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
Given that, 24 carat gold is pure gold, 18 carat gold is 3/4th of pure gold and 20 carat gold is 5/6th of pure gold, the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is -
A 5 : 8
B 10 : 9
C 8 : 5
D 9 : 10
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 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
Main constituents of portland cement are calcium aluminate and
A Gypsum
B Silicates
C Sodium silicate
D Carbonates
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%
Addition of pozzolana to ordinary Portland cement increases
A Bleeding
B Shrinkage
C Permeability
D Heat of hydration
As per IS specifications, the maximum final setting time for ordinary Portland cement should be
A 30 minutes
B 1 hour
C 6 hours
D 10 hours

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