Ohio HVAC Exam Prep FREE Sample Exam — Fixed Set

An electronic expansion valve system holds superheat poorly after a controller replacement. The pressure transducer reads correctly, but the temperature sensor strapped to the suction line is loose and reading warm room air part of the time. What will the controller tend to do?

It will calculate superheat that is too low and close the valve completely, because a warm sensor makes the suction vapor appear colder than it really is

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It will calculate superheat that is too high and open the valve too far, risking floodback

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It will ignore the temperature input entirely and hold the valve at a fixed opening, because EEV controllers do not use suction temperature to compute superheat

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It will switch the stepper motor to reverse rotation permanently, because a loose sensor changes the electrical polarity seen by the controller inputs

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A homeowner reports the indoor blower starts at the exact instant the burners light and blows cold air for a long time. In a normal modern furnace sequence, when should the indoor blower start and stop relative to the burners?

It should start before the inducer motor begins its pre-purge and then stop again before ignition so the heat exchanger stays completely cold at light-off

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It should run continuously whenever the house is occupied

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It should start after a short heat-up delay following ignition and continue briefly after burner shutdown to harvest residual heat

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It should start only after the thermostat is fully satisfied

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A boiler’s burners shut off at the aquastat setting but the circulator continues to run and the rooms keep warming past the thermostat setting, with the thermostat no longer calling. Which interpretation best fits?

The aquastat has failed because it should also stop the circulator in every design

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Stored heat in the boiler and continued circulation can carry heat to the emitters after burner shutdown; control wiring and the circulator control must be checked against the designed sequence

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The expansion tank is forcing hot water into the radiators

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The low-water cutoff is overheating the building

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A designer specifies external insulation on a metal supply duct crossing a hot attic instead of an internally lined duct. Which pairing of benefits and cautions is correct?

External insulation raises airflow velocity so the duct can be downsized one full size

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External insulation leaves the full duct area open to airflow and keeps fibers out of the airstream, but its outer jacket must be sealed as a vapor barrier and protected where it can be damaged

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External insulation needs no vapor barrier because attic air is always dry

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Internal lining and external insulation perform identically in every respect, so the choice is purely cosmetic, with the same effect on duct free area, airstream cleanliness, vapor control, and long-term maintenance access whichever side of the metal the insulation is placed on

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A 24 V contactor coil measures 15 ohms. Using Ohm’s law, about how much current does the coil draw when energized?

0.63 A

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1.6 A

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39 A

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360 A

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A condensing furnace’s condensate drain has a long flat section that sags, and the furnace intermittently locks out with water backing up into the collector box. What correction best addresses the cause?

Raise the gas manifold pressure well above the manufacturer's specification so the furnace runs hotter and dries itself out from the inside during every cycle

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Plug the secondary drain port so water cannot back up

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Re-pitch the drain so it slopes continuously downhill to its termination, support it so it cannot sag, and keep required traps in place

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Connect the condensate line directly into a gas vent

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Winter inspection finds condensation and mold inside exterior wall cavities of a house whose indoor RH is high and whose envelope measures positive with respect to outdoors on the upper floor while the blower and exhaust systems run. What mechanism is at work?

Cold outdoor air is being drawn into the walls at the top of the house and condensing its moisture on the warm interior drywall surface

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Plumbing vents inside the walls are releasing sewer moisture that condenses on the cold sheathing in every exterior bay inspected

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Positive pressure drives vapor outward

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The wall insulation is absorbing moisture from the soil by capillary action through the foundation and releasing it at the upper floor cavities

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A 95% AFUE furnace is vented with PVC and produces a steady stream of water at its drain during heating. A homeowner worries the heat exchanger is leaking. What should the technician explain and verify?

Any water at the drain indicates a cracked heat exchanger, so the furnace must be condemned and shut down immediately without checking the drain, trap, or venting system

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Condensation is normal for this appliance; verify the condensate drain and trap are clear and properly routed

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The water is humidifier overflow and the furnace drain should be plugged

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PVC venting causes rain to enter, so the vent should be switched to B-vent

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A meter shows a capacitor in a de-energized unit still holding charge. What should the technician do before handling its terminals?

Touch both terminals together with bare fingers to drain off the stored charge as quickly as possible

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Safely discharge the capacitor through an appropriate resistor and verify zero volts

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Assume it drained because power is off

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Hit it with a screwdriver handle

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A new draw-through air handler on a cooling coil pulls air across the coil, so its drain pan is under negative pressure. It is piped with a straight pipe from the pan to the drain with no trap, and at startup air is sucked up the drain line and condensate overflows the pan. What was missed?

The drain needed a larger diameter so air could enter faster

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A trap of adequate depth is needed so its water seal resists the negative pressure and lets condensate drain instead of being held in the pan

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The pan needed a safety switch instead of any trap

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The drain should have been connected to the liquid line to equalize pressure, tying the condensate piping directly into the sealed refrigerant circuit so the two pressures balance each other at startup

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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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A veteran licensee served on active duty for seven full months plus a partial eighth month during the current continuing education reporting period, well over thirty-one days in total. The licensee requests the military continuing education extension. How long is it?

The extension is one month, because the rule grants a flat thirty-day accommodation to every qualifying veteran regardless of the length of the active duty served.

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The extension is seven months, because only complete calendar months of active duty are counted and any partial month is discarded from the calculation.

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The extension is twelve months, because any active duty over thirty-one days earns a full reporting year of additional time to complete the education.

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The extension is eight months, because it equals the total months of active duty in the period and any part of a month counts as a full month.

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Ohio HVAC Exam Prep FREE Sample Exam — Fixed Set

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