Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. If an exposure time of 60 seconds and source to film distance of 365.7 m (1200 feet) is necessary for a particular exposure, what exposure time would be needed for an equivalent exposure if the source- to-film distance is changed to 457.2 m (1500 feet)?
a. 75 seconds
b. 94 seconds
c. 48 seconds
d. 38 seconds
Q. Subject contrast and film contrast are the two factors that comprise radiographic:
a. Definition
b. Distortion
c. Contrast
d. Graininess
Q. ‘Film contrast’ is the inherent ability of a film to show for agiven change in film exposure.
a. No appreciable change in density
b. Graininess
c. A difference in density
d. No graininess
Q. The range of the specimen thickness that can be adequately recorded on a radiographis known as the of the radiograph.
a. Sensitivity
b. Latitude
c. Accuracy
d. Intensity
Q. Source-to-object distance, object-to-film distance, and source size are the three factorsthat control the of the radiograph.
a. Density
b. Exposure
c. Film size
d. Unsharpness
Q. The ‘multi-film’ technique may be used when one radiograph film does not haveenough to produce a satisfactory radiograph of a specimen.
a. Latitude
b. Definition
c. Graininess
d. Activity
Q. What governs the penetrating power of an X ray beam?
a. Kilovoltage
b. Time
c. Activity
d. Milliamperage
Q. The shorter the wavelength of X or gamma rays:
a. The higher their energy
b. The faster they travel
c. The smaller their penetrating power
d. The closer they are to becoming radio waves
Q. A large source size can be compensated for by:
a. Increasing source-to-specimen distance
b. Addition of lead screens
c. Increasing specimen-to-film distance
d. Increasing penumbra
Q. The maximum film density to which the radiograph should be exposed is dependent upon:
a. The quality of the film viewer
b. The variation in thickness of the specimen
c. The speed of the film
d. The graininess of the film
Q. The selection of the proper source-to-film distance is a primary factor in controlling:
a. Contrast
b. Unsharpness
c. Graininess
d. Scatter
Q. When the penumbra on a radiograph measures less than 0.5 mm (0.020 inches), theimage will appear to unaided eye of the film interpreter as:
a. Fuzzy
b. Sharp
c. Distorted
d. Dark
Q. Two X ray machines operating at same nominal kilovoltage and milliamperagesettings:
a. Will produce the same intensities and energies of radiation
b. Will produce the same intensities but produce different energies of radiation
c. Will produce the same energies but may produce different intensities of radiation
d. May give not only different intensities, but also different energies of radiation
Q. The fact that gases, when bombarded by radiation, ionise and become electricalconductors make them useful in:
a. X ray transformers
b. X ray tubes
c. Masks
d. Radiation detection equipment
Q. A weld discontinuity which consists of unmelted joint surfaces at the root, and whichmay be caused by poor fit-up, is called:
a. Hot short cracking
b. A slag inclusion
c. Incomplete penetration
d. Burn through