This set of Testing of Materials Multiple Choice Questions & Answers (MCQs) focuses on “Radiographic Inspection”.
1. Radiographic inspection use _________
a) Sound waves
b) AC
c) X-rays
d) Visible light
View Answer
Explanation: Radiographic inspection use very short wavelength electromagnetic radiations. These are X-rays and ϒ-rays.
2. The dark areas represent an object with ________
a) Lower density
b) High density
c) Porosity
d) Grain boundaries
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Explanation: The dark areas represent an object with lower density. This is because of less absorption of radiation. These parts may be porosity or voids.
3. The film in radiographic inspection is called __________
a) Plate
b) Radiograph
c) Micrograph
d) X-ray sheet
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Explanation: A photographic film is used on the other side of object. It is known as the radiograph. It is called xerograph if film is exposed to x-ray radiation.
4. ________ produce light area on film.
a) Inclusions
b) Pores
c) Voids
d) Blow holes
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Explanation: Inclusions are denser than the surrounding material. These absorb more radiation than lower density areas. It hence produces light area on film.
5. Radiography don’t give ________
a) Thickness of material
b) Hardness
c) Blow holes in casting
d) Pores in weldment
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Explanation: Radiography is used for detecting internal defects mainly. Blow holes, voids and porosity are best examples.
6. Planar defects can’t be detected by radiography.
a) True
b) False
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Explanation: Radiographic inspection is mainly used for internal defect detection. Planer defects can also be detected by proper orientation.
7. The amount of absorption of rays depends on the density and thickness of the material.
a) True
b) False
View Answer
Explanation: Radiation is absorbed inside material based on thickness and density. Hence defects based on density variation are detected.
8. What is the wavelength of X-rays?
a) 10 picometers
b) 0.01 to 10 nanometers
c) 10 to 400 nanometers
d) 400 to 700 nanometers
View Answer
Explanation: X-rays are electromagnetic waves. These have a wavelength in range 0.01 to 10 nanometers. ϒ-rays have a wavelength less than 10 picometers.
Sanfoundry Global Education & Learning Series – Mechanical Behaviour & Testing of Materials.
To practice all areas of Mechanical Behaviour & Testing of Materials, here is complete set of 1000+ Multiple Choice Questions and Answers.