Related Questions

Silicon carbide refractories are used in the
A Muffle furnace
B Zinc smelting furnace
C Ceramic recuperators
D All of the above
silicon carbide refractories have very low
A [

A. Refractoriness (

B. Thermal conductivity

B Resistance to thermal shock
C None of these
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
Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
A 55
B 70
C 80
D 90
The price of raw meterials had gone up by 15% labor cost has also increased from 25% of the cost of ras material to 30% of the cost of raw material. By how much percentage should there be reduction in the usage of raw materials so as to keep the cost same?
A 28%
B 17%
C 27%
D 24%
Most easily and cheaply available fibrous raw material for paper manufacture available in India is bamboo. The yield of pulp produced from fibrous raw material by mechanical process is about __________ percent.
A 75
B > 30
C 50
Faster rate of drying of moulded refractories results in high __________ of refractories.
A Green strength
B Voids
C Shrinkage
D Both B and C
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
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

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