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Radiology Final
| Question | Answer |
|---|---|
| Which of the following is an advantage that a rotating anode tube will have over a stationary anode tube? | 1. Increased heat dissipation 2. Higher tube currents 3. Reduced roughing of the target |
| The selection of voltage to the high tension transformer is most commonly made by adjusting the: | |
| In which of the following portions of the x-ray circuit is a step-down transformer located? | Filament circuit |
| In a grid-controlled x-ray tube, the ________ is the exposure switch that turns the x-ray tube on and off very rapidly producing multiple exposures for precise exposure times | |
| Radiographic examinations require large tube currents and using serial exposures will often employ high speed rotating anodes with rotational speeds of about: | 10,000 rpm |
| The force within an electrical circuit most responsible for the movement of current is termed the: | Potential difference |
| The prereading kV meter is incorporated into the x-ray control panel to measure the potential difference on the | Secondary side of the autotransformer |
| The electrical device used to adjust the mA selection is the: | Variable resistor |
| The x-ray tube envelope is composed of a heat resistant material called | Pyrex glass |
| The control for the amount of filament current in most modern radiographic units is directly related to the: | |
| Which of the following is generally found on the operating console of a x-ray machine? | 1. kV control switch 2. mA control switch 3. Timer control switch |
| In a step-up transformer, the current in the secondary side is_____ than the current in the primary side | lower |
| Referring to the diagram of the basic x-ray circuit, the number “7” refers to which of the following components? | Filament circuit variable resistance |
| What x-ray tube component does the number 8 in Figure 5-3 indicate? | Focal track |
| Electric current in which electrons flow first in one direction and then in the other (oscillate back and forth) is called: | Alternating (AC) current |
| Which of the following statements concerning a series circuit is true | |
| In a solid conductor, current consists of a flow of moving: | Electrons |
| The main reason tungsten is employed as filament material in a x-ray tube is its: | 1. High atomic number 2. High melting point 3. High thermal conductivity |
| Most x-ray machines used in the United States are designed to operate on a 110 volt, 220 volt or 440 volt | 60 hertz, alternating current power supply |
| Rectification is used to suppress the inverse voltage associated with alternating current before it reaches the x-ray tube. This helps to: | |
| All of the following x-ray circuit devices are located between the incoming power supply and the primary coil of the high-voltage transformer except the | mA meter |
| The power of a circuit is equal to the product of current and voltage and is measured by the unit: | Watt |
| A three phase alternating current wave form is represented by number | 4 |
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Sunshine9746