Related Questions

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is
A 5CaO . 3Al2O3
B 3CaO . Al2O3
C 3CaO . SiO2
D 2CaO . SiO2
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%
The inventory of raw materials included in the working capital is usually about __________ months supply of raw materials valued at delivery prices.
A One
B Three
C Six
D Twelve
When Mr. Sen imports some raw materials he has to pay 7% import duty on the portion of the total value of the item in excess of TK. 1000. If the amount of import duty he paid was TK. 87.50 then what was the value of the raw material that he imported ?
A TK. 1,250
B TK.2,250
C TK. 2,500
D TK. 2,750
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%
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
For testing compressive and tensile strength of cement, the cement mortar is made by mixing cement and standard sand in the proportions of
A 1 : 2
B 1 : 3
C 1 : 4
D 1 : 6
When an iron nail gets rusted, iron oxide is formed
A Without any change in the weight of the nail
B With decrease in the weight of the nail
C With increase in the weight of the nail
D Without any change in colour or weight of the nail
Which of the following countries are almost full dependent on imported raw materials for iron and steel industries?
A Britain
B Japan
C Poland
D Germany
Which of the following countries are almost fully dependent on imported raw materials for iron and steel industries?
A Britain
B Japan
C Poland
D Germany

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