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ImgEquip
LP4 PP & Clover learning qs
| Question | Answer |
|---|---|
| What are the 3 components of an x-ray imaging system? | X-ray tube, operating console, & high voltage generator |
| Define resistor | inhibits flow of current through a circuit |
| A step-UP transformer increases/decreases voltage & increases/decreases amperage | INCREASES voltage, & decreases amperage |
| The resistance of electric flow through a circuit is measured in | Ohm |
| Electrical current is measured in units of | Amperes |
| The control panel is High/Low Voltage? | LOW voltage |
| Alternating current comes in at ____cycles per sec which = 1 ____ | 60 cycles per sec, 1 Hertz |
| Which component of the xray circuit must be powered by alternating current in order to function | Transformers |
| What are the 3 types of transformers? | Autotransformer, Step-Up, Step-down transformer |
| What is a single winding with an iron core in the middle | Autotransformer |
| What checks the incoming voltage? | Line monitor |
| What measures voltage and adjusts it to make it precise? | Line compensator |
| The autotransformer is located between the ____ ____ ____ and the _____ ______ transformer | Main power supply, step-up transformer |
| An Autotransformer functions based on the principle of | Self-induction |
| AC(alternating current) is best described as current that alternates between | positive and negative polarity |
| Type of rectifier that's used in the modern xray tube is called | diode |
| Which components of the x-ray tube must receive AC in order to function | Autotransformer, Step-Up transformer, & Step-down transformer |
| Which type of rectification will produce an xray beam with the greatest intensity | Full wave rectification |
| What part in the x-ray system is considered a rhiostat | mA selector |
| In the x-ray circuit rectifiers are located in the | secondary circuit |
| Which timer is the most accurate, most common, and is used for rapid exposure? | Electronic |
| What is the safety feature of the AEC called? | Back up timer- which is set to 1.5 times the original time |
| Step-Up transformer formula | Vs/Vp= Ns/Np |
| Step-Up & Step-down transformers work off | Mutual Induction |
| Step-down transformer formula | Np/Ns=Is/Ip |
| In which circuit is the focal spot selector located | Filament circuit |
| What is the ripple for a 3 phase, High Frequency ? | <1% |
| What controls tube current? | Filament circuit |
| Thyratron is also known as | the density control |
| Define Minimum Response Time | the length of time necessary for the AEC to respond to the ionization and send a signal to terminate the exposure. |
| What MRT do modern AEC's have? | Modern AEC's have a MRT of 0.001 second |
| What is the function of a step-down transformer within the x-ray circuit? | increase current |
| Which device is located within the filament circuit of the xray system? | mA selector |
| The amount of time the kilovoltage potential is applied to the x-ray tube is controlled by which device? | exposure timer |
| In xray tube circuit, amperage must be increased to heat the filament for thermionic emission, which transformer would accomplish an increase in amperage? | Step-down transformer |
| Which technical factor controls the temperature of the cathode filament within the xray tube? | mA |
| The waveform of commercial power supply to the xray circuit is a(n)- | Alternating Current (AC) |
| Type of transformer required to increase the voltage to kilovoltage level required for the production of xrays | Step-Up transformer |
| A transformer is described as having a turns ratio of 40:1, how will this transformer change amperage? | amperage will decrease b/c this is a step-up transformer |
| Advantages of utilizing imaging equipment with minimal voltage ripple in xray tube? | increased xray quantity, increased xray quality, and increased xray penetrability |
| The filament current is controlled by the tech through a device called | Rheostat |
| Within the x-ray circuit, the step-down transformer is located btwn the | mA selector and cathode filament |
| In xray circuit, the rectifiers are located in the | secondary circuit |
| W/in an electrical circuit, term voltage refers to | electrical force creating electron movement in the circuit |
| A transformer with a greater number of turns on the primary side compared to the secondary side would be called a | step-down transformer |
| The autotransformer includes which device | kVp selector |
| Failure of rheostat would result in inability to | modify the filament current |
| Failure of the autotransformer w/in xray tube circuit results in inability to | modify xray tube voltage |
| W/in xray circuit, the rectifiers are located between | step-up transformer & xray tube |
| mAs timer monitors | mAs, shortest time, located on secondary side of HV transformer |
| Synchronous timer syncs exactly to | 60 cycles/sec, minimum exposure time, & it must be reset after each exposure |
| x-ray system operates at ___-___ kVp, and ___-____ mA | 24-150kVp, & 100-1200 mA |
| HV Generator contains which 4 components | 2 Transformers, Rectifiers, mA meter, & Focal spot selector |
| HV Generator provides power 3 ways | single phase, 3 phase, & HF |
| Which device is located in the secondary circuit of x-ray system | x-ray tube |
| The rectification bridges within the x-ray circuit function to modify the electrical power w/in x-ray system by converting | AC (alternating current) to DC (direct current) |
| In order to create a steady flow of highly penetrating x-rays, power arriving at x-ray tube must be | High-Voltage Direct Current (DC) |
| Part of x-ray circuit ensures that electrons flow in only one direction through the x-ray tube? | Rectifiers |
| Within x-ray circuit, rectifiers are positioned btwn the | Step-Up Transformer & x-ray tube |
Created by:
Levanw