For a beam with varying moment of inertia, the flexibility coefficient method requires:

The correct answer is B: Integration with variable EI. Flexibility coefficients for non-uniform beams require integration accounting for variable EI along the length.

For a two-span continuous beam with equal spans and equal loads, which statement is true?

The correct answer is A: Support moments are equal at both interior supports. For symmetric loading and equal spans, interior support moments are equal due to symmetry of structure and loading.

In virtual work method, if a unit load is applied instead of actual load, the virtual displacement is equal to:

The correct answer is A: Actual displacement. Virtual work principle: Work done by actual loads through virtual displacements equals work by virtual loads through actual displacements.

Which of the following is a measure of concrete workability?

The correct answer is A: Slump test. Slump test is the most common field test to measure the workability and flow characteristics of fresh concrete.

For a continuous beam analyzed using the unit load method for deflection, the fictitious load pattern applied is:

The correct answer is B: Concentrated at point of interest. Unit load method (virtual work) requires applying a unit load (or moment for slope) at the point where deflection (or slope) is required.

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Civil Engineering
Concrete Technology

Structures, surveying, soil mechanics

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Difficulty: All Easy Medium Hard 1–3 of 3

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All Structural Analysis 92 Concrete Technology 19

Q.1 Hard Concrete Technology

Self-compacting concrete (SCC) must achieve a slump flow of:

A 150-250 mm

B 300-500 mm

C 600-800 mm

D 900-1000 mm

Correct Answer: C. 600-800 mm

EXPLANATION

SCC requires slump flow between 600-800 mm to flow and compact under its own weight without vibration.

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Q.2 Hard Concrete Technology

According to Abrams' Law, the relationship between w/c ratio and compressive strength is:

A Linear positive relationship

B Inverse/Negative exponential relationship

C No relationship

D Directly proportional

Correct Answer: B. Inverse/Negative exponential relationship

EXPLANATION

Abrams' Law states that compressive strength decreases exponentially with increase in water-cement ratio.

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Q.3 Hard Concrete Technology

Which chemical compound in cement causes flash setting when exposed to water?

A C3S (Tricalcium Silicate)

B C2S (Dicalcium Silicate)

C C3A (Tricalcium Aluminate)

D C4AF (Tetracalcium Aluminoferrite)

Correct Answer: C. C3A (Tricalcium Aluminate)

EXPLANATION

C3A reacts rapidly with water and is responsible for flash setting. Gypsum is added to control this reaction.

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