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DOH Dental Assistants (DOH-DA) Practice Tests & Test Prep by Exam Edge - Free Test


Our free DOH Dental Assistants (DOH-DA) Practice Test was created by experienced educators who designed them to align with the official Department of Health (DOH) Abu Dhabi content guidelines. They were built to accurately mirror the real exam's structure, coverage of topics, difficulty, and types of questions.

Upon completing your free practice test, it will be instantly reviewed to give you an idea of your score and potential performance on the actual test. Carefully study your feedback to each question to assess whether your responses were correct or incorrect. This is an effective way to highlight your strengths and weaknesses across different content areas, guiding you on where to concentrate your study efforts for improvement on future tests. Our detailed explanations will provide the information you need to enhance your understanding of the exam content and help you build your knowledge base leading you to better test results.

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DOH Dental Assistants - Free Test Sample Questions

The X-ray machine control that determines the duration of an X-ray exposure is called the:

Correct Answer:
timer.
the x-ray machine control that determines the duration of an x-ray exposure is called the timer. this component is crucial as it directly influences the amount of radiation the patient is exposed to during an x-ray procedure. the timer allows the operator to set how long the x-ray tube emits radiation, and this duration can vary depending on the type of examination and the specific body part being imaged.

it is important to understand the distinction between the timer and other controls on an x-ray machine: 1. **ma selector**: the milliampere (ma) selector controls the current passing through the x-ray tube. the level of current affects the quantity of x-ray photons produced, which in turn influences the density (brightness) of the final x-ray image. however, it does not determine the length of exposure. 2. **kvp selector**: the kilovoltage peak (kvp) selector adjusts the voltage across the x-ray tube. this setting affects the energy of the x-rays produced. higher kvp values result in higher energy x-rays, which can penetrate denser tissue. this control also impacts the contrast of the x-ray image but does not control the exposure time. 3. **timer**: the timer specifically controls the duration that the x-ray tube is active, emitting x-rays. setting the correct exposure time is essential to ensure that enough radiation is emitted to produce a clear image without exposing the patient to unnecessary radiation.

in summary, while the ma selector and kvp selector adjust the quality and characteristics of the x-ray beam, it is the timer that sets the duration of the exposure, which is crucial for both patient safety and image clarity. proper management of these controls ensures effective and safe radiographic practices.