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
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. Identify the type of destructive testing ______________
a) Radiographic test
b) Dye penetrant test
c) Creep test
d) Visual testing
Explanation: Creep test is a type of destructive test. It is defined as slow plastic deformation at high temperatures for a longer time under constant stresses. Creep occurs at room temperature and at high temperatures.
3. Which among the following is the last step in magnetic particle test method?
a) Observation and inspection
b) Circular magnetization
c) Demagnetization
d) Magnetization
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.
4. Which of the following statements is/are true for the 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
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. The waves travel in straight line and are reflected from metal gas interface or discontinuities in their patch.
5. Which test can be performed without skilled labour?
a) Probe test
b) Bend liquid test
c) Dye penetrant test
d) Torsion test
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 a low magnifying glass.
6. 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
Explanation: Nondestructive tests are applications for detecting flaws in materials without impairing their usefulness.
7. What is a destructive test?
a) Destructive tests are applications for detecting flaws in materials without impairing their usefulness
b) Destructive tests are applications for detecting flaws that impair the use of the materials such as pressure testing
c) Destructive tests are applications for detecting flaws in materials with impairing their usefulness
d) Destructive tests are applications for detecting flaws that do not impair the use of the materials such as pressure testing
Explanation: Destructive tests are applications for detecting flaws that impair the use of materials such as pressure testing.
8. An ultrasonic pulse velocity test is an _____________
a) Ex-situ, nondestructive test
b) In-situ, nondestructive test
c) Ex-situ, destructive test
d) In-situ, destructive test
Explanation: An ultrasonic pulse velocity test is an in-situ, nondestructive test to check the quality of concrete and natural rocks.
9. In this test, the strength and quality of concrete or rock is assessed by measuring the ___ of an ultrasonic pulse.
a) Length
b) Velocity
c) Weight
d) Surface Tension
Explanation: In this test, the strength and quality of concrete or rock is assessed by measuring the velocity of an ultrasonic pulse passing through a concrete structure or natural rock formation.
10. Higher velocities indicate __________
a) Good quality and continuity of the material
b) Bad quality and continuity of the material
c) Concrete with many cracks
d) Concrete with many voids
Explanation: Higher velocities indicate good quality and continuity of the material, while slower velocities may indicate concrete with many cracks or voids.