Refractory Technology MCQs

212 MCQs  — Chemical Engineering MCQs  (Page 13 of 22)

Attempt Refractory Technology Quiz
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
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To resist spalling tendency, a refractory should have________________?
A. Greater diffusivity
B. Low specific heat
C. Low thermal co-efficient of expansion
D. All a., b. and c.
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Cermets are____________________?
A. Composite material containing both ceramic & metallic constituents
B. Having high strength & resistance to high temperature
C. Used in space vehicles, missiles & nuclear energy plants
D. All a., b. and c.
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Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory_________________?
A. Mortars
B. Cements
C. Castables
D. None of these
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Hot face insulating linings of high purity alumina fused mullite are used, where_________________?
A. Very high temperatures are involved
B. Highly reducing conditions are involved
C. Presence of iron or silica is harmful
D. All a., b. and c.
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Periclase refractory contains mainly________________?
A. Cao
B. Mgo
C. Al2o3
D. Sio2
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Silica bricks have low spalling resistance below 600°C, due to its________________?
A. Very high thermal conductivity
B. High co-efficient of expansion upto this temperature
C. High thermal diffusivity
D. Low refractoriness
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Magnesite refractories have low resistance to___________________?
A. Attack by basic slag
B. Abrasion
C. Disintegration on sudden change of temperature
D. Both b. and c.
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Which is a basic refractory ?
A. Fireclay
B. Silica
C. Chrome magnesite
D. None of these
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Tar dolomite bricks are used in the_________________?
A. Basic bessemer converter
B. Basic open hearth furnace
C. Electric furnaces
D. All a., b. and c.
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Word of the Day
24 Jul
Untenable
(especially of a position or view) not able to be maintained or defended against attack or objection.
ناقابل مدافعت، غیر مستحکم، جو دلیل سے ثابت نہ ہو سکے

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