Related Questions

Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
A 1800
B 2200
C 2400
D 2700
Refractoriness/fusion points of 'superduty' refractories is __________ °C.
A 1520-1630
B 1630-1670
C > 1730
D > 2000
With increase in the alumina content, the refractoriness of high alumina refractories
A Increases
B Decreases
C Remains same
D May increase or decrease
Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for __________ bricks.
A Fireclay
B Silica
C Dolomite
D Very low alumina
With increase in the alumina content in firebricks, its fusion point (refractoriness)
A Decreases linearly
B Remains unchanged
C Increases
D Decreases
Test specimen for determination of refractoriness under load (RUL) of a refractory is heated in a
A Furnace employing neutral atmosphere
B Carbon resistance furnace
C Reducing atmosphere
D Furnace employing negative pressure
Refractoriness under load (RUL) is the most important property for the refractory bricks
A At the hearth bottom of the furnace on which stock is placed
B Used for furnace insulation
C Used in the roof of the furnace
D None of these
Which of the following impurities reduces the refractoriness of magnesite bricks?
A Al2O3
B CaO
C SiO2
D All of the above
MgO এর ক্ষেত্রে কোনটি মিথ্যা?
A অক্সিজেন পরমাণু ইলেক্ট্রন গ্রহণ করে
B Mg হলো বিজারক পদার্থ
C অক্সিজেন দ্বারা Mg বিজারিত হয়
D MgO -এর পরমাণুর জারণ সংখ্যা বৃদ্ধি পায়

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