Related Questions

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
As compared to ordinary portland cement, high alumina cement has
A Higher initial setting time but lower final setting time
B Lower initial setting time but higher final setting time
C Higher initial and final setting times
D Lower initial and final setting times
For the manufacture of Portland cement, the proportions of raw materials used, are
A Lime 63% ; silica 22% ; other ingredients 15%
B Lime 22% ; silica 63% ; other ingredients 15%
C Silica 40% ; lime 40% ; other ingredients 20%
D Silica 70% ; lime 20% ; other ingredients 10%
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
Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as
A Quick setting cement
B Rapid hardening cement
C White cement
D Low heat Portland cement
With increasing alumina content, the fusion point of high alumina refractories
A Increases
B Decreases
C Remains constant
D May increase or decrease ; depends on its alumina content
Maximum alumina content in high alumina refractory can be as high as __________ percent.
A 30
B 50
C 70
D 90
With increase in the alumina content, the refractoriness of high alumina refractories
A Increases
B Decreases
C Remains same
D May increase or decrease
Raw materials used for producing __________ cement does not contain iron oxide.
A Waterproof
B Slag
C White
D Pozzolan

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