Related Questions

Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
A 1800
B 2200
C 2400
D 2700
Silicon carbide refractories are used in the
A Muffle furnace
B Zinc smelting furnace
C Ceramic recuperators
D All of the above
The main raw material for manufacture of silicon carbide refractories is
A Corrundum
B Carborundum
C Bauxite
D Periclase
Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
Grinding wheel made of silicon carbide is most suitable for grinding materials of low tensile strength (e.g; tough bronze). Grinding is a __________ operation.
A Turning
B Dressing
C Forming
D Surface finishing
Except __________ , all other refractories are bad conductors of electricity (i.e, have low electrical conductivity).
A Fireclay
B Carborundum
C Graphite
D Chromite
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
Refractories used in/for __________ should have low thermal conductivity.
A Coke ovens
B Insulation
C Regenerators
D Muffle furnaces
In which of the following activities silicon carbide is used?
A Making cement and glass
B Disinfecting water of ponds
C Cutting very hard substances
D Making casts for statues
The silicon carbide abrasive is chiefly used for grinding
A Cemented carbide
B Ceramic
C Cast iron
D All of these

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