Florida HVAC Contractor Practice Test

Answer choices

1. A. Charge immediately because a new braze is automatically leak-free.
2. B. Pressure-test with oxygen because it provides faster bubble formation.
3. C. Pressure/leak test the repaired system with an appropriate inert test gas and method within equipment pressure limits, then evacuate if tight.
4. D. Run the compressor while the system is open to draw air through the repaired joint and treat that action as the corrective basis for the maintenance record.

Wrong-answer review

• A. Charge immediately because a new braze is automatically leak-free.: Incorrect. Brazed repairs should be verified before evacuation and charging.
• B. Pressure-test with oxygen because it provides faster bubble formation.: Incorrect. Oxygen under pressure around oil/brazing is hazardous.
• D. Run the compressor while the system is open to draw air through the repaired joint and treat that action as the corrective basis for the maintenance record.: Incorrect. Operating an open refrigeration system introduces contamination and can damage equipment.

Answer choices

1. A. Only heating load changes; solar gain cannot affect cooling.
2. B. Higher afternoon cooling load and zone imbalance, using the new fenestration properties and orientation in the load analysis.
3. C. No load change because HVAC load depends only on floor area.
4. D. Lower cooling load because glass always has less heat gain than insulated wall and carry that assumption into the final load or efficiency documentation.

Answer choices

1. A. Only the pump motor voltage, because electrical compatibility determines hydraulic performance.
2. B. Only the boiler input rating, because pump head is proportional to burner input.
3. C. Only the pipe diameter at the pump discharge, because diameter determines the correct pump size and carry that assumption through the final design calculation and submittal.
4. D. The system's required flow and total dynamic head at the design condition, checked against the pump curve.

Answer choices

1. A. Refrigerant becomes exempt from EPA requirements once it is placed in a recovery cylinder.
2. B. Adding virgin refrigerant to recovered refrigerant automatically makes the mixture reclaimed.
3. C. Recovered refrigerant can always be transferred between owners if it looks clear in a sight glass and use that repair approach before returning the equipment to normal service.
4. D. Recovered refrigerant that changes ownership generally must be reclaimed to the applicable purity standard before resale/reuse across owners, subject to EPA rules.

Answer choices

1. A. The system is within Class B scope only if its heating section is permanently disabled and no ventilation work is included.
2. B. The system exceeds Class B scope because any packaged cooling system above 15 tons requires a Class A air-conditioning license.
3. C. The system exceeds Class B scope because Class B contractors may install cooling equipment only in residential occupancies.
4. D. An 18-ton cooling system is below the Class B limit of 25 tons in any one system, so this capacity alone does not exceed Class B scope.

Answer choices

1. A. Energize briefly and use measured current to decide whether the voltage mismatch is acceptable.
2. B. Resolve the electrical-service and starter compatibility against the equipment nameplate, approved design and applicable electrical requirements before startup.
3. C. Bypass overload protection for the first startup so nuisance trips do not interrupt commissioning and record that configuration in the startup and turnover documentation.
4. D. Raise protective-device settings until the motor reaches full speed.

Answer choices

1. A. Raise the zone cooling setpoint so the excess airflow is less noticeable and treat that action as the corrective basis for the maintenance record.
2. B. Partially block the diffuser with cardboard and leave the faulty linkage.
3. C. Reduce central fan speed until that one zone reaches design.
4. D. Repair/adjust the actuator and linkage, calibrate the damper position/airflow control, then rebalance the terminal if needed.

Answer choices

1. A. Establish the lift plan and exclusion zone, verify rigging capacities and pick points, and keep personnel clear of the suspended-load path.
2. B. Allow pedestrians to pass beneath the load if the crane operator maintains radio contact.
3. C. Use any convenient cabinet opening as a tag-line attachment even if the manufacturer prohibits it and document that approach in the coordinated mechanical design package.
4. D. Increase hoisting speed so the suspended-load exposure time is shorter.

Answer choices

1. A. A dirty evaporator coil, because low airflow opens an electrical phase.
2. B. An oversized TXV, because valve position determines line voltage.
3. C. An electrical phase-loss/supply problem that must be corrected before attempting further compressor operation.
4. D. A refrigerant undercharge, because low charge removes one phase of voltage and use that conclusion to guide the remaining diagnostic measurements.

Answer choices

1. A. R-40, because the reciprocal must be doubled for cooling calculations.
2. B. R-20, because overall thermal resistance is the reciprocal of the overall U-factor.
3. C. R-0.05, because R and U use the same numerical value.
4. D. R-10, because the reciprocal must be divided by two for walls and document that approach in the coordinated mechanical design package.