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Refractory Technology

Refractory Technology
Refractories are dried in the

Sun
None of these
Tunnel kilns
Rotary kilns

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Refractory Technology
'Spinel', a refractory mineral is chemically represented as

MgAl2O₃.2H₂O
MgAl2O₄
MgAl2O₃
MgSO₄

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Refractory Technology
Semi-silica bricks compared to silica bricks have

Both A & B
Less fusion point
Better spalling resistance
Neither A nor B

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Refractory Technology
Pyrometric cone equivalent (PCE) value (Segar cone) of 'superduty refractories' is more than 33 which corresponds to a temperature of __________ °C.

1730
1520
1670
1630

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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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Refractory Technology
Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of

Fireclay
Siliceous fireclay
Silicon carbide
Corrundum

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