Canadian Entry To Practice (CETP) Practice Test

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Which component is essential for overfilling prevention in certain propane cylinders?

A pop-off valve
An overfilling prevention device (OPD)
A safety relief valve
A manual shut-off valve

The correct answer is: An overfilling prevention device (OPD)

The essential component for overfilling prevention in certain propane cylinders is an overfilling prevention device (OPD). This device is specifically designed to ensure that propane cylinders are not filled beyond their safe capacity. It does this by incorporating a mechanism that automatically stops the filling process when the liquid propane reaches a certain level, which is vital for preventing dangerous pressure build-up and potential explosions caused by overfilling. While other options serve important functions—such as providing relief in case of excessive pressure or allowing for manual control of gas flow—they do not specifically address the prevention of overfilling in the manner that an OPD does. Therefore, the OPD is crucial in promoting safety and compliance with regulations surrounding the filling of propane cylinders.