Radiography Test Question Answers NDT CSWIP Course RT Welding

Keywords for this article are Radiography Test Question Answers NDT CSWIP Course RT Welding. Weld Radiography. Radio test for welding. RT welding. Radiography test pipe welding.

Radiography Test Question Answers NDT CSWIP Course RT Welding

1. Which of the following particles holds a positive charge:

1. protons
2. neutrons
3. electrons
4. photon

 

2. Very short wavelength radiation produced when electrons travelling at high speeds collide with matter is called:

1. X- radiation
2. Beta radiation
3. Alpha radiation
4. Delta radiation

 

3. X and gamma radiation always travel :

1. In pairs
2. In orbital spheres
3. In straight lines
4. None of the above

 

4. Atoms or molecules carrying either a positive or negative charge are called:

1. photoelectrons
2. elements
3. ions
4. compounds

 

5. Gamma and X radiation may interact with matter and be absorbed by:

1. Photoelectric absorption
2. Compton scattering
3. Pair production
4. All of the above

 

6. The absorption of radiation by a material varies:

1. Directly with the square of the distance from the source
2. Directly with the thickness of the material
3. Inversely with the amount of scattering
4. In an approximately exponential manner with the thickness of the material

 

 

7. Which of the following is an example of electromagnetic radiation

1. X-rays
2. Ultraviolet light
3. Microwaves
4. All of the above are electromagnetic

 

8. A fluorescent intensifying screen will:

a          transform X-ray energy into visible or ultraviolet light to which a photographic emulsion is sensitive

b          result in reticulation

c          decrease the graininess of the image when using gamma rays

d          increase the definition in a radiograph

 

9. X, gamma and alpha radiation all have one thing in common , they are all

1. particulate radiation
2. electromagnetic radiation
3. microwave radiation
4. ionising radiation

 

10. Short wavelength radiation formed during the disintegration of nuclei of    radioactive substances is called :

1. X radiation
2. Gamma radiation
3. Scatter
4. Electromagnetism

 

11. Which of the following is an example of electromagnetic radiation

1. X-rays
2. Ultraviolet light
3. Microwaves
4.         All of the above are electromagnetic

 

12. An excellent radiograph is obtained under given conditions of exposure with the film located at a distance of 36 inches from the target of the X-ray tube.  If the                 film is now placed only 18 inches from the target, and all exposure conditions                  except time are held constant, the new exposure time will be:

1. unchanged
2. longer by approximately 80 per cent
3. shorter by approximately 55 per cent
4. only about 25 per cent as long as the original exposure time

 

13. In X radiography the ability to penetrate is governed by

1. Source to film distance
2. Amperage
3. Kilovoltage
4. Time

 

14. The number of positive charges on the nucleus of an atom equals :

1. The number of neutrons
2. The number of photons
3. The atomic number
4. The atomic weight

 

15. In X radiography the ability to penetrate is governed by

1. Source to film distance
2. Amperage
3. Kilovoltage
4. Time

 

16. Upon completing an X-ray exposure and turning of the equipment

1. Personnel should wait for a few minutes before entering the area
2. Personnel should wear lead lined clothing when entering the area
3. Personnel can enter the area without fear of radiation exposure
4. Personnel should take a reading with a survey meter before entering the exposure area

 

17. X-ray tube current is controlled by :

1. The current passing through the filament
2. The distance from the cathode to the anode
3. The type of material in the target
4. The voltage and waveform applied to the X-ray tube

 

18. As the kilovoltage applied to the X-ray tube is raised

1. X-rays of longer wavelength and more penetrating power are produced
2. X-rays of shorter wavelength and more penetrating power are produced
3. X-rays of shorter wavelength and less penetrating power are produced
4. X-rays of longer wavelength and less penetrating power are produced

 

19. X-ray exposure of personnel may be due to :

1. The direct beam from the X-ray tube
2. Scattered radiation arising from objects in the direct beam
3. Both a and b
4. Both a and b plus residual radiation that exists once the X-ray machine has been turned off 

20. Lead is frequently employed in shielding against radiation from X-ray and gamma ray sources because of its:

1. extremely low cost
2. high absorption for a given thickness and weight
3. ability to emit electrons when irradiated
4. ability to diffract alpha particles

21. The penetration ability of an X-ray beam is governed by:

1. kilovoltage or wavelength
2. time
3. milliamperage
4. source-to-film distance

22. A fluorescent intensifying screen will:

a          transform X-ray energy into visible or ultraviolet light to which a photographic emulsion is sensitive

b          result in reticulation

c          decrease the graininess of the image when using gamma rays

d          increase the definition in a radiograph

 

23. When producing radiographs an increase in kilovoltage will result in

1. A reduction in contrast
2. An increase in contrast
3. A reduction in density
4. A reduction in definition

 

24. The most common source of electrons in high vacuum X-ray tubes is :

1. Reflection from the anode
2. The heated anode
3. The heated cathode
4. The target

 

25. In choosing the target material the principal properties to be considered are all but which of the following

1. High atomic number
2. High melting point
3. High thermal conductivity
4. High vapour pressure

 

26. Which of the following is the major factor affecting the duty cycle of X-ray    equipment

1. The kV rating
2. The thickness of the item being radiographed
3. The rate of cooling of the anode
4. The size of the focal spot

 

27. Which of the following would not offer a degree of protection against radiation :

1. Increased distance away from the source of radiation
2. Placing material such as lead between oneself and the source of radiation
3.       Wearing a film badge
4. Minimising the length of time one is being exposed to radiation.

28. Fluoroscopy differs from radiography in that :

1. It uses a much lower kilovoltage
2. It is much more sensitive
3. It permits the examination of thicker parts
4. The image is observed visually on a fluorescent screen rather than recorded on a film

29. The number of electrons striking the target in an X-ray tube is a function of:

1. the atomic number of the cathode material
2. the atomic number of the filament material
3. the voltage difference between the cathode and anode
4. the current flow

 

30. The primary form of energy conversion when electrons strike a target in an X-ray tube results in the production of:

1. primary X-rays
2. secondary X-rays
3. short wavelength X-rays
4. heat

 

31. X-rays, gamma rays and alpha particles are all:

1. Particulate radiation

1. Electromagnetic radiation
2. Microwave radiation
3. Ionising radiation

 

32. In radiography, penetrameters are usually placed:

1. Between the intensifying screen and the film
2. On the source side of the test object
3. On the film side of the test object
4. Between the operator and the radiation source

 

33. The velocity of electrons striking the target in an X-ray tube is a function of:

1. The atomic number of the cathode material
2. The atomic number of the filament material
3. The voltage difference between the cathode and anode
4. The current flow in the rectifier circuit

 

34. A fluorescent intensifying screen will:

A         transform X-ray energy into visible or ultraviolet light to which a photographic emulsion is sensitive

B         result in reticulation

C         decrease the graininess of the image when using gamma rays

D         increase the definition in a radiograph

 

35. In an X-ray tube, the filament and focusing cup are the two essential parts of the:

1. Anode
2. Cathode
3. Rectifier
4. X-ray transformer

 

36. Materials which are exposed to gamma or X-rays below a few million volts:

1. Should not be handled for at least 3 minutes after exposure has ceased.
2. Should be stored in a lead-lined room
3. Will not be dangerous to handle after exposure to radiation has ceased
4. Should be monitored by means of a Geiger counter.

37. The duration of an exposure is usually controlled by:

1. Controlling the milliamperage
2. A timer
3. Controlling the course-to-film distance
4. A choke coil in the filament transformer

 

38. In order to increase the intensity of X-rays we should:

1. Increase the tube current
2. Increase the tube voltage
3. Decrease the tube voltage
4. Move the specimen away from the film

 

39. A beam of radiation consisting of radiation of a single wavelength is known as

1. Characteristic
2. Fluoroscopic
3. monochromatic
4. microscopic

 

40. Diffraction mottling can be reduced and often eliminated by :

1. Raising the amperage
2. Raising the kilovoltage
3. Using lead screens
4. All of the above would be required

Keywords for this article are Radiography Test Question Answers NDT CSWIP Course RT Welding. Weld Radiography. Radio test for welding. RT welding. Radiography test pipe welding.

Specific Radiography

1. As a check on the adequacy of the radiographic technique, it is customary to place a standard test piece on the source side of the specimen.  This standard test piece is called a:

1. reference plate
2. lead screen
3. penetrameter
4. illuminator 

2. The ability to detect a small discontinuity or flaw is called:

1. radiographic contrast
2. radiographic sensitivity
3. radiographic density
4. radiographic resolution

 

3. Movement, geometry and screen contact are three factors that affect    radiographic:

1. contrast
2. unsharpness
3. reticulation
4. density

 

4. The difference between the densities of two areas of a radiograph is called:

1. Radiographic contrast
2. subject contrast
3. film contrast
4. definition

 

5. The sharpness of the outline in the image of the radiograph is a measure of:

1. subject contrast
2. radiographic definition
3. radiographic contrast
4. film contrast

6. Fluoroscopy differs from radiography in that :

1. It uses a much lower kilovoltage
2. It is much more sensitive
3. It permits the examination of thicker parts
4. The image is observed visually on a fluorescent screen rather than recorded on a film

7. In radiography, penetrameters are usually placed:

1. between the intensifying screen and the film
2. on the source side of the test object
3. on the film side of the test object
4. between the operator and the radiation source

 

8. A penetrameter is used to measure:

a          the size of discontinuities in a part

b          the density of the film

c          the amount of film contrast

d          the quality of the radiographic technique

 

9. Cavities in a casting are produced by:

1. chills
2. chaplets
3. cores
4. vents

 

10. Uneven cooling rates between sections of varying cross-section within a casting can be equalised by the use of:

1. chills
2. chaplets
3. cores
4. vents

 

11. A lack of fusion defect resulting from an interruption in the pairing process during the casting process is:-

1. hot tear
2. chaplet
3. unfused chill
4. cold shut

 

12. Which of the following casting defects is most likely to occur at the change of section:-

1. Hot tear
2. Unfused chaplet
3. Porosity
4. Shrinkage

 

13. What would be the IQI sensitivity if the thinnest wire visible on an item of 15 mm thick item is 0.2mm 

1. 33%
2. 6%
3. 9%
4. None of the above

 

14. The sharpness of the outline in the image of the radiograph is a measure of:

1. subject contrast
2. radiographic definition
3. radiographic contrast
4. film contrast

 

15. Accidental movement of the specimen or film during exposure or the use of too small an FFD will:

A         produce a radiograph with poor contrast

B         make it impossible to detect large discontinuities

C         result in unsharpness of the radiograph

D         result in a fogged radiograph

 

16. A general rule governing the application of the geometric principles of shadow formation states that:

1. The X-rays should proceed from as large a focal spot as other consideration will allow
2. The distance between the radiation source and the material examined should be as small as practical
3. The film should be as far as possible from the object being radiographed
4. The central ray should be as nearly perpendicular to the film as possible, to preserve spatial relationships.

 

17. If an exposure time of 60 seconds was necessary using a 4 foot source-to-film distance for a particular exposure, what time would be necessary if a 2 foot           source-to-film distance is used and all other variables remain the same?

1. 120 seconds
2. 30 seconds
3. 15 seconds
4. 240 seconds

 

18. The focal spot in an X-ray tube:

1. Is inclined at an angle of 30 from the normal to the tube axis
2. Is maintained at a high negative voltage during operations
3. Should be as large as possible to ensure a narrow beam of primary radiation
4. Should be as small as possible without unduly shortening the life of a tube.

 

19. A graph showing the relationship between material thickness, kilovoltage and exposure times is called:

1. A characteristic curve
2. An H&D curve
3. An exposure chart
4. A technique sheet

 

20. Hot tears, cold shuts and blowholes are defects typically found in what form of product

1. Weld
2. Forging
3. Extension
4. Casting

Keywords for this article are Radiography Test Question Answers NDT CSWIP Course RT Welding. Weld Radiography. Radio test for welding. RT welding. Radiography test pipe welding.