# Concrete Technology Questions and Answers – Flexural Strength of Concrete

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Flexural Strength of Concrete”.

1. What is flexural strength?
a) The stress value obtained when the peak load value is used in the equation of modulus of rupture
b) The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture
c) The load value representing the average load-carrying capacity in the post peak region up to a specified deflection of L/n
d) Value of the mean equivalent flexural strength normalized with respect to mean flexural strength

Explanation: The stress value obtained when the peak load value is used in the equation of modulus of rupture is called flexural strength.

2. What is equivalent flexural load?
a) The stress value obtained when the peak load value is used in the equation of modulus of rupture
b) The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture
c) The load value representing the average load-carrying capacity in the post peak region up to a specified deflection of L/n
d) Value of the mean equivalent flexural strength normalized with respect to mean flexural strength

Explanation: The load value representing the average load-carrying capacity in the post peak region up to a specified deflection of L/n is equivalent flexural load.

3. What is equivalent flexural strength?
a) The stress value obtained when the peak load value is used in the equation of modulus of rupture
b) The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture
c) The load value representing the average load-carrying capacity in the post peak region up to a specified deflection of L/n
d) Value of the mean equivalent flexural strength normalized with respect to mean flexural strength

Explanation: The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture is called equivalent flexural strength.

4. What is equivalent flexural strength ratio?
a) The stress value obtained when the peak load value is used in the equation of modulus of rupture
b) The stress value representing the average flexural strength in the post peak region up to a specified deflection of L/n obtained when Pe,n is used in the equation of modulus of rupture
c) The load value representing the average load-carrying capacity in the post peak region up to a specified deflection of L/n
d) Value of the mean equivalent flexural strength normalized with respect to mean flexural strength

Explanation: Equivalent flexural strength ratio is Value of the mean equivalent flexural strength normalized with respect to mean flexural strength.

5. Calipers, capable of reading the dimensions of test specimens to an accuracy of ____________
a) 1mm
b) .1mm
c) 10mm
d) .5mm

Explanation: Calipers, capable of reading the dimensions of test specimens to an accuracy of 0.1 mm.
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6. Rule (ruler/scale), capable of reading the dimensions of test specimens to an accuracy of ________
a) 1mm
b) .1mm
c) 10mm
d) .5mm

Explanation: Rule (ruler/scale), capable of reading the dimensions of test specimens to an accuracy of 1 mm.

7. Load measuring device shall be capable of measuring loads to an accuracy of ___________
a) 1N
b) 10N
c) 1KN
d) 10KN

Explanation: Load measuring device shall be capable of measuring loads to an accuracy of 10N.

8. The tolerances on the cross-section of the test specimens shall be within ± ____________
a) 1%
b) 2%
c) 3%
d) 5%

Explanation: The tolerances on the cross-section of the test specimens shall be within ± 2%.

9. The flexural strength (or modulus of rupture) is obtained for the first peak load, Pmax as _______________
a) Pmax * L/bd2
b) Pmax/Ld2
c) Pmax * L/bd
d) Pmax/L/bd2

Explanation: It should be noted that the value obtained may be significantly different from that obtained in a conventional test carried out under load control, where the specimen fails at the peak load.

10. A data acquisition system capable of digitally recording and storing load and deflection data at least ___________
a) 1 times per sec
b) 5 times per sec
c) 10 times per sec
d) 15 times per sec

Explanation: A data acquisition system capable of digitally recording and storing load and deflection data at least 10 times per second (i.e., a sampling frequency of 10 Hz is suitable.

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