Refractory Technology Mcqs
Q.1: Pick out the wrong statement ?
A. A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscousX
B. state is termed s glass
C. Ceramic materials do not undergo vitrification on heating9
D. Ceramic materials are brittle in nature'
Q.2: Pick out the wrong statement?
A. Fluxing material like lime is added in clay to reduce the vitrification temperatureS
B. Main constituents of clay are alumina and silica0
C. Addition of sand in ceramic materials makes it non-plastic, increases its fusion point andZ
D. reduces its shrinkage on burning
Q.3: Pick out the wrong statement ?
A. Electrical conductivity of refractory is not important, when these are to be used in electrical_
B. furnaces
C. Graphite and metals are the good electrical conductor among the refractories and others are all_
D. electrical insulators
Q.4: Pick out the wrong statement?
A. Sand & coke is the main raw material for the manufacture of silicon carbideK
B. Carbon refractories cannot be used in the furnaces operating under reducing conditionsV
C. Mullite can be obtained by the heating of alusite, kyanite or sillimaniteI
D. Silica occurs in nature in all cellular, amorphous or crystalline formF
Q.5: Pick out the wrong statement ?
A. Refractories used in muffle furnace should have low thermal conductivityH
B. The electrical resistivity of refractories drops rapidly with rise in temperatureQ
C. For reducing spalling tendency, the refractory should be well fired and its porosity should be^
D. more
Q.6: Pick out the wrong statement?
A. Insulating refractories used in place of regular refractory bricks are usually called light weightb
B. refractories, and they have similar composition as heavy bricks?
C. Graphite refractories are also called plumbago refractories;
D. Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28M
Q.7: Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?c
A. Silicon carbide
B. Silicon nitride
C. Crystalline magnesia
D. Zirconium sulphate
Q.8: Permeability of bricks is a measure of the_________________?<
A. Refractoriness
B. Melting point
C. Rate at which a fluid will pass through the pores1
D. Expansion during heating
Q.9: Fireclay bricks are not used in the_____________________?9
A. Blast furnace
B. Hot blast stove
C. Cupola
D. Wall of coke oven
Q.10: Which form of silica has the highest specific gravity ?7
A. Quartz
B. Cristobalite
C. Tridymite
D. All have the same specific gravity"

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