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. ?-rays have a wavelength less than 10 picometers.

View Answer Discuss


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.

View Answer Discuss


Planar defects canít 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.

View Answer Discuss


Radiography donít 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.

View Answer Discuss


________ 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.

View Answer Discuss


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.

View Answer Discuss


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.

View Answer Discuss


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 ?-rays.

View Answer Discuss