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mock test 90 quest
mock test 90 questions
| Question | Answer |
|---|---|
| Full-wave rectification uses: | Four silicon-based semiconductors |
| As the angle of the anode decreases, the: | Effective focal spot decreases |
| Which of the following grid errors will result in an image that shows normal density in the middle but decreased density on the sides and may follow removal and replacement of the grid? | Upside down |
| When a quality control test for accuracy of kVp is performed, the result must be within this amount of the control panel setting: | 4 |
| Energy in a CR imaging plate is released after exposure to: | laser beam |
| According to the anode heel effect, the intensity of radiation is greater at the ________ side of the x-ray tube. | cathode |
| The smallest particle of a compound that retains the characteristics of the compound is a(n): | molecule |
| In computed radiography, each pixel corresponds to a shade of gray representing an area in the patient known as a(n): | voxel |
| An x-ray machine that makes maximum use of heat loading potential uses a(n): | Falling load generator |
| The accuracy of kVp at 80 kVp must be: | No lower than 76 kVp and no higher than 84 kVp |
| The accuracy of collimation at a 60-inch SID must be: | ±1.2 inches |
| The smallest particle of an element that retains the characteristics of the element is a(n): | atom |
| The transformer that operates on the principle of self-induction is the: | autotransformer |
| X-ray beam quality is expressed in terms of: | half value layer |
| When a quality control test is performed to ensure that the collimator is providing appropriate radiation protection, the result must be within this amount: | 2% |
| In digital fluoroscopy and computed radiography, the energy must be changed to digital form by a(n): | Analog-to-digital converter |
| Thermionic emission occurs at the: | cathode |
| An x-ray machine that cannot provide long exposure times such as those required for autotomography uses a(n): | falling load generator |
| Grid frequency is described as the: | Number of lead strips per inch or centimeter |
| .The accuracy of kVp at 90 kVp must be: | No lower than 86 kVp and no higher than 94 kVp |
| The height of a sine wave is called: | amplitude |
| the result of thermionic emission is a | electron cloud |
| The accuracy of collimation at a 72-inch SID must be: | ±1.44 inches |
| Devices in the x-ray circuit that operate on the principle of mutual induction are called: | transformers |
| The feature of the image intensifier that ensures the radiation dose striking the input phosphor is constant is the: | ABC |
| An interaction that produces x-rays at the anode as a result of outer-shell electrons filling holes in the K-shell is called: | characteristics |
| In digital fluoroscopy, the image should be viewed on what device to take advantage of the digital capabilities? | high resolution monitors |
| Voltage ripple of 100% is characteristic of: | single phase power |
| Which of the following interactions is the primary source of diagnostic x-rays? | bremsstrahlung |
| Because the x-ray tube requires DC to operate properly, what device is required in the x-ray circuit? | rectifier |
| The accuracy of collimation at a 40-inch SID must be: | ±8/10 inch |
| At the time of exposure, the charge on the focusing cup is: | negative |
| Examples of video tubes that may be used in fluoroscopy are: | Vidicon and Plumbicon |
| The amount of time needed for an AEC to terminate the exposure is called: | Correct Minimum reaction time |
| An interaction that produces heat at the anode and also produces x-rays is called: | bremsstrahlung |
| X-rays travel as bundles of energy called: | photons |
| Grid ratio is expressed as: | Height of the lead strips to the space between them |
| The portion of an Imaging Plate that contains phosphors is the: | active layer |
| Which of the following is true regarding frequency and wavelength of electromagnetic radiation? | Wavelength and frequency are inversely proportional |
| A digital image is composed of rows and columns known as a: | matrix |
| Which of the following grid errors will result in an image that shows decreased density more to one side than the other? | lateral decentering |
| The filament circuit makes use of what type of transformer? | step down |
| Modern rectifiers are made of: | silicon based semiconductors |
| When a quality control test for exposure linearity is performed, adjacent mA stations must be within this amount of one another: | 10% |
| A primary advantage of digital fluoroscopy is: | Correct Postprocessing manipulation of the image |
| The high-voltage section of the x-ray circuit makes use of what type of transformer? | step up |
| The primary type of grid used in diagnostic imaging is: | focused |
| A step-up transformer: | Has more turns in the secondary coil than in the primary coil |
| The window level in computed radiography is the: | midpoint of densities |
| A particular x-ray room is "shooting dark." The problem arises when a change is made from 200 to 300 mA using fixed kVp techniques at 0.16 second. Which of the following would lead to an accurate diagnosis of the problem? | Correct Use of a digital dosimeter to determine exposure linearity |
| An algorithm is: | A mathematical formula used to reconstruct the image in digital imaging |
| When a spinning top test is performed on single-phase equipment, a radiograph exhibiting six dots would indicate: | an accurate timer if set on 1/20 second |
| The device in the x-ray circuit that changes AC to DC is the: | rectifier |
| A tube rating chart is used to determine: | the safety of a single exposure |
| When a quality control test for exposure reproducibility is performed, successive exposures must be within this amount of one another: | 5% |
| An x-ray machine that uses a continually decreasing mA for the shortest times possible uses a(n): | falling load generator |
| What type of current is required for proper operation of the x-ray tube? | direct |
| When a quality control test is performed to ensure that adjacent mA stations are accurate, the results must be within this amount of one another: | 10% |
| When a quality control test is performed to ensure that the same exposure factors produce consistent x-ray output, successive exposures must be within this amount of one another: | 5% |
| When a grid is used, what technical factor must be increased to compensate for the loss of image-forming rays? | mAs |
| The focusing cup is located at the: | cathode |
| An ionization chamber circuit places: | An ionization chamber between the IR and the patient |
| The number of x-ray waves passing a given point per unit time is called: | frequency |
| When a spinning top test is performed on three-phase equipment, a timer setting of 0.5 second should indicate the following on the resultant radiograph: | 180 degree arc |
| Instead of Vidicon or Plumbicon tubes, what device may be used in the television system? | CCD |
| Devices in the x-ray circuit that increase or decrease voltage are called: | TRANSFORMERS |
| Image brightness in computed radiography may be adjusted by: | changing the window level |
| The transformer with a single coil of wire serving as both the primary and secondary coils is the: | autotranformer |
| When a quality control test is performed to ensure that the penetrating ability of the x-ray beam is accurate, the result must be within this amount of the control panel setting: | 4 |
| Grids that have strips angled to coincide with divergence of the x-ray beam are called: | focused |
| The apparent size of the focal spot as viewed by the image receptor is called the: | effective focal sport |
| Where is the rectifier located in the x-ray circuit? | Between the step-up transformer and the x-ray tube |
| Radiographic contrast in computed radiography may be adjusted by changing the: | window width |
| what is the purpose of a grid | to remove scatter radiation from remnant beam |
| The transformer that makes the use of variable kVp possible is the: | autotransformer |
| When an ionization chamber is used, where is the chamber located? | Between the patient and the film |
| A full-wave rectified, three-phase, 12-pulse x-ray machine produces approximately ____% more average photon energy than a full-wave rectified, single-phase x-ray machine. | 41 |
| When a quality control test for collimator accuracy is performed, the result must be within this amount: | 2% of Sid |
| Atomic mass refers to: | The number of protons plus the number of neutrons |
| The active portion of a CR imaging plate is: | photostimulable phosphor |
| What safety feature is set when an automatic exposure control is used? | backup timer |
| Which of the following grid errors will result in an image that shows normal density in the middle but decreased density on the sides, assuming the correct side of the grid faces the x-ray tube? | grid focus decentering |
| Electronic timers used in x-ray equipment allow for exposure times as low as: | 1/1000 sec |
| The electronic device that may be used for many quality control tests on x-ray equipment is the: | digital dosimeter |
| the components of a grid are | pb strips and al interspaces |
| Grid ratio is described by which of the following? | H/D |
| What happens when a predetermined level of ionization is reached in the ionization chamber? | exposure time is terminated |
Created by:
kevincan
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