The preliminary test is repeated if the difference of compressive strength of th

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Question
The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds
Options
A. 5 kg/cm²
B. 8 kg/cm²
C. 10 kg/cm²
D. 12 kg/cm²
E. 15 kg/cm²

Correct Answer

15 kg/cm²

Concrete Technology problems

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2. The bulk density of aggregates does not depend upon :
Options
A. size and shape of aggregates
B. specific gravity of aggregates
C. grading of aggregates
D. size and shape of the container
E. none of these.

4. Pick up the correct proportions of chemical ingredients of cement
Options
A. Lime : Silica : Alumina : Iron oxide : 63 : 22 : 6 : 3
B. Silica : Lime : Alumina : Iron oxide : 63 : 22 : 6 : 3
C. Alumina : Silica : Lime : Iron oxide : 63 : 22 : 6 : 3
D. Iron oxide : Alumina : Silica : Lime : 63 : 22 : 6 : 3

5. For road pavements, the cement generally used, is
Options
A. ordinary Portland cement
B. rapid hardening cement
C. low heat cement
D. blast furnace slag cement
E. none of these.

8. The equation which is obtained by multiplying each equation by the coefficient of its un-knowns and by adding the equations thus formed, is known as
Options
A. observation equation
B. conditional equation
C. normal equation
D. none of these.

9. Polaris is usually observed for the determination of the azimuth when it is
Options
A. at culmination
B. at elongation
C. neither at culmination nor at elongation
D. either at culmination or at elongation.

10. The parallax equation is applicable to entire overlap of the photographs only if parallax is measured
Options
A. normal to base line
B. parallel to base line
C. both (a) and (b)
D. neither (a) nor (b).

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