Occupational and Environmental Health: Recognizing and Preventing Disease and Injury - Multiple Choice Questions - Learn & Prevent

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Prepare for the Occupational and Environmental Health exam with our multiple-choice questions designed to help you recognize and prevent disease and injury. Study effectively and gain confidence for your upcoming test!

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What does the effectiveness of a local exhaust ventilation depend on?

  1. The speed of the air pump

  2. The distance from the source of emission and presence of cross-drafts

  3. The color of the exhaust vent

  4. The temperature of the air being ventilated

The correct answer is: The distance from the source of emission and presence of cross-drafts

The effectiveness of a local exhaust ventilation system is dependent on the distance from the source of emission and the presence of cross-drafts. This is because the purpose of a local exhaust ventilation system is to remove harmful substances from the air and prevent them from spreading throughout the environment. Therefore, the closer the exhaust vent is to the source of emission, the more effectively it can capture and remove the harmful substances. Additionally, the presence of cross-drafts, which refers to air movement across the path of the exhaust vent, can greatly influence the capture and removal of harmful substances. A strong cross-draft can disrupt the airflow of the exhaust, reducing its effectiveness. Therefore, the color of the exhaust vent or the temperature of the air being ventilated, while potentially important factors in other contexts, are not relevant to the effectiveness of a local exhaust ventilation system in removing harmful substances from the air.

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