting characteristics
D. High density
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Rotary kilns meant for calcination of limestone are lined with chrome magnesite in ______________ zone?
A. Preheating
B. Cooling
C. Burning
D. All the above
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Semi-silica bricks compared to silica bricks have_______________?
A. Less fusion point
B. Better spalling resistance
C. Both a. and b.
D. Neither a. not b.
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Which of the following impurities reduces the refractoriness of magnesite bricks ?
A. Al2o3
B. Cao
C. Sio2
D. All a., b. & c.
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SiO2 percentage in firebrick is about____________________?
A. 35-40
B. 55-60
C. 80-85
D. > 94
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Word of the Day
22 Jul
Combative
ready or eager to fight or argue.
لڑاکا، متنازع، جھگڑالو

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