G2 Gas Fitter Practice Exam

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Prepare for the G2 Gas Fitter Test. Study using flashcards and multiple choice questions, with hints and detailed explanations for each question. Ensure your success!

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Which device is considered a draft control device in an appliance?

A thermostat
A draft hood or draft regulator
A pressure relief valve
A heat exchanger

The correct answer is: A draft hood or draft regulator

A draft control device is essential for maintaining proper ventilation and combustion safety in gas appliances. The draft hood or draft regulator directly controls the draft by managing the flow of flue gases and ensuring that they are properly vented to the outside atmosphere. This device helps prevent back drafting, which can lead to hazardous conditions within the appliance due to insufficient airflow or the accumulation of dangerous gases. By automatically adjusting to changes in the pressure differential between the appliance and the chimney, the draft hood/regulator helps to ensure consistent performance and safety. Understanding this function is crucial for gas fitters, as it contributes significantly to the overall efficiency and safety of gas-burning appliances. In contrast, a thermostat is primarily involved in regulating temperature, a pressure relief valve is designed to release excess pressure for safety, and a heat exchanger transfers heat without mixing fluids, but none of these devices specifically control draft in the same way that a draft hood or draft regulator does.