This set of Repair and Rehabilitation of Structures Multiple Choice Questions & Answers (MCQs) focuses on “Causes of Distress and Deterioration of Concrete – Set 2”.
1. Non Destructive Testing (NDT) plays a major role in determining the various relative properties of concrete.
a) True
b) False
View Answer
Explanation: Non Destructive Testing (NDT) plays a major role in determining the various relative properties of concrete such as modulus of elasticity, homogeneity and strength of concrete. And these techniques want expertise to interpret accurate data.
2. Which of the following checks are done in the Petrographic examination?
a) Density
b) Compressive strength
c) Pulse velocity
d) Aggregate condition
View Answer
Explanation: Aggregate condition is one of the checks done in Petrographic condition. And Petrographic test examinations are branch of Geology that deals with the classification of rock.
3. Which of the following if the elements that are looked for during physical testing?
a) Denseness of cement paste
b) Homogeneity of cement paste
c) Depth and extension of carbonation
d) Poisson’s ratio
View Answer
Explanation: Physical analysis is often done on core samples and the main element that is analyzed during the testing is the Poisson’s ratio of the sample that is tested.
4. Which of the following influences the rebound hammer test?
a) Smoothness of the concrete
b) Presence of contaminating substance
c) Occurrence of fracture
d) Depth of carbonation
View Answer
Explanation: Smoothness of the concrete structure is one of the major factors that influences the results of rebound hammer test as the hammer directly comes in contact with the surface of the concrete that is to be tested.
5. Chemical analysis is a part of determining the qualities of concrete.
a) True.
b) False
View Answer
Explanation: Chemical analysis is a part of determining the qualities of concrete such as the presence and amount of chloride, sulfide and other admixtures that are present in the concrete.
6. Low velocity in ultrasonic pulse velocity testing indicates ______________
a) good concrete
b) fairly good concrete
c) poor concrete
d) very poor concrete
View Answer
Explanation: Ultrasonic pulse velocity testing is the fast means to test concrete these days and is the most important testing in NDT. Velocities are passed to test the strength of concrete and low velocity indicates poor concrete.
7. __________ provides a comprehensive evaluation of top surface wear of concrete.
a) Visual inspection
b) Petrographic examination
c) Acoustic mapping
d) Joint inspection
View Answer
Explanation: Acoustic mapping provides a comprehensive evaluation of top surface wear of concrete and fast inspections in under water can be done with this system of mapping.
8. The fast and simple way to test concrete using NDT is Rebound Hammer.
a) True
b) False
View Answer
Explanation: Rebound hammer is a fast and simple way to test concrete in NDT. It cannot give precise results when compared with other non destructive testing’s. But still, the easiness in handling this instrument makes it a simple way of testing.
9. Ultra sonic pulse echo testing is good for flat surfaces.
a) True
b) False
View Answer
Explanation: Ultra sonic pulse echo testing is good for flat surfaces and are able to detect steel and concrete pipes that are embedded beneath the concrete surfaces.
10. The other consideration during the evaluation of concrete include ________
a) pulse velocity
b) friction sliding
c) air content
d) stability analysis
View Answer
Explanation: The other consideration during the evaluation of concrete includes the stability analysis which is more impotent for the durability of concrete.
11. Radar is the growing element in concrete evaluation.
a) True
b) False
View Answer
Explanation: Radar doesn’t require any contact with concrete during testing but still the resolution in radar is limited and so it is considered as the growing element in concrete evolution.
12. Spiral reinforcement for any cat in place concrete must not be less than ___________ inch in diameter.
a) 3/8
b) 4/5
c) 3/4
d) 1/2
View Answer
Explanation: Spiral reinforcement for any cat in place concrete must not be less than 3/8 inch in diameter to ensure the bonding of the concrete.
Sanfoundry Global Education & Learning Series – Repair and Rehabilitation of Structures.
To practice all areas of Repair and Rehabilitation of Structures, here is complete set of Multiple Choice Questions and Answers.
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