# RT 110 physics test

 The flashcards below were created by user fongpay03 on FreezingBlue Flashcards. What is the wave equation? Velocity = frequency x wavelength If frequency increases, then wavelength _______ decreases If frequency decreases, then wavelength _________ increases What is defined as the number of wave forms per second? Frequency Frequency is a representation of _______ energy X-ray photons are about __ cycles per second 10^19 As beam energy is increased, frequency ______ increases Beam energy is determined by what? kVp The higher the kVp, the _____ the ________ (there are 4) the higher the photon frequencythe higher the beam qualitythe harder the beamthe higher the penetrability of the beam Higher energy photons act like what? particlesnote: if they hit something, they do damage Low energy photons act like what? wavesnote: they just bump into things. takes a lot to do damage An electric current is induced in a circuit if part of the circuit is in a changing magnetic field. A magnetic field can be generated by alternating magnetic fields. This is known as what? Faraday's Law Transformers work with __ current through the application of Faraday's Law. AC-alternating current The goal of a step-down transformer is? To decrease the incoming voltage and increase current. ***They work on the principle of mutual induction***Allows for thermionic emission to occur at the filament***Ultimately, provides the electrons necessary for x-ray production. Which side of the step-down transformer has fewer windings? Secondary side The goal of a step-up transformer is? To increase the voltage Which side of the step-up transformer has more wires? Secondary side***therefore a higher voltage is produced Which side of the step-up transformer does the voltage come in? Primary side What are 2 other names for the step-up transformer? high-voltagehigh-tension What has only one winding and works on the principle of self-induction? autotransformer What are the 3 types of transformers? Closed-core transformerAutotransformer (single)Shell-type transformer What gets transformed in a transformer? Voltage and current What are the 3 sections of the x-ray circuit Operating (control) consoleHigh voltage generatorX-ray tube What addresses the issue of the divergent beam? Inverse Square Law***As the beam travels it diverges or spreads out. The further it travels the more spread out it becomes, however, the intensity will be diminished What are conditions that are necessary for x-ray production? High voltage-in the kilovolt rangeElectrons-a supply of electrons and a need to stop the electrons suddenly How do transformers work? The can only work using AC currentOn the principle of induction - mutual and selfThe basic premise is that the AC current "induces" alternating magnetic fields in loop (coils) of wireThese alternating magnetic fields are distributed throughout the core of the transformer What is the conservation of energy? When voltage is increased, the current decreases Which side of the step-down transformer has more coils? The primary side***This results in a decrease in voltage through the transformer What consists of the operating (control) console? Line voltage compensator/monitorAutotransformerkVp selectormA selectorTimerPre-reading kVp meter What is the purpose of the line voltage compensator? To maintain a constant voltage to the system. In the modern system this is done automatically The autotransformer works on what principle? Is it a step- up or step-down transformer or both? The autotransformer works on the principle of self-induction. It has a single core and is responsible for varying the voltage.Because of its ability to adjust voltage, the autotransformer can be either a step-up or step-down transformer. Where is the kVp adjusted at? The autotransformer Why is the kVp meter considered pre-reading? •The kVp meter is considered pre-reading because it is not actually measuring kVp but measuring voltage off the autotransformer.***Remember, the autotransformer is used to adjust voltage. What types of electronic timers are out there as of today? mAsPhototiming (AEC)Regular electronic What does the mA selector do? Allows for adjust of the filament voltage***Precision resistors***Choke coil What is another name for the step-down transformer? Filament transformer What is the purpose of the retifier? To allow electrons to flow in only one direction How many retifiers are required to fully convert AC to DC? 4 retifiers Rectifiers convert __ to __ current AC to DC current What are the types of circuits? Single phaseThree phaseMedium and high frequencyCapacitor discharge What consists of the single phase? Full waveHalf wave What consists of the three phase? 6 pulse12 pulse What do the three phase units use for transformers? Delta and 'wye' In a three phase transformer, the 6 pulse uses what and how many transformers? 2 'wye' and 1 delta In a three phase transformer, the 12 pulse uses what and how many transformers? 2 delta and 1 'wye' Three phase transformers require how many rectifiers? 12 retifiers What are the advantages of three phase? Higher beam quantity and qualityHigher mA stations are also possible Why higher quantity and quality for three phase? Because the voltage ripple is less***Basically when the tube is energized it stays energized. The turns ratio for the step-up transformer is: 500:1 or 1000:1 Authorfongpay03 ID113280 Card SetRT 110 physics test DescriptionRT 110 physics test Updated2011-11-18T06:10:30Z Show Answers