Design of Concrete Structures MCQs

Free 137+ Design of Concrete Structures MCQs for PPSC, FPSC, NTS, and Pakistan government job tests. Practise below with answers and explanations.

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137 questions in this list. Select an option to practice, or open a question for the full page with explanation.

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Design of Concrete Structures

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1.What is the main function of reinforcement in prestressed concrete?

To ensure sufficient bond strengthTo counteract tensile forcesTo introduce initial compressive stress into the concreteAll of these purposes

2.Which technique is most frequently employed for prestressing in factory manufacturing?

Long line methodFreyssinet techniqueMagnel-Blaton approachLee-Macall procedure

3.Prestress losses caused by friction are observed in which type of beams?

Exclusively in post-tensioned beamsExclusively in pretensioned beamsIn both post-tensioned and pretensioned beamsIn none of the above types

4.What effect does a high carbon concentration have on the properties of steel?

Reduces tensile strength while enhancing ductilityEnhances tensile strength but lowers ductilityLowers both tensile strength and ductilityImproves both tensile strength and ductilityNo significant impact on tensile strength or ductility

5.How does the ultimate strength of cold drawn high steel wires change with the increase in the diameter of the wire?

It rises as the wire diameter growsIt declines as the wire diameter expandsIt remains unaffected by the wire diameterNone of the given choices

6.What is the minimum required cube strength of controlled concrete for use in pretensioned and post-tensioned applications, respectively?

35 MPa for pretensioned and 42 MPa for post-tensioned concrete42 MPa for pretensioned and 35 MPa for post-tensioned concrete42 MPa for pretensioned and 53 MPa for post-tensioned concrete53 MPa for pretensioned and 42 MPa for post-tensioned concrete

7.How is the yield point characterized in the stress-strain curve of high tensile steel?

It exhibits a clear and distinct yield point.There is no clear yield point, but it is determined by 0.1% proof stress.No distinct yield point is visible; instead, the yield strength is defined by 0.2% proof stress.The yield point is not distinct and is identified by 2% proof stress.

8.Which type of wire exhibits the greatest tensile strength?

Hot rolled wires without any additional processingWires that have been cold drawnRolled wires subjected to heat treatmentAll types possess equal tensile strength

9.Which type of prestress loss is exclusive to pretensioned concrete and does not happen in post-tensioned concrete?

Elastic shortening of the concreteConcrete shrinkageConcrete creepFrictional losses

10.In typical prestressed concrete beams, where are the prestressing wires usually positioned?

At the top section of the beamAt the bottom section of the beamAlong the midpoint of the beamIn any location within the beamNone of the above

11.In prestressed concrete, which statement correctly describes the behavior of tension and compression forces along with the lever arm?

Tension and compression forces vary, but the lever arm stays constant.Tension and compression forces stay constant, while the lever arm varies according to the moment.Both tension and compression forces and the lever arm change simultaneously.Tension and compression forces as well as the lever arm remain constant.None of the above.

12.What is the nature of the hoop stress in a spherical dome when a concentrated load is applied at the crown?

Compressive throughout the entire domeTensile throughout the entire domeA combination of compressive and tensile stressesNo hoop stress is present

13.What forces should be considered when designing a beam that is curved in the horizontal plane?

Shear forces and bending momentsTorsional forces and bending momentsTorsion and shear forcesBending moments, shear forces, and torsion

14.What is the expected deflection behavior of a simply supported beam with reinforcement only at the bottom when subjected to shrinkage stresses?

bend downwardbend upwardbend either upward or downwardno deflection

15.According to Whitney’s theory, what is the formula for the maximum moment of resistance of a balanced beam section with width b and effective depth d?

^acybd2^acybd20.185acybd20.43acybd2

16.Based on Whitney's theory, what is the maximum depth of the stress block for a balanced reinforced concrete beam section?

0.43 times the effective depth (d)0.537 times the effective depth (d)0.68 times the effective depth (d)0.85 times the effective depth (d)None of the above

17.According to IS: 456-1978, what is the design yield stress value of steel expressed as a fraction of its characteristic yield strength?

0.37 times fy0.57 times fy0.67 times fy0.87 times fyNone of the above

18.Assertion (A): The load factor assigned to live loads is higher than that for dead loads. Reason (R): Live loads exhibit greater variability compared to dead loads. Evaluate the following statements:

Both A and R are true, and R correctly explains A.Both A and R are true, but R does not correctly explain A.A is true, but R is false.A is false, but R is true.Neither A nor R is true.

19.Based on Whitney's theory, what is the assumed ultimate strain value for concrete?

0.00030.0010.0030.03

20.What are the respective load factors assigned to live load and dead load?

1.5 for live load and 2.2 for dead load2.2 for live load and 1.5 for dead load1.5 for both live load and dead load2.2 for both live load and dead load

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