Concrete Technology And Design Of Concrete Structures MCQ Questions & Answers

1

In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

A) Compressive and tensile B) Tensile and compressive C) Both compressive D) Both tensile

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Answer & Solution

Answer: Option B

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2

Critical section for shear in case of flat slabs is (adopting standard notations)

A) At a distance of effective depth of slab from periphery of column/drop panel B) At a distance of $$\frac{{\text{d}}}{2}$$ from periphery of column/capital/drop panel C) At the drop panel of slab D) At the periphery of column

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Answer & Solution

Answer: Option B

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3

If the depth of neutral axis for a singly reinforced rectangular section is represented by kd in working stress design, then the value of k for balanced section

A) depends on as, only B) depends on aCbC only C) depends on both crst and acbc D) is independant of both ast and acbc where d is the effective depth, ast is per-missible stress in steel in tension and ocbc is permissible stress in concrete in bending compression.

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Answer & Solution

Answer: Option A

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4

The diameter of ties in a column should be

A) More than or equal to one fourth of diameter of main bar B) More than or equal to 5 mm C) More than 5 mm but less than one-fourth of diameter of main bar D) More than 5 mm and also more than one-fourth of diameter of main bar

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Answer & Solution

Answer: Option D

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5

Bulking of sand is maximum if moisture content is about

A) 2% B) 4% C) 6% D) 10%

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Answer & Solution

Answer: Option B

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6

If a beam fails in bond, then its bond strength can be increased most economically by

A) Increasing the depth of beam B) Using thinner bars but more in number C) Using thicker bars but less in number D) Providing vertical stirrups

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Answer & Solution

Answer: Option B

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7

For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

A) 0.75 - 0.80 B) 0.80 - 0.85 C) 0.85 - 0.92 D) Above 0.92

Discuss

Answer & Solution

Answer: Option D

Solution:

Workability of concrete refers to how easily fresh concrete can be mixed, placed, compacted, and finished.

Compacting factor is one of the measures used to assess the workability of concrete, especially in laboratory tests.

For heavily reinforced sections, concrete must be able to flow easily and fill the formwork and spaces around the reinforcement without leaving voids.

When vibration is not used, the concrete must be highly workable to achieve adequate compaction under its own weight.

A compacting factor of above 0.92 indicates high workability, which is suitable for such conditions.

Therefore, for concreting heavily reinforced sections without vibration, the compacting factor should be above 0.92.

8

Ultimate strength of cold drawn high steel wires

A) Increases with increase in diameter of bar B) Decreases with increase in diameter of bar C) Does not depend on diameter of bar D) None of the above

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Answer & Solution

Answer: Option B

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9

In working stress design, permissible bond stress in the case of deformed bars is more than that in plain bars by

A) 10% B) 20% C) 30% D) 40%

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Answer & Solution

Answer: Option D

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10

The percentage of voids in cement is approximately

A) 25% B) 40% C) 60% D) 80%

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Answer & Solution

Answer: Option B

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Concrete Technology And Design Of Concrete Structures MCQ Questions & Answers | Civil Engineering