Air Systems Cleaning Specialist (ASCS) Practice Exam

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Prepare for the Air Systems Cleaning Specialist Exam. Study with flashcards and multiple choice questions, each question is accompanied by hints and explanations. Gear up for your certification!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What are the most common types of fuel consumed in modern residential HVAC systems?

Natural Gas, propane, and oil
Electric, propane, and oil
Natural gas, methane, and oil
Natural gas, Propane, and ethanol

The correct answer is: Natural gas, Propane, and ethanol

The most common types of fuel consumed in modern residential HVAC systems include natural gas, propane, and oil. These fuels are widely used due to their availability, efficiency, and effectiveness in heating residential spaces. Natural gas is a leading choice for many homeowners as it is not only efficient but also has a lower carbon footprint compared to oil. Propane serves as an alternative where natural gas lines are unavailable, and it performs effectively in various heating applications. Oil was traditionally prevalent and remains in use, especially in rural areas where other fuel sources may not be accessible. Ethanol, while a renewable fuel, is less common in residential heating applications compared to the other fuels mentioned. Therefore, stating that natural gas, propane, and ethanol are the primary fuels is inaccurate because ethanol does not commonly play a significant role in HVAC systems. Instead, the prevalent fuel sources are primarily focused on natural gas, propane, and oil due to their extensive infrastructure and usage in residential heating systems.