OHST Practice Exam

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Prepare for the OHST Exam. Use diverse question formats and detailed explanations to enhance your study experience. Ace your certification!

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What is the maximum protection that a powered particulate-filter respirator can provide?

10
100
3000
5000

The correct answer is: 3000

A powered particulate-filter respirator is designed to offer high levels of protection against airborne particulate matter. The maximum protection it can provide is typically measured in terms of its Assigned Protection Factor (APF). The number given indicates the level of contaminant concentration that a worker can be exposed to relative to the concentration in the environment, while still maintaining a safe level of exposure. In the case of option C, which indicates a maximum protection level of 3000, this number reflects a scenario where the levels of airborne contaminants are significant. The APF of 3000 means that the respirator is able to allow only 1 part of a contaminant into the breathing air for every 3000 parts of the contaminant in the environment. This level of filtration is beneficial in environments where hazardous particulate levels are extremely high, providing robust protection for the user. Other options, representing lower levels of protection, would not offer the same degree of safety in high-exposure scenarios, emphasizing why 3000 is recognized as the maximum level an effective powered particulate-filter respirator can achieve.