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EO Quiz 2
| Question | Answer |
|---|---|
| High capacity tube rotors revolve at ____ rpm. | 10,000 |
| Primary windings is equal to 5,000 and the secondary windings equals 100. What would the output amperage be if the input amperage is 2? | 100 Amp |
| Full-wave rectified, three-phase units provide an x-ray beam at ___ pulse(s) per second. | 360 |
| An increase of 15% in kVp is equivalent to increasing mAs ___. | 100% |
| A diode allows electrons to flow from _____. | cathode to anode |
| The _____ is/are outside the glass envelope. | Stators |
| The target of the rotating anode is usually coated with a _____ alloy. | tungsten |
| A single-phase waveform has ____ ripple. | 100% |
| In modern imaging systems, the components for rectification are _____. | solid state semiconductors |
| Primary windings is equal to 100 and the secondary windings is equal to 65,000. What would the output voltage be if the primary voltage is 50? | 32,500 Volts |
| Bremsstrahlung x-rays are produced by ____ at the target. | slowing electrons |
| The most accurate type of timer is the ____ timer. | electronic |
| What would the output voltage be if the primary voltage is 220. The primary has 250 windings and the secondary has 275 windings. | 242 Volts |
| How does added filtration affect the emission spectrum? | Added filtration causes reduced amplitude and a shift to the right on the emission spectrum. |
| Changes in _____ result in directly proportional changes in the amplitude of the emission spectrum. | both mA and time |
| Variations in power distribution to the x-ray machine are corrected by the _____. | line voltage compensator |
| The amplitude of the emission spectrum with a ____ generator is ____ it is with a three-phase generator. | single-phase, lower than |
| Characteristic x-rays are produced by ____. | released binding energy |
| When electrons bombard the target, ____% of their kinetic energy is converted to heat. | 99 |
| The _____ circuit provides electrons for the x-ray tube current. | filament |
| An x-ray beam that could pass through dense tissue would have high _____. | quality and penetrability |
| Three main parts of the x-ray imaging system are the x-ray tube, ____, and _____. | operating console, and high voltage generator |
| The half value layer (HVL) of an x-ray beam is a measurement of beam _____. | quality |
| Because of the line focus principle, the effective focal spot size decreases with decreasing _____. | target angle |
| A step-down transformer is located in the _____ circuit. | filament |
| An x-ray exposure of 200 mR is recorded at a distance of 40 inches. If the same technical factors are used, what will the exposure be if the distance is increased to 72 inches? | 61.73 mR |
| A low quality beam would also have low ______. | penetrability |
| The quantity of bremsstrahlung radiation increases proportionally with increased _____. | mAs |
| Electron interactions at the inner-shell of the target atoms produce _____ radiation. | characteristic |
| An exposure taken at 100 kVp would have a continuous emission spectrum with a maximum energy of ____keV. | 100 |
| Approximately ______ of the kinetic energy of the projectile electrons is converted to x-rays at the target. | 1% |
| The main purpose of added filtration is to reduce _____. | patient dose |
| If the intensity of a 70 kVp exposure at 20 mAs is 1.0 mGya, what would it be at 5 mAs? | 0.25 mGya (exposure is proportional to mAs) |
| The rotating anode is turned by a _____. | magnetic field |
| If the distance from the source to the image (SID) is reduced by half, how is the x-ray intensity at the image affected? | Intensity increases 4 times because of the inverse square law |
| With half-wave rectification, the current flows through the x-ray tube during the ____ part of the cycle. | positive |
| At 55 kVp, _____ of the x-rays produced are bremsstrahlung. | 100% |
| X-ray quantity increases in direct proportion to increases in ___. | mAs |
| An increase in mAs would _____ the ____ of the emission spectrum. | increase, amplitude alone |
| The effective focal spot size is _____ the actual focal spot size. | smaller than |
| The penetrability of an x-ray beam is called x-ray _____. | quality |
| The number of x-rays in the useful beam defines x-ray _____. | quantity |
| At the target, the projectile electrons interact with _____. | both outer and inner shell electrons in the target |
| Voltage across the x-ray tube is most constant with _____. | high frequency generators |
| The first component to receive power in the x-ray circuit is the ____. | autotransformer |
| The most widely used support structure for the x-ray tube is the ____. | ceiling support system |
| An increase in kVp would _____ the _____ of the emission spectrum. | increase, position alone |
| During an exposure, most of the ____ energy of the projectile electrons is converted to _____. | kinetic, heat |
| If an exposure is 0.5 mGya at an SID of 40 inches, what would the exposure be at an SID of 60 inches? | 0.222 mGya (because of the inverse square law) |
| The discrete portion of the x-ray emission spectrum would change position with a change in _____. | target material |
| The operating console contains circuits that are _____. | both high and low voltage |
| Thermionic emission at the filament creates a _____. | space charge |
| Projectile electrons travel from ______. | cathode to anode |
| The difference in the waveform between the primary and secondary sides of the high voltage transformer is _____. | amplitude |
| What is the formula for heat units for a HF x-ray machine? | kVp x mA x seconds x 1.35 |
| The cathode side of the tube should be directed toward the ____ part of the patient. | thicker |
| The negative side of the x-ray tube holds the ______. | filament |
| The x-ray intensity is lower on the anode side of the tube because of the _____. | heel effect |
| A 15% increase in kVp is equivalent to _____. | doubling the mAs |
| Beam quality is affected by _____. | kVp and filtration |
| X-ray beam quality is improved by _____. | increasing filtration |
| Added filtration will _____ beam quality and ____ quantity. | increases, decreases |
| Most of the x-rays produced at the target are ____. | bremsstrahlung |
| The filament is made of ______. | tungsten |
| The ______ is the source of radiation in the x-ray tube. | focal spot |
Created by:
Kdobson