A. Increase the density of cement
B. Decrease the cement setting rate
C. Both A. and B.
D. Neither A. nor B.
Related Mcqs:
- One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to_________________?
A. Adjust the pH of the syrup
B. Remove the coloring matter from the syrup
C. Reduce the viscosity of the syrup
D. Improve the rate of crystallisation of sugar - The compressive strength of cement should not be less than about 110Kg/cm2 after three days & not less than 170Kg/cm2 after seven days. The fineness of an ordinary cement as determined by turbidimetric method should be about ________________ cm2/gm?
A. 800
B. 1600
C. 4000
D. 8500 - Flux addition during smelting of ore is done to___________________?
A. Remove impurities/gangue
B. Enhance rate of reaction
C. Accelerate reduction of ore
D. Separate slag from metal - Transportation of 35% oleum during winter suffers from the problem of freezing, which can be overcome by the addition of small quantity of_____________________?
A. Nitric acid
B. Hydrochloric acid
C. Methyl alcohol
D. Formic acid - Co-efficient of thermal expansion of glass is decreased by the addition of _______________ during its manufacture?
A. CaO
B. MnO2
C. ZnO
D. FeS - Calcination of gypsum produces__________________?
A. Plaster of Paris
B. Salt cake
C. Nitre cake
D. Lime - Gypsum is chemically __________________ ?
A. Calcium chloride
B. Potassium sulphate
C. Sodium sulphate
D. Calcium sulphate - Fusion of bauxite and ________________ produces high alumina cement?
A. Alum
B. Limestone
C. Coke
D. Quartz - Cement mainly contains_________________?
A. CaO, SiO2, Al2O3
B. MgO, SiO2, K2O
C. Al2O3, MgO, Fe2O3
D. CaO, MgO, K2O - ________________ is the major constituent of the Portland cement?
A. Calcium carbonate
B. Calcium oxide
C. Tricalcium silicate
D. Calcium sulphate
