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Piping — Texas ACR A Practice Questions

12 questions · 5% of the Texas ACR A exam

Worked questions

1. A crawl-space exercise specifies net free vent area equal to 1/150 of its 1,500 ft² floor area. What net free vent area follows from that supplied ratio?

  • A1 ft²
  • 10 ft²
  • C150 ft²
  • D225,000 ft²

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why B is correct

1,500 / 150 = 10 ft² of net free opening. Floor area, not perimeter length, is the input. The ratio is an explicit exercise assumption, not a determination of the applicable vented or unvented crawl-space provisions.

2. A chemical-process line must carry 500 gpm and has a stated operating pressure of 150 psi. No fluid properties, route length, fittings or allowable pressure-loss and velocity criteria are supplied. Which pipe diameter is established by these facts alone?

  • AExactly 2 inches
  • BExactly 3 inches
  • No unique diameter can be selected from these facts alone.
  • DExactly 5 inches

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why C is correct

Hydraulic sizing depends on the fluid and allowable velocity and pressure loss over the actual piping route. Operating pressure is also relevant to pressure rating, but it is not the available friction-loss allowance. The stated data do not justify a unique 4-inch diameter.

3. OSHA guidance notes that ammonia, especially with moisture, attacks certain metals. Which listed material is unsuitable for ammonia refrigeration piping because of this compatibility concern?

  • AProperly specified carbon steel
  • BProperly specified ammonia-compatible stainless steel
  • Copper
  • DAnother material specifically approved for the ammonia service conditions

Where to look it up

https://www.osha.gov/etools/ammonia-refrigeration/ammonia

Why C is correct

Ammonia can attack copper, so copper is not a suitable choice. Material compatibility, pressure rating, joining and other design conditions must all be verified; identifying an incompatible material does not approve an entire piping installation.

4. A cleanroom project specifies a HEPA filter rated to remove at least 99.97% of particles at 0.3 micrometers. Which submittal matches that stated performance?

  • AA filter labeled MERV 13 with no HEPA performance documentation.
  • BA coarse prefilter without a particle-efficiency rating.
  • CA screen rated only for insect exclusion.
  • A HEPA filter documented at 99.97% efficiency at 0.3 micrometers.

Where to look it up

https://www.cdc.gov/infection-control/hcp/environmental-control/air.html

Why D is correct

Match the submittal to the specified particle size and efficiency. CDC describes this HEPA performance; the question does not assign a universal filter requirement to every cleanroom.

5. Refrigerant piping penetrates a fire-rated wall. What should determine the permitted annular space and sealing details?

  • AA universal one-inch gap for every wall
  • The approved firestop system for that wall, penetrant and installation
  • CAny unsealed three-inch gap
  • DOnly the pipe color

Where to look it up

https://www.ul.com/news/firestop-systems-important-line-defense-fire-safety

Why B is correct

Use an approved firestop system matching the wall assembly and piping penetration. Its installation details govern the annular space and seal. A generic gap or filler does not demonstrate that the wall rating is maintained.

6. The approved ductwork specification requires all joints to be sealed. Inspection finds an unsealed joint. What action meets that stated requirement?

  • Seal the joint using the specified approved method.
  • BLeave it open if the gap is under 1/4 inch.
  • CLeave it open if the gap is under 1/2 inch.
  • DIgnore the joint if the fan still runs.

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why A is correct

An unsealed joint does not meet the stated sealing specification and must be corrected using the specified method. This does not assert that every installed duct system has literally zero leakage or replace applicable leakage testing.

7. A project inspection procedure requires potential defects to be documented and referred for qualified assessment. An inspector finds visible corrosion on refrigerant piping. Which action follows that procedure?

  • AOrder a complete replacement of the piping system
  • Issue a notice of deficiency
  • CPerform a visual inspection only
  • DRequest a maintenance contract

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why B is correct

Document the observed corrosion as a potential deficiency and refer it for assessment and required corrective action. The observation alone does not establish that the whole system must be replaced. Urgent hazards require appropriate immediate controls; this question does not prescribe an IFGC enforcement procedure.

5 more in the bank

Answers and explanations for these are in the app.

  • A contractor is selecting piping materials for a high-temperature fluid system. Which material is most suitable for high-temperature applications according to the Texas Occupations Code Chapter 1302?
  • A hotel is planning to install a new fire protection system. Which type of fire sprinkler system is most suitable for a hotel according to the 2024 IMC?
  • A refrigeration system in a food service establishment is experiencing refrigerant leaks. Which type of refrigerant is most commonly used in commercial refrigeration systems according to the 22nd edition of Modern Refrigeration and Air Conditioning?
  • A residential complex is being designed with a refrigeration system that will be installed underground. Which factor should be considered most carefully during the design phase, according to the 2024 UMC?
  • An air conditioning system in an office building is malfunctioning. Which component is most likely the cause of the malfunction, according to the ACCA Manual D?

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