EstatePass

HVAC Systems — Texas ACR A Practice Questions

22 questions · 9% of the Texas ACR A exam

Worked questions

1. A restaurant is installing a new walk-in refrigerator. The manufacturer specifies a 7.5-ton refrigeration system. According to the 2024 UMC, what is the minimum size of the disconnecting means required for this system?

  • A50A
  • B60A
  • 70A
  • D80A

Exam tip

Always round up when calculating the minimum size of disconnecting means.

Why C is correct

The 2024 UMC Section 410.4 requires a disconnecting means rated not less than 125% of the nameplate rating of the refrigeration system. For a 7.5-ton system, the minimum rating is 9.375 tons, which corresponds to a 70A disconnecting means.

3. How often should the air filters in an office building's HVAC system be replaced or cleaned?

  • Every 3 months
  • BEvery 6 months
  • CEvery 12 months
  • DEvery 18 months

Exam tip

Regular maintenance is key to ensuring good indoor air quality and efficient operation of HVAC systems.

Why A is correct

The correct answer is every 3 months, as recommended in the ACCA Manual D. Regular filter maintenance is crucial for maintaining air quality and system efficiency. The other options are less frequent and may not maintain optimal air quality.

5. In an industrial workplace, what is the minimum exhaust air velocity required to prevent the accumulation of dust and fumes as per the Texas Administrative Code, Chapter 75, Rule 75.201?

  • A100 fpm
  • 150 fpm
  • C200 fpm
  • D250 fpm

Exam tip

Exhaust air velocity is a critical factor in maintaining a clean and safe industrial environment.

Why B is correct

The Texas Administrative Code, Chapter 75, Rule 75.201 mandates a minimum exhaust air velocity of 150 fpm to effectively remove dust and fumes from industrial workplaces, ensuring a safe environment.

16 more in the bank

Answers and explanations for these are in the app.

  • A school is renovating its classrooms and wants to ensure adequate ventilation. According to the Texas Administrative Code Chapter 75, what is the minimum outdoor air ventilation rate required for classrooms?
  • A Texas Environmental Air Class A contractor is installing a new kitchen exhaust system in a residential building. The system is designed to exhaust 1,200 cfm of air. What is the minimum required size of the exhaust fan, in square inches, according to the 2024 IMC?
  • An office building is being designed with a VAV system. The total cooling load for the building is 1,000 tons. According to the ACCA Manual J, what is the minimum number of cooling coils required if the system has a 1.5 cooling coil efficiency?
  • In a commercial building, the HVAC system is designed to provide 100% outdoor air ventilation. The system has a total of 10 supply diffusers. According to the 2024 IFGC, what is the minimum number of exhaust air outlets required if the total supply air is 10,000 cfm?
  • In a hospital, the HVAC system is designed to provide a specific airflow pattern in operating rooms. According to the 2024 IMC, what is the minimum velocity required for the supply air in these rooms?
  • In an industrial facility, what is the recommended temperature rise across the cooling coils to prevent freezing conditions as per the 2024 UMC, Section 1806.3?
  • What is the maximum allowable air flow noise level for air conditioning systems as per ACCA Manual D, Section 8.4?
  • What is the maximum allowable velocity for supply air ducts in an industrial facility according to the 2024 IFGC Section 601.3?
  • What is the minimum exhaust air flow rate required for a commercial kitchen exhaust system according to the 2024 IMC Section 403.3.1?
  • What is the minimum heating system efficiency required for a school building according to the 2024 IMC Section 901.2.1?
  • What is the minimum outdoor air supply required per person in a residential bedroom as per the 2024 IMC, Section 403.4?
  • What is the minimum outdoor air ventilation rate required for a bedroom in a residential building according to the 2024 IMC Section 403.3.1?
  • What is the recommended humidity level for a museum's HVAC system to prevent damage to artifacts?
  • What is the standard pressure for the high-pressure side of a refrigeration system as per Modern Refrigeration and Air Conditioning 22nd ed., Chapter 5?
  • Which type of air distribution system is typically used in a commercial kitchen to handle high heat loads?
  • Which type of air filter is most commonly used for maintaining air quality in commercial HVAC systems as per the 2024 IFGC, Section 601.4?

Practice all 22 HVAC Systems questions

Plus timed mock exams and a wrong book that follows you between the web and the app.

Start studying free

Other Texas ACR A content areas