Kentucky HVAC Exam Prep FREE Sample Exam — Fixed Set

An accumulator-equipped system returns with a low crankcase oil level, a suction accumulator that is cold and heavy with liquid, and normal superheat at the evaporator outlet. What accumulator fault fits these findings?

The accumulator is installed in the liquid line instead of the suction line, which is why it is cold and full while the evaporator superheat remains normal

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The accumulator's oil-return orifice at the bottom of its U-tube is plugged

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The accumulator's internal U-tube has grown longer with age, so it now holds more liquid than the compressor crankcase can supply with oil during operation

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The accumulator is too small, because an undersized vessel returns oil to the compressor faster than a correctly sized vessel and empties the crankcase promptly

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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 fixed-orifice system’s suction pressure corresponds to an evaporator saturation temperature of 40°F, and the suction line at the evaporator outlet measures 52°F. What is the evaporator superheat?

12°F, found by subtracting the saturation temperature from the suction-line temperature

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92°F, found by adding the two temperatures

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52°F, because superheat equals the suction-line temperature itself, at the evaporator outlet coil

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40°F, because superheat equals the saturation temperature itself

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At commissioning, a combustion analyzer shows rising carbon monoxide and unstable readings as the furnace runs longer. What is the appropriate response?

Stop and investigate before leaving it in service

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Raise the gas pressure to burn the carbon monoxide more completely and recheck only if the customer reports symptoms later on

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Note the readings as normal break-in behavior for new exchangers and leave without further testing or documentation at all

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Disable the analyzer alarm and run the furnace longer, because extended operation usually cleans a new exchanger by itself fully

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A homeowner calls because the outdoor unit is steaming, the outdoor fan has stopped, and a whoosh was heard, while the unit is heating on a frosty morning. What should the technician explain first?

The compressor has failed and the unit should be shut off at the breaker immediately

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The refrigerant charge is escaping as steam and the area should be evacuated

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This is a normal defrost: the reversing valve shifted, the fan stopped, frost is melting into visible vapor, and the cycle will end and heating will resume in a few minutes

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The unit has mistakenly switched to cooling for the rest of the day

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With a blower door holding the house at -50 Pa with respect to outdoors, an attached garage zone reads -25 Pa with respect to outdoors. How should this zonal reading be interpreted?

The garage is connected only to the house, because any reading below zero means the zone has no openings at all to the outdoors or to other zones

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The garage is connected only to outdoors, since an intermediate reading is produced when a zone is fully vented and the gauge averages house and outdoor pressure

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Garage connects to both sides

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The reading is a gauge error, because a zone can only ever read either the full house pressure or zero, never a stable value in between the two

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Why are resistance temperature detectors (RTDs) often chosen for critical duct and water temperature sensing over basic thermistors?

They offer stable, repeatable accuracy over time and a wide temperature range, which suits trend and control decisions

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They need no wiring and transmit temperature by line pressure

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They change resistance so erratically from minute to minute that the controller must average hundreds of readings per second just to get a usable value

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They are always the lowest-cost sensor, so accuracy is not a factor in the choice

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A homeowner upgrades from a MERV 8 to a MERV 13 filter of the same size, and the system begins tripping the furnace limit and freezing the cooling coil. What is the most likely link?

The finer filter raised pressure drop and reduced airflow below what the equipment needs

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The MERV 13 filter added heat to the airstream

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The filter removed so many particles that the blower oversped

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Higher MERV filters always damage heating and cooling equipment whenever they are installed, regardless of filter size, airflow, or the system's actual pressure drop

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A balancer finds a zone that cannot reach design airflow even with its dampers fully open, while the fan and other zones have capacity to spare on paper. What is the most professional handling in the report?

Record the design value as achieved so the report shows full compliance

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Document the shortfall with measured data, identify the apparent restriction or design limitation, and refer it for correction rather than falsifying a passing value

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Close the dampers serving several other zones permanently so air is forced into the short zone, and report that forced condition as the final balanced result for the whole system

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Omit the zone from the report so the deficiency is not visible

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Why does the furnace or air handler blower matter to a cooling system’s rated combination?

The blower matters only for heating season, because cooling capacity is set entirely at the outdoor unit and airflow is secondary

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Blower airflow across the coil is part of the tested combination, and wrong airflow changes capacity, efficiency, and dehumidification

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A stronger blower always raises the rating, so oversizing the air handler is a reliable way to gain extra efficiency points

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Blower selection affects only noise level, since the coil removes the same moisture regardless of the air volume crossing it

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An applicant offers two years of approved HVAC curriculum to satisfy the journeyman experience requirement. How much credit is allowed?

Both years, because approved education substitutes without limit for journeyman employment experience

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One year at most — approved curriculum or training credit toward the journeyman requirement is capped at one year

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No credit, because education and training can never count toward any Kentucky HVAC experience requirement

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One year toward the master requirement only, because curriculum credit is unavailable for journeyman applicants as provided in the department guidance governing this transaction.

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A gas piping system serves appliances totaling 200,000 Btu per hour input. The gas has a heating value of about 1,000 Btu per cubic foot. The design flow the piping must deliver is:

200 cubic feet per hour, found by dividing the total input of 200,000 Btu per hour by 1,000 Btu per cubic foot

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20 cubic feet per hour, found by dividing the total input by the heating value and then again by a factor of ten

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2,000 cubic feet per hour, found by multiplying the total input in thousands by the heating value in thousands

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100 cubic feet per hour, found by assuming only half the appliances can ever operate at the same time by code

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Kentucky HVAC Exam Prep FREE Sample Exam — Fixed Set

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