Water Distribution Operator Class IV Practice Questions - ABC WPI Water Distribution Operator Class IV Certification Exam

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What is the primary failure mode of pre-stressed concrete cylinder pipe (PCCP) commonly used for 24-inch and larger transmission mains?

Galvanic corrosion of the steel cylinder driven by anaerobic soil bacteria Loss of prestressing wires that allows the concrete core to fail under pressure Joint pull-out from soil settlement at transition couplings Internal abrasion from sand and grit at high transmission velocities

Correct Answer:

Loss of prestressing wires that allows the concrete core to fail under pressure

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