Metallurgical Engineering MCQs


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
Answer & Explanation Answer: B) 0.01 to 10 nanometers

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.

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The amount of absorption of rays depends on the density and thickness of the material.

A) True B) False
Answer & Explanation Answer: A) True

Explanation: Radiation is absorbed inside material based on thickness and density. Hence defects based on density variation are detected.

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Planar defects can’t be detected by radiography.

A) True B) False
Answer & Explanation Answer: B) False

Explanation: Radiographic inspection is mainly used for internal defect detection. Planer defects can also be detected by proper orientation.

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Radiography don’t give ________

A) Thickness of material B) Hardness
C) Blow holes in casting D) Pores in weldment
Answer & Explanation Answer: B) Hardness

Explanation: Radiography is used for detecting internal defects mainly. Blow holes, voids and porosity are best examples.

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________ produce light area on film.

A) Inclusions B) Pores
C) Voids D) Blow holes
Answer & Explanation Answer: A) Inclusions

Explanation: Inclusions are denser than the surrounding material. These absorb more radiation than lower density areas. It hence produces light area on film.

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The film in radiographic inspection is called __________

A) Plate B) Radiograph
C) Micrograph D) X-ray sheet
Answer & Explanation Answer: B) Radiograph

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.

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The dark areas represent an object with ________

A) Lower density B) High density
C) Porosity D) Grain boundaries
Answer & Explanation Answer: A) Lower density

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.

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Radiographic inspection use _________

A) Sound waves B) AC
C) X-rays D) Visible light
Answer & Explanation Answer: C) X-rays

Explanation: Radiographic inspection use very short wavelength electromagnetic radiations. These are X-rays and ϒ-rays.

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