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Refractory Technology

Refractory Technology
Which form of silica has the highest specific gravity?

Quartz
All of these
Tridymite
Cristobalite

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Refractory Technology
Machine moulding of dry mixture of refractories requires a pressure of the order of __________ kg/cm².

100
1000
10
500

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Refractory Technology
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 .

450
65
250
150

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Refractory Technology
Fusion point of an acidic refractory material is

Increased by the addition of basic oxides
Not affected by the addition of basic oxides
Not affected by the addition of basic oxides
Reduced by the addition of basic oxides

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Refractory Technology
Porosity is induced in insulating refractories by adding

All of these
Calcium phosphate
Ammonium chloride/sulphate
Powdered naphthalene

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Refractory Technology
Zircon refractories have

All of these
High spalling resistance
High RUL (1600°C) and refractoriness (> 2000°C)
Low co-efficient of expansion

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