CSLB Class B General Contractor's License Practice Exam

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Prepare for the CSLB Class B General Contractor's License Test with interactive flashcards and multiple choice questions. Each question offers hints and explanations to enhance your understanding and readiness for the exam.

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How often must a commercial backflow device be tested?

When replaced or annually
When replaced and annually
When installed and every other year
When repaired or every other year

The correct answer is: When replaced and annually

A commercial backflow device must be tested when replaced and annually to ensure it is functioning properly and to prevent any potential contamination of the potable water system. Regular testing is crucial because backflow devices are designed to protect public health by preventing the reverse flow of water, which can carry harmful contaminants into the drinking water supply. Testing annually helps identify any issues that may affect the device's performance. Additionally, requiring testing upon replacement ensures that a new or repaired device is functioning correctly from the start, maintaining the integrity of the water system. Regular upkeep as specified is essential in commercial settings where the risk of backflow might be greater due to various factors, including the complexity of plumbing systems and environmental influences. Options that suggest less frequent testing would not adequately safeguard health and safety, as they fail to account for the potential changes in device performance over time or after significant repairs.