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48 Cards in this Set
- Front
- Back
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Standing erect, facing foward with the palms of the hands foward, describes which of the following?
A. Oblique position B. Trendelenburg position C. Anatomical position D. Upright position |
C. Anatomical position
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How will the north pole and the south pole of two magnets affect each other?
A. They will attract. B. They will repel. C. They will change polarization. D. They will not be affected. |
A. They will attract
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Which of the following happens when a wire moves through a magnetic field?
1. An electromotive force is induced 2. The resistance in the wire increases 3. The magnetic field disappears A. 1 only B. 2 only C. 2 & 3 only D. 1, 2 & 3 |
A. 1 only
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Maximum induction will occur when a conductor cuts a magnetic field at what angle?
A. 0 degrees B. 45 degrees C. 90 degrees D. 180 degress |
C. 90 degrees
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Materials that are difficult to magnetize and demagnetize are said to have a high ________.
A. Retentivity B. Repelability C. Permeability D. Attractability |
A. Retentivity
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A coil of wire rotating through a magnetic field produces an electric current. What does this describe?
A. Motor B. Rectifier C. Generator D. Transformer |
C. Generator
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The source-to-skin distance for stationary fluoroscopy must NOT be less than which of the following?
A. 5" B. 15" C. 20" D. 40" |
B. 15"
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When using mobile radiographic equipment, the source-to skin distance cannot be less than what?
A. 12" B. 24" C. 36" D. 48" |
A. 12"
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A fetus is most vulnerable to radiation during which of the following time periods?
A. First trimester B. Second trimester C. Third trimester D. Fourth trimester |
A. First trimester
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Which of the following are things a radiographer should do in order to avoid unnecessary patient exposure?
1. Avoid retaking radiographs 2. Use hig speed screens 3. Keep equipment in good working order A. 1 & 2 only B. 1 & 3 only C. 2 & 3 only D. 1, 2 & 3 |
D. 1, 2 & 3
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What is the name of the filtration that is a permanent part of the x-ray tube head?
A. Added filtration B. Inherent filtration C. Compensating filtration D. Stem filtration |
B. Inherent filtration
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Which of the following types of beam restricting devices is considered the best at REDUCING PATIENT EXPOSURE?
A. Cone B. Diaphragm C. Collimator D. Extension cylinder |
D. Extension cylinder
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What is the branch of science tha tdeals with matter, energy and their relationship to each other?
A. Radiologic physics B. Biology C. Chemistry D. Physics |
D. Physics
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The branch of physics pertaining to the origin and nature of x-rays is defined by which of the following?
A. Electronics B. Quantum mechanics C. Radiologic physics D. Physical science |
C. Radiologic physics
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A body at rest or in uniform motion remains in the same state unless a force is applied describes what?
A. A = F/m B. For every action there is a reaction C. Newton's first law of motion D. Coulomb's law |
C. Newton's first law of motion
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What must be applied in order to set a resting body in motion?
1. Potential energy 2. Work 3. Force A. 1 only B. 3 only C. 2 & 3 only D. 1, 2 & 3 |
B. 3 only
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Which of the following formulas states Newton's second law of motion?
A. F = ma B. W = Fd C. E = mc square D. K.E. = 1/2mv square |
A. F = ma
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What is the unit of length in the metric MKS system?
A. Meter B. Liter C. Kilogram D. Yard |
A. Meter
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How can a compression band improve radiographic quality?
1. Reduce scatter radiation 2. Reduce patient motion 3. Improve radiographic contrast A. 1 only B. 2 only C. 1 & 3 only D. 1, 2 & 3 |
D. 1, 2 & 3
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Which of the following tests will determine the focal spot size?
A. Safelight test B. Wire mesh test C. Wisconsin test cassette D. Star pattern test |
D. Star pattern test
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Off - distance grid cut-off is characterized by which of the following?
A. The top of the image is underexposed B. Both sidses of the image are underexposed C. One side of the image is underexposed D. The bottom of the image is underexposed |
B. Both sidses of the image are underexposed
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What is the main reason why beam filters are used in radiography?
A. Improves contrast B. Improves radiographic quality C. Reduces patient exposure D. Prolongs tube life |
C. Reduces patient exposure
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What is a 3-dimensional radiograph called that is produced by two angled views of the same structure?
A. Stereoradiograph B. Tomogram C. Scanogram D. Bi-radiograph |
A. Stereoradiograph
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The use of intensifying screens will have which of the following effects?
A. Decrease patient exposure B. Decrease contrast C. Decrease density D. Decrease radiographic fog |
A. Decrease patient exposure
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What controls the incoming voltage to the autotransformer?
A. Rectifier B. Main breaker switch C. Fuses D. Timer |
B. Main breaker switch
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Which of the following is the most accurate timer?
A. Impulse timer B. Synchronous timer C. Sine-wave timer D. Electronic timer |
D. Electronic timer
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Tapping windings of the autotransformer to supply voltage to the step-up transformer is the purpose of which of these?
A. kVp selector B. Voltmeter C. Voltage compensator D. Rheostat |
A. kVp selector
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If line voltage changes because of demands by other users, adjustments must be made in which of the following?
A. Step-up transformer B. Rheostat C. Voltage compensator D. Prereading voltmeter |
A. Step-up transformer
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Which of the following is placed in the circuit in case of current changes during the exposure?
A. Transformer B. Breaker switch C. Choke coil D. Rectifier |
B. Breaker switch
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Where in the x-ray circuit is the timer located?
A. In the secondary circuit B. Between the autotransformer and the step-up transformer C. Before the step-down transformer D. Between the rectifier and the x-ray tube |
B. Between the autotransformer and the step-up transformer
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What causes most x-ray tube failures?
A. Heating of the anode B. Miltiple exposures C. Cracked glass D. Excessive Heat |
D. Excessive Heat
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What type of primary radiation is produced when the x-ray tube voltage is below 70 kVp?
A. Characteristic B. Bremsstrahlung C. Compton D. Scatter |
B. Bremsstrahlung
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What type of motor drives the rotating anode?
A. Synchronous B. Induction C. Direct current D. Inductive reactance |
B. Induction
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Which part of the x-ray tube has the filament wires and focusing cup?
A. Cathode B. Anode C. Housing D. Impregnated glass |
A. Cathode
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As kilovoltage is applied, the electrons are accelerated toward which part of the x-ray tube?
A. Cathode B. Anode C. Window D. Stem |
B. Anode
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Which of the following will produce the least load on an x-ray tube?
A. High kVp, high mAs B. High kVp, low mAs C. Low kVp, high mAs D. All will produce an equal load |
B. High kVp, low mAs
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In a modern, rotating anode x-ray tube, which of the following will coat the tungsten disk?
A. Tungsten rhenium alloy B. Tungsten molybdenum alloy C. Tungsten copper alloy D. Tungsten lead alloy |
A. Tungsten rhenium alloy
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During an exposure, what electrical charge is placed on the anode?
A. Negative B. Positive C. Covalent D. Neutral |
B. Positive
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What is the process of "boiling off" electrons called?
A. Space charge production B. Electron emission C. Thermionic emission D. Heat production |
C. Thermionic emission
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From what metal are the filament wires in radiographic tubes made?
A. Molybdenum B. Lead C. Copper D. Tungsten |
D. Tungsten
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Which of the following is NOT related to the others?
A. Rotor B. Target C. Filament D. Tungsten disk |
C. Filament
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In what units is filament current measured?
A. Voltage B. Kilovoltage C. Amperage D. Milliamperage |
C. Amperage
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Which of the following is smallest?
A. Space charge B. Actual focal spot C. Effective focal spot D. Target |
C. Effective focal spot
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When were x-rays discovered?
A. November 8, 1895 B. November 5, 1898 C. January 13, 1896 D. January 6, 1913 |
A. November 8, 1895
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What is it called when a primary photon changes direction but NOT energy?
A. Coherent (classical) scatter B. Modified scattering C. Compton effect D. Photoelectric absorption |
A. Coherent (classical) scatter
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Which of the following interactions does NOT occur under 125 kVp?
A. Compton effect B. Pair production C. Photoelectric absorption D. Coherent (classical) scatter |
B. Pair production
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Which of the following would best describe the wavelengths of a diagnostic x-ray beam?
A. Homogeneous B. Heterogeneous C. Monochromatic D. Monoenergetic |
B. Heterogeneous
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Which of the following will NOT reduce the intensity of an x-ray beam?
A. Compton effect B. Photoelectric absorption C. Characteristic effect D. Pair production |
C. Characteristic effect
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