Practice Test Geeks(BPI) Building Performance Institute Certified Practice Test
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Heating, Ventilation & Air Conditioning (HVAC) Flashcards

7 cards from real BPI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Heating, Ventilation & Air Conditioning (HVAC) flashcards as text

  1. What is the purpose of measuring static pressure in an HVAC duct system?

    Answer: To assess airflow resistance and identify restrictions that reduce system performance

    Static pressure measurements reveal how much resistance exists in the duct system; high static pressure indicates restrictions that reduce airflow and system efficiency.

  2. Which refrigerant replaced R-22 as the standard for residential air conditioners due to lower ozone depletion potential?

    Answer: R-410A

    R-410A became the dominant replacement for R-22 in residential systems because it does not deplete the ozone layer, though it still has a high global warming potential.

  3. In a balanced ventilation system, what must be true about supply and exhaust airflows?

    Answer: Supply and exhaust airflows are approximately equal

    A balanced ventilation system maintains approximately equal supply and exhaust airflows to avoid pressurizing or depressurizing the building envelope.

  4. What is the function of an expansion valve (TXV) in a refrigeration cycle?

    Answer: To meter refrigerant flow and reduce pressure before the evaporator

    The thermostatic expansion valve (TXV) meters refrigerant flow into the evaporator and drops refrigerant pressure, enabling heat absorption at the evaporator coil.

  5. According to BPI standards, what CO level measured in ambient air during combustion appliance testing requires immediate action?

    Answer: 70 ppm

    BPI protocols require immediate action (stopping work, evacuating, notifying the homeowner) when ambient CO reaches or exceeds 70 ppm during testing.

  6. What does ACCA Manual J calculate?

    Answer: Heating and cooling loads for proper equipment sizing

    ACCA Manual J is the industry standard procedure for calculating residential heating and cooling loads to ensure equipment is properly sized for the structure.

  7. A technician measures a temperature difference of only 10°F across an evaporator coil during cooling mode. Normal split is 15–22°F. What is the MOST likely cause?

    Answer: Low refrigerant charge or restricted airflow across the coil

    A low temperature split (delta-T) across the evaporator typically indicates insufficient refrigerant charge or restricted airflow, both reducing heat transfer at the coil.