Georgia HVAC Exam Prep FREE Sample Exam — Fixed Set

A walk-in system is started on a cold morning after sitting off all weekend. At startup the oil foams violently, oil pressure fluctuates, and a loud knocking is heard for several seconds. What event best explains this startup behavior?

Refrigerant that migrated to the crankcase boiled off and liquid was drawn toward the cylinders

Correct Incorrect Correct answer

The discharge check valve opened too slowly, so hot gas backed up through the oil pump and aerated the oil from the top of the crankcase downward

Correct Incorrect Correct answer

The expansion valve opened fully at startup as designed, and the resulting normal superheat at the compressor caused the oil to foam in the sight glass

Correct Incorrect Correct answer

The condenser fans started before the compressor, lowering head pressure so much that the oil pump cavitated on cold, thick oil for the first minute

Correct Incorrect Correct answer

A homeowner asks why the new R-454B air handler runs its blower for a while after a leak sensor trips, even though cooling has stopped. What is the correct explanation?

The blower is removing residual heat from the electric heat strips, a normal cool-down sequence that happens to coincide with the sensor alarm event

Correct Incorrect Correct answer

The blower pressurizes the duct system so refrigerant vapor is forced back through the leak point into the coil, resealing the system temporarily

Correct Incorrect Correct answer

The blower dilutes and disperses leaked refrigerant through the duct system so room concentration stays low

Correct Incorrect Correct answer

The blower run is a fault in itself, because mitigation design requires the air handler to shut down every moving part the instant a sensor trips

Correct Incorrect Correct answer

Before handling the terminals of a run capacitor that was just removed from a running system, what must a technician do?

Nothing, because capacitors discharge instantly when power is removed

Correct Incorrect Correct answer

Short the terminals together with an insulated screwdriver held in a bare hand as the standard method, as the preferred shop method

Correct Incorrect Correct answer

Discharge the capacitor safely (for example through a resistor) and verify with a meter that no charge remains

Correct Incorrect Correct answer

Reconnect it to the motor briefly so the motor windings drain the charge

Correct Incorrect Correct answer

A heat pump in a cold climate knocks and gurgles for the first two minutes of morning starts, and its oil sight indications suggest foaming at startup. The compressor sump is cold to the touch at 28 degrees F ambient after an overnight off period, and the crankcase heater measures open circuit. By mid-run the noises stop and pressures normalize. What is the most likely cause?

An overcharge of refrigerant flooding the compressor continuously, which would keep suction superheat low and noises present through the whole run rather than only the first two minutes

Correct Incorrect Correct answer

Refrigerant migration to the cold compressor during the off cycle

Correct Incorrect Correct answer

A reversing valve leaking internally, which would waste capacity and warm the suction line during operation rather than create startup-only foaming that clears as the compressor warms

Correct Incorrect Correct answer

Low indoor airflow frosting the outdoor coil in heating, which would raise frost and defrost frequency instead of filling the crankcase with liquid while the unit sits off

Correct Incorrect Correct answer

A hydronic loop is filled with 50% propylene glycol where 30% would provide the needed freeze protection. Compared with water, the excess glycol will most likely:

Lower heat output and raise pumping work, because excess glycol is more viscous and carries less heat per gallon, while adding unnecessary cost

Correct Incorrect Correct answer

Increase heat transfer and reduce circulator load

Correct Incorrect Correct answer

Have no effect on system performance at any concentration

Correct Incorrect Correct answer

Eliminate the need for corrosion inhibitors in the loop

Correct Incorrect Correct answer

An installer is sealing a medium-pressure supply trunk that runs through an unconditioned warehouse. Why does this duct warrant more rigorous sealing than a short low-pressure run inside the conditioned space?

Higher-pressure duct is made of thinner metal, so the sealant is needed to hold the duct together structurally, with the mastic carrying the joint load and keeping the sections aligned under pressure in place of heavier fasteners or added reinforcement

Correct Incorrect Correct answer

Higher internal pressure drives more leakage through every unsealed seam, and air leaked outside the conditioned space is a total energy loss rather than a partial one

Correct Incorrect Correct answer

Sealing matters less at higher pressure because the pressure forces mastic into the gaps

Correct Incorrect Correct answer

Duct in unconditioned space only needs sealing at the registers, since trunk seams do not leak

Correct Incorrect Correct answer

A wall-mounted carbon dioxide sensor for demand ventilation is installed directly in the supply-air discharge stream of a diffuser. What problem does this create?

It over-reads carbon dioxide because supply air leaving the diffuser carries the highest carbon dioxide concentration found anywhere in the room

Correct Incorrect Correct answer

It will be damaged by carbon dioxide, which is corrosive to sensor elements at room levels

Correct Incorrect Correct answer

It has no effect, because concentration is identical at every point in the room at all times

Correct Incorrect Correct answer

It samples diluted supply air instead of room air, so it under-reads occupancy and the space gets under-ventilated

Correct Incorrect Correct answer

A furnace clocks at an input 20% above its rating plate after a gas-valve replacement. The most likely setup causes are:

Manifold pressure set too high or wrong-size orifices installed

Correct Incorrect Correct answer

A vent connector one size larger than the minimum, because a larger vent increases draft and pulls extra gas through the burner orifices

Correct Incorrect Correct answer

A sediment trap with a long capped leg, because the trap volume adds a reserve of gas that the meter counts as additional furnace input

Correct Incorrect Correct answer

A thermostat set several degrees above room temperature, because a larger temperature difference makes the gas valve deliver more fuel per hour

Correct Incorrect Correct answer

Why do traditional combustion air methods provide two openings, one high and one low, between a furnace room and the rest of the building or outdoors?

Both openings are drains for condensate from the appliance

Correct Incorrect Correct answer

The high opening lets hot air and flue-related gases escape the enclosure while the low opening supplies cooler combustion air

Correct Incorrect Correct answer

The high opening is provided for cooling-season supply airflow and the low opening serves as the return-air path back to the air handler for the rest of the house

Correct Incorrect Correct answer

Two openings are required only so one can be blocked as a spare

Correct Incorrect Correct answer

A shop reviews a year of callbacks and finds most return visits trace to a handful of causes: missed drain problems, untested safeties, and rushed startups. What is the most valuable use of this analysis?

Blame whichever technician has the most callbacks and change nothing else

Correct Incorrect Correct answer

Change the startup and quality-check process to attack those recurring causes, then track whether callback rates fall

Correct Incorrect Correct answer

Extend every equipment warranty silently for another full year so that callbacks cost the customer less paperwork and no one has to examine why the failures keep recurring

Correct Incorrect Correct answer

Stop recording callbacks so the rate appears to improve

Correct Incorrect Correct answer

A homeowner finished a 400-square-foot addition served by the existing system and now wants a changeout. What design step is required before selecting equipment?

A new load calculation covering the enlarged conditioned space, rather than sizing from the original home alone

Correct Incorrect Correct answer

No calculation, because additions under 500 square feet are absorbed by the safety factor built into every residential system

Correct Incorrect Correct answer

Sizing by the addition's square footage at the same tons-per-square-foot ratio the original installer used decades ago

Correct Incorrect Correct answer

Selecting equipment one full ton larger than the old unit, which reliably covers any addition of this general size

Correct Incorrect Correct answer

At a Georgia job’s design friction rate, the duct chart values the designer is using for round branch ducts are: 6-inch = 110 cfm, 7-inch = 160 cfm, 8-inch = 230 cfm. A family room branch must deliver 185 cfm. Which size does the design select?

6-inch, because the smallest duct that produces high discharge velocity gives the room the best air mixing at the register

Correct Incorrect Correct answer

8-inch, because it is the smallest listed size whose chart capacity at the design friction rate meets the required 185 cfm

Correct Incorrect Correct answer

7-inch, because its chart capacity may be exceeded by up to twenty percent before the next size is required by the method

Correct Incorrect Correct answer

10-inch, because branch ducts are routinely selected two sizes above the calculated need to leave room for future additions

Correct Incorrect Correct answer

Georgia HVAC Exam Prep FREE Sample Exam — Fixed Set

Quiz Summary

Information

Results

Results

Categories

1. Question

2. Question

3. Question

4. Question

5. Question

6. Question

7. Question

8. Question

9. Question

10. Question

11. Question

12. Question

Programs

Company

Legal

Account