Massachusetts 2nd Class Fireman's Practice Exam

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Study for the Massachusetts 2nd Class Fireman's Exam. Prepare with flashcards and multiple-choice questions, each with hints and explanations. Get ready to excel in your exam!

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When checking a safety valve using hand-lifting gear, the pressure should be no lower than what percentage of the safety valve set pressure?

30%
50%
75%
100%

The correct answer is: 75%

When performing a safety valve check using hand-lifting gear, it's crucial that the pressure be at least 75% of the safety valve's set pressure. This ensures that the valve operates correctly under conditions that closely align with its intended service. At this pressure, you can accurately assess if the valve will lift as designed and relieve pressure appropriately. Operating below this threshold could lead to an unreliable test result, as the valve may not lift or may not function effectively under normal operational conditions. Therefore, checking the safety valve at or above 75% of its set pressure is essential for verifying its performance and safety in a real-world scenario. This practice helps in maintaining the safety and integrity of the boiler or system it is protecting.