Non-Destructive Testing: 50′ Questions for Conduct of Examinations at NDT RT Levels-1

Radiographic Testing Level -1 (RT-1) General Examination Part-1

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RT Level 1 :: NDT Mock Test Practice Quiz MCQ’s Part-1

1.

X-ray intensity is a function of :

 (a) Cathode current

 (b) Step down ratio of the filament transformer

 (c) The distance from the test piece

 (d) Size of the anode (target)

2.

A straight, dark line in the center of the film of a weld cap would probably be:

 (a) Porosity

 (b) Undercut

 (c) Tungsten inclusions

 (d) A linear crack

3.

Film intensifying screens are normally used to:

 (a) Decrease exposure time

 (b) Increase grain size

 (c) Shield film from stray light

 (d) All of the above

4.

Which of the following types of radiation is particulate?

 (a) X

 (b) Gamma

 (c) Alpha

 (d) None of the above

5.

One half-value layer of lead for Cobalt-60 is approximate:

 (a) 12 mm

 (b) 6 mm

 (c) 2 mm

 (d) 25 mm

6.

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Which type of film would exhibit the coarsest grain?

 (a) Slow

 (b) Medium

 (c) Fast

 (d) No difference in the grain sizes

7.

One half-value layer of lead for Iridium-192 is approximate:

 (a) 12 mm

 (b) 4 mm

 (c) 2 mm

 (d) 25 mm

8.

Most scattered radiation which adversely affects the radiographic image quality originates:

 (a) From floors and walls adjacent to the test piece

 (b) From other nearby objects

 (c) From the test piece itself

 (d) From the lead intensifying screens

9.

The film processing step in which the undeveloped silver bromide is removed from the film emulsion is called:

 (a) Development

 (b) Stop bath

 (c) Fixing

 (d) Rinsing

10.

Radiographic enlargement to distinguish small defects is possible:

 (a) Only with a very small source or focal spot size radiation source

 (b) Routinely

 (c) With most sources

 (d) Never

11.

Which of the following types of intensifying screens are not used in industrial radiography?

 (a) Lead

 (b) Fluorescent

 (c) Silver halide

 (d) All of the above

12.

The intensifying action of lead screens is caused by:

 (a) Secondary X-ray emission

 (b) Secondary gamma-ray emissions

 (c) Fluorescence of lead screens

 (d) Electron emission

13.

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X rays are produced by:

 (a) Radioactive isotopes

 (b) The rapid deceleration of electrons

 (c) Ultraviolet radiation of unstable atoms

 (d) All of the above

14.

Radiography of tubular sections using a double-wall, double viewing technique is mainly applicable to sections:

 (a) Over 38 mm in diameter

 (b) 88 mm in diameter or less

 (c) 125 mm in diameter and less

 (d) Under 25 mm in diameter

15.

Another name for a penetrameter is:

 (a) Radiographic shim

 (b) Image quality indicator

 (c) Density standard

 (d) Acceptance standard

16.

A silver nitrate spot test might be used to:

 (a) Check for archival film quality

 (b) Check for out of date film

 (c) Check for single versus double emulsion film

 (d) Any of the above

17.

What is the most important factor in determining the archival quality of the radiographic film?

 (a) Film density

 (b) Image quality

 (c) Degree of removal of fixer residues during washing

 (d) Degree of removal of developer residues during washing

18.

Most of the energy applied to an X-ray tube is converted into:

 (a) X rays

 (b) Light

 (c) Heat

 (d) Ultraviolet radiation

19.

The main advantage of having a small focal spot on an X-ray tube is:

 (a) Heat is conducted away more efficiently than with a large focal spot

 (b) A smaller focal spot is unlikely to be damaged from the required tube currents

 (c) Longer tube life

 (d) A smaller focal spot allows sharper radiographic images than does a larger focal spot

20.

The normal range of steel that is radiographed using Ir-192 is:

21.

Which of the following is the most common method of packaging film?

22.

The penetrating power of an X-ray machine is indicated by:

 (a) Milliamperage

 (b) Tube voltage

 (c) Filament current

 (d) Anode current

23.

The focal spot size of an X-ray machine must be known in order to determine:

 (a) The geometric unsharpness

 (b) Kilovoltage peak output

 (c) Required mA setting

 (d) Exposure time

24.

Which of the following is a function of lead screens?

 (a) To reduce geometric unsharpness

 (b) To increase scatter

 (c) To reduce exposure time

 (d) All of the above

25.

Which of the following viewing conditions is most desirable for interpreting radiographic film?

 (a) Brightness of surroundings approximately the same as the area of interest on the radiograph

 (b) Totally dark viewing room

 (c) Well lit viewing room

 (d) None of the above

26.

Pinhole radiography would be used to:

 (a) Make high-quality radiographs for critical inspection

 (b) Determine focal spot size

 (c) Construct exposure charts

 (d) None of the above

27.

Approximately what energy X-ray machine would be required to have penetrating power equivalent to a Cobalt-60 source:

 (a) 600 keV

 (b) 1.2 MeV

 (c) 2 MeV

 (d) None of the above

28.

Higher X ray tube voltages result in:

 (a) Shorter wavelengths X rays

 (b) Less penetrating X rays

 (c) Fewer X rays in the primary beam

 (d) All of the above

29.

A radiation producing device that emits radiation of one or a few discreet wavelengths is:

 (a) An X-ray machine

 (b) A linear accelerator

 (c) A gamma-ray source

 (d) A betatron

30.

A linear accelerator is used to produce X rays having energy in the range of:

 (a) Several MeV

 (b) 50-500 keV

 (c) 500-1000 keV

 (d) 0-50 keV

31.

An effect of scattered radiation is to:

 (a) Decrease required exposure time

 (b) Diminish contrast, detail, and clarity of the radiographic image.

 (c) Decrease film density

 (d) All of the above

32.

A densitometer is an instrument that measures:

 (a) Radiographic contrast

 (b) Radiographic sensitivity

 (c) Radiographic density

 (d) Radiographic resolution

33.

An advantage of a gamma-ray source is:

 (a) Radiation may be turned on or off at will

 (b) Outside power is normally not required

 (c) Less shielding is required than for X-ray

 (d) All of the above

34.

For a particular isotope, the gamma radiation intensity is determined by:

 (a) Type of isotope used

 (b) Energy level of gamma rays in source

 (c) Source strength in curies

 (d) None of the above

35.

The silver nitrate spot test can be used to:

 (a) Check the film for film quality

 (b) Check for underdeveloped films

 (c) Check for film artifacts

 (d) All the above answers are correct

36.

How is the wavelength of scattered radiation compared to the primary beam?

 (a) Longer than the wavelength of the primary beam

 (b) Shorter than the wavelength of the primary beam

 (c) Same as the wavelength of the primary beam

 (d) Not related

37.

Betatrons are used to produce X rays in what range?

 (a) Several MeV

 (b) 50-500 keV

 (c) 500-1000 keV

 (d) 0-50 keV

38.

Which of the following statements should be true to achieve the highest level of radiographic sharpness (definition)?

 (a) The focal spot should be as small as practicable

 (b) The focal spot to test piece distance should be as large as practicable

 (c) The film to test piece distance should be as small as practicable

 (d) All of the above

39.

48 Which of the following is the correct formula to use for calculating geometric unsharpness if F=source size, T=specimen thickness, D=source to object distance and Ug =geometric unsharpness:

 (a)Ug= FD/T

 (b)Ug= DT/F

 (c)Ug= FT/D

 (d)Ug= FTD

40.

What is the minimum age in years at which a person may perform radiography :

 (a) 15

 (b) 18

 (c) 21

 (d) 30

41.

Which one of the following steps is necessary to dissolve the undarkened silver salt crystals in the film emulsion:

 (a) Developing

 (b) Fixing

 (c) Washing

 (d) None of the above

42.

Reticulation may be the result of:

 (a) Inadequate agitation of the film during development

 (b) Inadequate water rinse during processing

 (c) Using exhausted stop bath solution

 (d) Developing solutions not maintained at the same temperatures

43.

Thicker materials would normally be inspected using:

 (a) Lower kV X rays

 (b) Higher mA X rays

 (c) Higher kV X rays

 (d) Lower mA X rays

44.

Cobalt-60 is produced by:

 (a) Fission of Uranium-235

 (b) Neutron capture by Cobalt-59

 (c) Radioactive decay

 (d) None of the above

45.

Which of the following correctly expresses the inverse square law if I1=dose rate nearest source, I2 =dose rate furthest from the source, D1=distance nearest to source and D2=distance furthest from the source:

 A. I1/I2 = D12 /D22

 B. I12 / I22 = D1/D2

 C. I1/I2 = D22 /D12

 D. I12 / I22 = D2 /D1

46.

A detrimental effect of fluorescent screens might be:

 (a) High definition

 (b) Screen mottle

 (c) Non-linear attenuation

 (d) Displaced core effect

47.

Which of the following is an isotope not artificially produced for industrial use:

 (a) Ir-192

 (b) Ra-226

 (c) Co-60

 (d) All of the above

48.

A wetting agent is used in film processing to

 (a) More closely control development

 (b) Prevent formation of watermarks during the drying stage

 (c) Reduce the formation of air bubbles in the developer solution

 (d) Reduce the formation of air bubbles in the fixer

49.

A casting flaw which is formed when two masses of molten metal flowing from different directions flow together but fail to fuse is called:

 (a) A hot tear

 (b) Shrinkage

 (c) A cold crack

 (d) A cold shut

50.

The difference in densities seen on a radiograph due to section changes in an item is:

 (a) Film contrast

 (b) Radiographic contrast

 (c) Subject contrast

 (d) Radiographic sensitivity

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