10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
The ACR exam has 125 questions and runs 4 hours.
These 10 free ACR questions are organized by exam domain, so you can see how each part of the Texas Air Conditioning and Refrigeration (ACR) Contractor License Exam blueprint is tested. Reveal the answer and explanation under each question.
After an air handler is commissioned, a bedroom receives its design supply airflow with the door open. With the door closed, the room rises to +8 Pa relative to the hallway, supply airflow falls, and the room warms. The only central return is in the hallway. What modification best addresses the root cause?
Correct answer: B - Add a properly sized dedicated return, jumper duct, or transfer path
An externally equalized TXV serves an evaporator with substantial pressure drop. The bulb is correctly mounted at the outlet, but the external equalizer was connected at the evaporator inlet/distributor instead of at the suction outlet. Under load, the coil starves and outlet superheat rises. What best explains the condition?
Correct answer: A - The equalizer senses excessive pressure, adds closing force, and underfeeds the coil
A walk-in reaches setpoint, the liquid-line solenoid de-energizes, and the compressor pumps down normally to low-pressure cutout. During the off cycle, suction pressure rises and the compressor restarts briefly every few minutes. The line immediately downstream of the de-energized solenoid becomes cold, and a downstream sight glass shows intermittent liquid movement. This evidence most strongly points to:
Correct answer: C - A liquid-line solenoid leaking through its seat
A Manual J cooling load is 36,000 Btu/h total, including 27,000 Btu/h sensible and 9,000 Btu/h latent. At design conditions, a single-stage matched system delivers 39,800 Btu/h total, 31,000 Btu/h sensible, and 8,500 Btu/h latent. The selection rule permits 95% to 115% of total load but requires both sensible and latent capacity to meet their respective loads. How should the contractor evaluate this selection?
Correct answer: C - Reject it because latent capacity is below the calculated latent load
On a cold, humid morning, a heat pump initiates defrost while the thermostat still calls for heat. The reversing valve shifts temporarily to cooling, the outdoor fan stops, auxiliary heat energizes, and the outdoor coil warms enough to melt frost. The technician should recognize that:
Correct answer: A - This is a normal heat-pump defrost sequence
A supermarket rack operates normally in warm weather. In low ambient, the floating-head controller drives condensing pressure down until distant case liquid lines flash and the TXVs starve. Receiver level and condenser-outlet subcooling are normal, and line sizing has been verified. The most appropriate control correction is to:
Correct answer: D - Raise the minimum head setpoint enough to preserve liquid-line and TXV differential
An R-717 machinery-room alarm is sounding, and a worker is visible on the floor inside. A strong ammonia odor is present at the doorway. The responding technician has no SCBA, supplied-air respirator, or retrieval equipment. The first action is to:
Correct answer: D - Stay out, summon trained rescue, and use remote emergency controls under the site plan
A stabilized TXV system has low suction pressure, normal-to-low head pressure, 29°F superheat, and 19°F subcooling against a 10°F target. Airflow and load are normal. The liquid line loses 8°F across the filter-drier, and frost begins at the drier outlet. The complete pattern indicates:
Correct answer: C - A restricted liquid-line filter-drier
A Texas Class B Environmental Air contractor is asked to replace four independent 10-ton rooftop units at one building. Each unit is a complete, separate system. Under the Class B capacity rule, the contractor may:
Correct answer: B - Replace all four because the 25-ton limit applies to each complete individual unit
An appliance listing states that the vent operates at positive static pressure and that flue gases are likely to produce excessive condensate during steady operation. The required vent is:
Correct answer: D - A Category IV gas-tight, corrosion-resistant vent with condensate management
The ACR exam also covers these domains. Drill them in the full free practice test:
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