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.Management Sciences
Category: Refractory Technology
Basic bricks are not made of ___________________?
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A. Fireclay
B. Magnesite
C. Forsterite
D. Chromite
Firing temperature is minimum (1250-1400 °C) for _______________ bricks?
A. Fireclay
B. Direct bonded basic
C. Silica
D. Magnesite
Refractoriness under loads (RUL) is quite close to the fusion temperature (PCE) for _____________ bricks?
A. Fireclay
B. Silica
C. Dolomite
D. Very low alumina
Which is not a natural insulating material ?
A. Diatomaceous earth/kieselgur
B. Asbestos
C. Vermiculite
D. None of these
Periclase is___________________?
A. Crystalline form of MgO
B. MgCO3
C. ZrSO4
D. Amorphous magnesite
Which one expands on heating ?
A. Silica bricks
B. Fireclay bricks
C. Both A. & B.
D. Neither A. nor B.
High refractoriness of refractory bricks means, that it has a________________?
A. High spalling resistance
B. Low spalling resistance
C. High resistance to fusion
D. Low porosity
With decrease in porosity, the ______________ of the refractories decreases?
A. Strength
B. Thermal conductivity
C. Spalling resistance
D. None of these
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