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The AL-REFRIG exam has 90 questions and runs 4 hours.
These 10 free AL-REFRIG questions are organized by exam domain, so you can see how each part of the Alabama Refrigeration Contractor Certification Exam blueprint is tested. Reveal the answer and explanation under each question.
At an evaporator outlet, a zeotropic refrigerant blend has a bubble-point temperature of 14°F and a dew-point temperature of 24°F at the measured pressure. An insulated contact probe at that same location reads 34°F. Operation is stable, and the specified outlet superheat range is 8-12°F. What superheat and valve-setting decision follow from these readings?
Correct answer: B - 10°F; leave the valve setting unchanged.
An installation specification limits suction-riser pressure loss to 2.0 psi at full load and requires at least 700 ft/min vapor velocity at minimum load for oil return. The manufacturer supplies the performance values below for four approved tubing sizes at the actual operating conditions. Select the riser that satisfies both requirements.
Correct answer: D - 1-1/8-in. OD: 1.5 psi full-load loss; 830 ft/min minimum-load velocity.
A freezer has a design load of 330,000 Btu per day, including evaporator-fan heat, defrost heat, and all required allowances. Refrigeration is available for 20 hours per day. The design evaporating temperature is -10°F at 100°F outdoor ambient. All four matched systems below are otherwise suitable; their gross refrigeration capacities, before subtracting fan heat, apply at 100°F ambient. Identify the smallest system that can meet the design load.
Correct answer: C - Model M: 24,000 Btu/h at +20°F evaporating; 18,000 Btu/h at -10°F evaporating.
After several hours at a steady load, a walk-in cooler remains too warm. Evaporator airflow and condenser airflow are normal. The direct-expansion system has no receiver. Evaporator superheat is 27°F against a specified 8-12°F range, and liquid subcooling upstream of the filter-drier is 17°F. Calibrated gauges show an 11-psi drop across the drier; its maximum permitted drop at this flow is 2 psi. Which fault best accounts for the combined findings?
Correct answer: C - A restricted liquid-line filter-drier.
A qualified technician checks a 24-V control circuit arranged in series: transformer, cooling thermostat, high-pressure safety, overload contact, contactor coil, and transformer return. Prior de-energized checks confirmed that the coil and connecting wires are intact. With a cooling call present, the source measures 24 V. The thermostat and overload contact each measure approximately 0 V across their terminals; the high-pressure safety measures 24 V, and the coil measures approximately 0 V. These readings identify which circuit condition?
Correct answer: A - The high-pressure safety contacts are open.
One office employee can create supplier accounts, approve invoices, release electronic payments, and reconcile the refrigeration company’s bank account. The owner reviews the monthly income statement but not individual payments. Which change most directly reduces the opportunity to pay a fictitious supplier?
Correct answer: A - Require independent owner approval of new suppliers and payment releases.
To bring a cold-storage project back on schedule, a manager can assign one additional qualified crew to one activity. The current schedule shows zero total float for refrigerant piping, three days for electrical rough-in, four days for equipment labeling, and five days for closeout documentation. Piping is on the only critical path, and added labor can shorten it without crowding or rework. Where will the extra crew directly advance the scheduled completion date?
Correct answer: C - Refrigerant piping, because shortening the critical path advances completion.
An owner offers $24,000 for a walk-in installation. The estimate includes $18,000 in materials and loaded labor plus $2,000 in allocated overhead, with no other costs or taxes. The contractor requires a 20% margin on the selling price after these costs. Which response gives the lowest price that meets that requirement?
Correct answer: A - Counter at $25,000 to achieve the required margin.
An ammonia alarm sounds in a refrigeration machinery room. From outside the room, an arriving service technician can see a fixed oxygen display reading 20.9%, but no ammonia concentration is available. The technician is not trained or equipped for emergency entry. What is the appropriate immediate action?
Correct answer: B - Keep people out and activate the site emergency response.
During a walk-in installation, a store manager asks the crew to move an evaporator to a different wall. The contract reserves change authority to the owner’s project director and requires a signed change order before changed work begins. No change order has been issued. The crew can continue installing unaffected supports without rework or a safety conflict. How should the contractor handle the request without creating an unnecessary project delay?
Correct answer: D - Obtain the signed change order while continuing unaffected contract work.
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