This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Non Destructive Testing”.
1. Which among the following is not a type of Non-destructive testing?
a) Compression test
b) Visual testing
c) Ultrasonic testing
d) Eddy current testing
View Answer
Explanation: Compression test is a type of destructive testing. This test is used to determine behavior of metals under compressive load. Visual testing, ultrasonic testing, eddy current testing are types of non-destructive testing.
2. What is nondestructive test?
a) Nondestructive tests are applications for detecting flaws in materials without impairing their usefulness
b) Nondestructive tests are applications for detecting flaws that impair the use of the materials such as pressure testing
c) Nondestructive tests are applications for detecting flaws in materials with impairing their usefulness
d) Nondestructive tests are applications for detecting flaws that do not impair the use of the materials such as pressure testing
View Answer
Explanation: Nondestructive tests are applications for detecting flaws in materials without impairing their usefulness.
3. Which test is used to determine dimensions of any object?
a) Ultrasonic test
b) Torsion test
c) Eddy current test
d) Compression test
View Answer
Explanation: Eddy current test is used to determine dimensions of objects, to detect cracks. An eddy current instrument consists of a probe or coil, an electronic unit for generating frequency and a CRT unit for display purpose.
4. During radiography test, which region absorbs less radiation and transmits more?
a) Low and high density regions absorb and transmit same amount of radiation
b) High density region
c) Low density region
d) Low and high density regions adsorb
View Answer
Explanation: This method uses short wavelength electromagnetic radiations such as X-rays and γ rays to detect internal defects. In this method the component to be tested is placed in path of radiations caused due to X-rays or γ rays.
5. Which of the following statements is/are true for ultrasonic test?
a) Equipment used for ultrasonic testing is portable
b) Complicated shapes can be easily scanned
c) Waves generated are health hazardous
d) Waves generated are health hazardous and complicated shapes can be easily scanned
View Answer
Explanation: Ultrasonic test uses sound waves of high frequency to detect discontinuities. This method is used to detect flaws on the surface and also deep inside the component.
6. Which among the following is the last step in magnetic particle test method?
a) Observation and inspection
b) Circular magnetization
c) Demagnetization
d) Magnetization
View Answer
Explanation: Different steps involved in magnetic particle test are cleaning the surface, magnetizing the metallic component, application of ferromagnetic powder, observation and inspection and demagnetization.
7. In which type of test the capillary action principle is used?
a) Probe test
b) Bend liquid test
c) Dye penetrant test
d) Torsion test
View Answer
Explanation: Dye penetrant test uses the capillary action principle to detect surface discontinuities. In this method liquid is applied on a metallic surface and it gets entered into cracks which are open.
8. Which test can be performed without skilled labour?
a) Probe test
b) Bend liquid test
c) Dye penetrant test
d) Torsion test
View Answer
Explanation: Dye penetrant test does not require any skilled labour. This method only detects surface discontinuities and this test needs to be observed with naked eyes or with low magnifying glass.
9. What is the first step involved in the process of preparation of test sample of material?
a) Rough polishing
b) Fine grinding
c) Fine polishing
d) Etching
View Answer
Explanation: Fine grinding involves grinding of material using silicon carbide as the first step in the process of preparation of test sample.
10. Which of the following compound is used for fine polishing?
a) Aluminum oxide
b) Nitric oxide
c) Silicon carbide
d) Iron oxide
View Answer
Explanation: Powder form of aluminum oxide is used for fine polishing process. It is surface treatment process.
Sanfoundry Global Education & Learning Series – Concrete Technology.
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