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
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
As compared to ordinary portland cement, use of pozzuolanic cement
A Reduces workability
B Increases bleeding
C Increases shrinkage
D Increases strength
The main ingredients of Portland cement are
A Lime and silica
B Lime and alumina
C Silica and alumina
D Lime and iron
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
The maximum quantity of calcium chloride used as an accelerator in cement in percentage by weight of cement is
A 1
B 2
C 3
D 4
The compound of Portland cement which reacts immediately with water and also sets first is
A Tri-calcium silicate
B Di-calcium silicate
C Tri-calcium aluminate
D Tetra calcium alumino ferrite
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
Ordinary Portland Cement এর Initial Setting Time কত?
A ৫ মিনিট
B ১০ মিনিট
C ৩০ মিনিট
D ৫ ঘণ্টা
The normal consistency of ordinary Portland cement is about
A 10%
B 20%
C 30%
D 40%

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