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Question 1
Increasing kVp, field size, and part thickness will result in
Correct Answer:
Increased scatter fog
Explanation:
Increasing the beam energy, irradiated area, and patient thickness all boost the amount of scatter radiation produced and reaching the image receptor. Higher kVp makes photons more energetic, which shifts interactions toward Compton scatter; more scatter produced means more of it arrives at the detector as fog, lowering image contrast. A larger field irradiates more tissue, giving more opportunities for scatter events and thus more scatter reaching the detector. Greater part thickness lengthens the photon’s path through tissue, increasing the likelihood of scatter as photons traverse the material. The combined effect is increased scatter fog on the image, which degrades contrast and does not improve sharpness.
Question 2
Increasing SID will result in?
Correct Answer:
Lower patient dose
Explanation:
Increasing SID means the X-ray source is farther from the patient. The beam spreads out more as distance grows, and according to the inverse square law, the intensity at the patient drops with the square of the distance. With the same exposure settings (mA and exposure time), less radiation reaches the patient, so the entrance skin dose is reduced. The image receptor would also receive less exposure, which is why technique adjustments are often made to maintain image brightness, but the straightforward effect on patient dose is a decrease.
Question 3
When applying the 2 kVp per cm rule, you are adjusting
Correct Answer:
Kilovoltage (kVp) only
Explanation:
The main idea is using kilovoltage to compensate for changes in how much the body part attenuates the X-ray beam. When a part is thicker, it attenuates more; increasing kVp by about 2 per additional centimeter raises the beam’s penetrating power so the image receptor still receives enough exposure. This rule specifically targets changing kilovoltage, not adjusting the tube current (mA), exposure time, or distance. Adjusting mA or time would change the number of photons and the overall exposure, while distance changes intensity via the inverse-square law; but the 2 kVp per cm guideline is about tweaking kVp to maintain consistent image brightness and adequate penetration.
Question 4
Grid Frequency is defined as
Correct Answer:
Number of lead strips per inch
Explanation:
Grid frequency is the number of lead strips in a radiographic grid per unit length, typically expressed as lines per inch (lpi). This tells you how many opaque lines appear in one inch of the grid. More strips per inch means thinner, more closely spaced lead lines, which can improve scatter absorption and reduce grid-line visibility, though it can make the grid more sensitive to misalignment or improper exposure. The other descriptions refer to different grid characteristics: how the grid lines are focused relates to grid focus distance, the height of the lead strips divided by the space between them is the grid ratio, and the SID at which a grid should be used is about placement distance, not the number of strips.
Question 5
Which cells would exhibit the greatest radiation effects according to Bergonie and Tribondeau?
Correct Answer:
Cells with greatest reproductive activity and longest mitotic phases
Explanation:
Radiosensitivity rises with how actively a cell divides and how undifferentiated it is. Bergonie and Tribondeau showed that cells with high reproductive activity and a long potential to divide (mitotic future) are most susceptible to radiation damage. The description of cells with the greatest reproductive activity and the longest mitotic phases fits this pattern, so they would show the greatest radiation effects. Neurons are largely non-dividing and highly differentiated, so they’re relatively resistant. Mature bone cells are differentiated and not rapidly dividing, also reducing sensitivity. Highly differentiated cells in general have lower radiosensitivity than actively dividing, less differentiated cells.
Question 1
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Prepare with the Ohio General X-Ray Machine Operator (GXMO) Practice Exam practice quiz. This question bank includes 10 questions covering result, radiation, increasing, effects, and dose. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Ohio General X-Ray Machine Operator (GXMO) Practice Exam

This practice set contains 10 questions from the matching question bank and focuses on result, radiation, increasing, effects, and dose. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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