Civil Concrete Tech and Design Part-2

Test Preparation on Civil Concrete Tech and Design Part-2

1.

Workability of concrete mix with the low water-cement ratio is determined by

1Tensile strength test
2Slump test
3Compaction factor test
4Flexural strength test

2.

If the average compressive strength is 4000 kg/cm2 and the standard deviation is 500, the coefficient of variation is

110 %
212.5 %
315 %
418.5 %

3.

The effect of creep on modular ratio is

1To decrease it
2To increase it
3Either to decrease or to increase it
4To keep it unchanged

4.

The type of aggregates not suitable for high strength concrete and for pavements subjected to tension is

1Rounded aggregate
2Irregular aggregate
3Angular aggregate
4Flaky aggregate

5.

The maximum percentage of chemical ingredients of cement is that of

1Magnesium oxide
2Iron oxide
3Silica
4Lime

6.

Select the incorrect statement

1The loss of pre-stress is more in pre-tensioning system than in post-tensioning system.
2Pre-tensioning system has greater certainty about its durability.
3For heavy loads and large spans in buildings or bridges, post-tensioning system is cheaper than pre-tensioning system
4None of the above

7.

The commercial name of white and coloured cement in India, is

1Colorcrete
2Silvicrete
3Snowcem
4All the above

8.

An excess of flaky particles in concrete aggregates

1Decreases the workability
2Increases the quantity of water and sand
3More than 15% are not desirable
4All the above

9.

Increase in the moisture content in concrete

1Reduces the strength
2Increases the strength
3Does not change the strength
4All of the above

10.

Pick up the correct statement from the following

1High percentage of C3S and low percentage of C2S cause rapid hardening
2High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack
3Low percentage of C3S and high percentage of C2S contribute to slow hardening
4All the above

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