Minnesota Boiler License Practice Exam

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Study for the Minnesota Boiler License Exam. Deepen your knowledge with expertly designed flashcards and multiple choice questions, each complete with helpful hints and detailed explanations. Get prepared for your licensing success!

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What is the purpose of the siphon or pigtail on a steam boiler?

To let steam leave the boiler
To drain water from the boiler
To protect the steam gauge from excessive temperature

The correct answer is: To protect the steam gauge from excessive temperature

The siphon or pigtail on a steam boiler primarily serves the purpose of protecting the steam gauge from excessive temperature. Steam gauges can be sensitive to high temperatures that may affect their accuracy and functionality. The siphon creates a U-shaped bend that holds a small amount of water, which acts as a barrier between the steam and the gauge, thereby preventing the high-temperature steam from directly entering the gauge mechanism. This design ensures that the gauge can accurately reflect the steam pressure without being damaged by heat. In contrast, the other options describe functions that do not correspond to the role of a siphon or pigtail. For instance, while managing steam pressure is vital, allowing steam to leave the boiler is not the purpose of the siphon. Similarly, draining water from the boiler relates more to different components that address water level management, rather than the protective role of the siphon related to temperature regulation of the gauge.