Virginia HVAC Exam Prep FREE Sample Exam — Fixed Set

A mountain-town home at 6,000 feet has high summer humidity during monsoon weeks and long mild shoulder seasons. Which equipment reasoning best fits all three conditions together?

Pick the largest single-stage unit available so altitude losses are covered by raw tonnage, accepting short shoulder-season cycles as a minor comfort tradeoff overall

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Size by nameplate sea-level capacity alone, because humidity control and part-load behavior matter far less at elevation than they do for lowland installations nearby

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Use derated capacity, favor modulation for part load and humidity control

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Choose equipment by its heating rating first and let cooling size fall where it may, since mountain homes are heating-dominated and summer loads rarely govern equipment selection

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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

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

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

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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

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A system has correct refrigerant readings for its metering type but a temperature split of only 11°F across the evaporator on a humid day with a heavy latent load confirmed normal. Static pressure is low and the blower is set one tap higher than specified for the installed coil. Which explanation best fits a persistently low sensible split after the latent load is accounted for?

Excessive airflow moving air across the coil too fast for full sensible heat exchange per cubic foot

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A refrigerant undercharge, which always lowers the temperature split first, before any other measurement is taken on the system

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A clogged condensate drain raising the coil temperature

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A TXV sensing bulb that has completely lost its charge

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A cabin hydronic system uses glycol for freeze protection and is serviced after five years with no fluid records. The essential fluid checks before winter are to test:

Only the water pressure at the boiler gauge, checked once while the system is hot and again after it cools, with no testing of the glycol itself if the pressure has remained stable since the last service visit

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Only the color of the fluid against a new sample

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Freeze-point concentration with a refractometer and inhibitor/pH condition, topping up or replacing fluid whose freeze or corrosion protection has degraded

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Glycol ratio by measuring boiler stack temperature

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A homeowner wants a much finer filter, but the existing 1-inch filter rack already shows a high clean-filter pressure drop and airflow is marginal. What is the soundest way to gain filtration without starving the system?

Install the finer filter and raise blower speed two taps, because higher speed always restores airflow without any penalty in noise, energy use, or coil velocity

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Increase filter face area

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Remove the filter during mild weather to bank static-pressure margin, then reinstall the fine filter only for the hottest weeks of the cooling season

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Stack two fine filters in series in the same rack so each one catches part of the load, which lowers the combined pressure drop compared with a single filter

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A gas appliance has an input rating of 132,000 Btu/h, and the gas supply delivers about 1,000 Btu per cubic foot. What volume of gas must the piping deliver to the appliance each hour?

13.2 cubic feet per hour, because the input is divided by 10,000 to convert Btu directly into piping flow units

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66 cubic feet per hour, because only half the nameplate input is used when converting a rating into hourly gas flow, on the theory that appliances draw only their average firing rate across a full day of operation

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132 cubic feet per hour, because the hourly input divided by the heat content per cubic foot gives the hourly volume

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1,320 cubic feet per hour, because an extra zero is added to account for the pressure drop along the piping run

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A Virginia HVAC candidate finds conflicting ventilation values in a 2018-edition study book and a 2021-edition code book. Which edition supplies the answers for code questions on the current Virginia tradesman HVAC examinations?

The 2018 edition, because either edition was acceptable when the transition period opened and older books remain usable until they wear out

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Whichever edition the candidate brought to the test center, because the bulletin allows any edition of a listed reference to be used for code questions

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The 2021 edition of the International Mechanical Code, the only edition keyed since May 1, 2025

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The Virginia Mechanical Code volume, because state-compiled books override the national code book on every Virginia licensing examination

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Windows condense heavily on cold winter mornings in a tight new home with a large family, showers, and cooking. Indoor humidity reads 48%. What is the most likely diagnosis?

The humidifier is undersized, so raising indoor humidity further will warm the window glass and stop the condensation from forming

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The windows are leaking refrigerant, because condensation on glass is a recognized sign of a cooling-system charge problem in winter

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The furnace is oversized for cooling, which explains winter window moisture even though the cooling system is not operating at all

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Indoor moisture generation exceeds removal, so humidity must be lowered and ventilation or exhaust increased rather than adding humidification.

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A replacement water heater is installed with no readily accessible gas shutoff valve serving it. What is required?

An accessible shutoff valve in the same room, within the prescribed reach of the appliance, ahead of its union or connector.

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A valve at the gas meter is sufficient for every appliance in the building, no matter how far the heater is from the meter location

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A shutoff is required only on appliances over a certain input, so smaller heaters may rely on turning off the main building valve

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The valve may be hidden behind the heater's jacket panel, provided a sticker on the front tells a technician that it is located inside

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All zones in a house are lukewarm. The boiler control display reads 182°F and stops firing, but a calibrated thermometer strapped to the supply pipe reads 143°F, zones call continuously, the circulator runs, and the boiler temperature sensor’s resistance measures well off its published chart for the actual water temperature. What is the most likely cause?

An aquastat/limit set too low by the installer, when the control believes it is reaching 182°F and the setting itself was verified correct

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A drifted boiler temperature sensor

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Air binding in every zone simultaneously, which would leave the boiler itself hot and short-cycling rather than genuinely producing 143°F water

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A failing circulator moving too little water, which is contradicted because a lazy circulator makes boiler water hotter, not cooler, than the display claims

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A job will cost $800 to perform. The contractor wants a 25% gross margin on the selling price, not a 25% markup on cost. What selling price achieves that margin?

$1,000.00, found by adding a 25 percent markup directly onto the $800 cost of the work

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$960.00, found by adding a 20 percent markup even though a different margin was requested

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$1,600.00, found by doubling the cost on the assumption that margin and markup are interchangeable terms

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$1,066.67

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After the Qualified Individual for the HVA specialty resigns and is replaced, within what period must the firm report the QI change to the Board on the Board’s form?

Within 30 days, the same period the rules give a firm to report a change in its licensed name or its principal place of business address

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Within 60 days, with the new Qualified Individual required to meet the class's qualified individual rule for the specialty covered

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Within 120 days, the same period the rules give a firm to report a change in its designated employee or in its firm principals

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At the next renewal only, because personnel changes in the qualified individual role are collected on the renewal form rather than reported

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Virginia HVAC Exam Prep FREE Sample Exam — Fixed Set

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