Ontario Operator-in-Training (OIT) Practice Exam

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Study for the Ontario Operator-in-Training (OIT) Exam. Sharpen your knowledge with flashcards, multiple choice questions, and detailed explanations. Be fully prepared for your licensing exam!

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When flushing a water main, operators must ensure that nearby pressure does not drop below what value?

100 kPa
140 kPa
200 kPa
250 kPa

The correct answer is: 140 kPa

During the process of flushing a water main, it's crucial that operators maintain nearby pressure to ensure adequate service and protect the integrity of the water system. The accepted standard for the minimum pressure must not drop below 140 kPa. This pressure threshold is important because it protects the system from potential issues, such as backflow or contamination, which can occur if the pressure drops too low. Maintaining pressure above this level ensures that water can effectively flow to consumers and prevents any adverse effects on their service. The pressure threshold of 140 kPa is considered adequate for most residential and commercial applications, ensuring that water remains available and that the quality of service is sustained even during maintenance activities like flushing. Keeping the pressure above this value also protects against structural strain on the water pipeline system that can arise from rapid changes in pressure.