Physics Chapter 5
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52 terms
Terms | Definitions |
|---|---|
 How many alterations in the direction of the current flow occur in 0.10 second in a 60 Hz AC current? | 12 |
| At what point in the x-ray circuit is the rectification circuit loaded? | Between the step up transformer and the x-ray tube |
| Where is the stator of the anode induction motor located? | Outside the glass envelope and outside the rotor |
| The exposure switch on an x-ray machine is intended to? | Intitiate the exposure |
| The exposure switch is found between the? | Autotransformer and the timer circuit |
| The electrical device used to adjust the mA selection is a? | Variable resistor |
| The time control is found between the? | Exposure switch and the step up transformer |
| The mA control is found between the? | Incoming line and the step-down transformer |
| The kVp control is found between the? | Incoming line and the exposure switch |
| All of the following are radiographer-operated controls EXCEPT? | Rotor speed |
| The diagnostic x-ray range is approximately? | 10 to 1,200mA, 0.001 to 10 seconds, 25 to 150 kVp (all of the above) |
| The key advantage of a curved-top radiographic table is the? | Smaller object image distance (OID) |
| When using AEC at 80 kVp, backup times? | Must not exceed 600 mAs |
| Radiographic rooms equipped with a tilting table are primarily designed for performing _______procedures. | Fluoroscopic |
| What is NOT a tube support system? | Fluoroscopic tower |
| To protect the radiographer during x-ray exposures? | The mA and kVp selections are on the low voltage side of the circuit |
| Which tube suspension system offers the greatest multidirectional movement? | Overhead tube suspension system |
| The incoming line current is supplied? | In the form of a three-phase power cycle |
| Nearly all types of x-ray equipment operate from an incoming line of? | 210V |
| When full-wave rectification is applied to a three-phase current, a __________ripple is produced. | Voltage |
| A three-phase, rectified current produces a voltage ripple of ____pulses per Hz. | 6 |
| Ancillary equipment for tilting tables include? | Footbard, handgrips, shoulder supports (all of the above) |
| All of the following are desired features of radiographic tables EXCEPT? | Low abrasion surface to lessen patient slippage as they transfer |
| High frequency generators? | Use invertors to increase pulse frequency, produce similar output to three-phase with a single phase source, achieve peak kVp faster than single or three phase generators (all of the above) |
| Falling load generators? | Are designed to use the highest allowable mA |
| Radiographing a thin body part using automatic exposure control (AEC)? | Is recommended to in order to reduce dose |
| Automatic exposure control (AEC) technology determines? | Exposure time |
| Present day AEC technology utilizes? | Ionization chamber technology, minimum reaction times as short as 1 ms, a pre-detector AEC chamber position (all of the above) |
| When compared to batter-powered portable radiographic units, capacitor discharge mobile units? | Produce more consistent exposures |
| When compared to single-phase electrical current, three-phase power? | Permits short exposures, produces 360 pulses per second, produces less voltage ripple (all of the above) |
| What regulates exposure time based upon patient thickness and density? | AEC |
| What is located between the incoming line and exposure switch and determines kVp? | Autotransformer |
| What is a two-position device used to initiate exposure? | Exposure switch |
| What is a low-voltage circuit that supplies 3 to 5 amperes? | Filament current |
| What produces two pulses of electricity in 0.008 sec? | Single-phase power |
| What yields approximately 40% higher average energy per exposure? | Three-phase power |
| What is an excellent x-ray tube positioning flexivility with patients on carts? | Overhead tube suspension system |
| What is required for myelography procedures with the table tilted Trendelenburg? | Shoulder supports |
| What is used by orthodontists to assess the alignment of teeth and jaw disorders? | Panoramic dental and facial system |
| What is routinely used for chest radiography? | Upright Bucky unit |
| What is an inexpensive tube support design typically seen in small clinics? | Floor-to-ceiling suspension system |
| What is an x-ray tube and image receptor that is fixed to opposide ends of an arc design? | C-arm tube suspension |
| What is #1 in an x-ray circuit? | Main braker |
| What is #2 in an x-ray circuit? | Exposure switch-activates the rotating anode of the x-ray tube |
| What is #3 in an x-ray circuit? | Autotransformer-modifies the incoming line voltage in anticipation of the kv that will be produced by the step up transformer |
| What is #4 in an x-ray circuit? | Timer circuit |
| What is #5 in an x-ray circuit? | High voltage step up transformer |
| What is #6 in an x-ray circuit? | Four-diode rectification circuit |
| What is #7 in an x-ray circuit? | Filament circuit variable resistance- modifies the incoming line power ot produce the thermionic emission from the filament wire of the xray tube by a sequence of devices |
| What is #8 in an x-ray circuit? | Filament step down transformer |
| What is #9 in an x-ray circuit? | X-ray tube |
| What is #10 in an x-ray circuit? | Rotor stator |
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