<section><h2><h2><p><strong><span style="font-size:36px;">2023 ServiceTitan HVAC National Championship </span></strong></p><p><strong><span style="font-size:24px;">Round 1 Digital Qualifier</span></strong></p></h2><p><em>Presented by American Standard & Trane </em></p></h2><p><p><span style="font-size:12px;">Compete in a 5-minute digital challenge with questions provided by NATE once a day from Wednesday, March 1st through Monday, July 31<sup>st</sup>, 2023. </span><span style="font-size:12px;"></span><o:p></o:p></p><p><span style="font-size:12px;">Participants with the most correct answers will qualify to move on to Round 2 and compete for their chance at a trip to the finals in Tampa, FL. Ties will be determined by the least number of incorrect answers. When taking the test, the result from your first quiz attempt will count toward your entry for that day. </span><span style="font-size:12px;"></span><o:p></o:p><o:p></o:p></p><p><span style="font-size:12px;">Will you be our next ServiceTitan HVAC National Champion? </span><o:p></o:p></p></p></section><section><h2><h2>What is the volume of a rectangular space that has a length of 10', a width of 30', and a height of 10'?</h2></h2></section><section><h3><h2>What is the area of a rectangular flat surface that has a length of 10' and a height of 20'?</h2></h3></section><section><h3><h2>How many Btu does 1lb of water heated from 50°F to 65°F absorb?</h2></h3></section><section><h3><h2>Latent heat:</h2></h3></section><section><h3><h2>Warm air rising from a heat source is an example of what?</h2></h3></section><section><h3><h2>Sensible heat:</h2></h3></section><section><h3><h2>A fire extinguisher with a "B" classification will handle what kind of fire?</h2></h3></section><section><h3><h2>What are tubing benders used to bend?</h2></h3></section><section><h3><h2>What is the appropriate way to remove pin rivets (pop rivets)?</h2></h3></section><section><h3><h2>How can a technician prevent someone from turning on the power while they are working on a unit?</h2></h3></section><section><h3><h2>A technician notices an extension cord is missing a ground prong. What should the technician do?</h2></h3></section><section><h3><h2>What should be worn when working around airborne particles or caustic chemicals?</h2></h3></section><section><h3><h2>How should circuits always be treated?</h2></h3></section><section><h3><h2>When accessing an attic without a platform, what should a technician walk on?</h2></h3></section><section><h3><h2>When servicing an electrical system where the use of a ladder is required, which type of ladder should be used?</h2></h3></section><section><h3><h2>Which of the following is an effective method for reducing the sound transmissions from an air handler installed in a closet?</h2></h3></section><section><h3><h2>What is a property of using an oxy-acetylene compared to an air-acetylene system?</h2></h3></section><section><h3><h2>The manufacturer's instruction sheet specifies 0.5 ounces of refrigerant to be added for each added foot of refrigerant line length. How much refrigerant must be added to the system for 10 additional feet of line set?</h2></h3></section><section><h3><h2>When locating flexible duct in a crawlspace, the duct should be:</h2></h3></section><section><h3><h2>What is a supply plenum?</h2></h3></section><section><h3><h2>Which of the following statements is true of a recovery machine?</h2></h3></section><section><h3><h2>What steps are necessary to clean a stacked condenser coil?</h2></h3></section><section><h3><h2>What is the effect on supply airflow when the size of the return duct is decreased?</h2></h3></section><section><h3><h2>What must be prevented when bending soft copper tubing?</h2></h3></section><section><h3><h2>What is one reason for using a brazing alloy rather than soft solder when joining copper to copper?</h2></h3></section><section><h3><h2>What is the primary reason the oil must be changed often in a vacuum pump?</h2></h3></section><section><h3><h2>What is a digital manifold gauge set useful for?</h2></h3></section><section><h3><h2>What is the primary difference between a grille and a register?</h2></h3></section><section><h3><h2>What will be the effect of a "cross break" made on all sides of any rectangular section of metal?</h2></h3></section><section><h3><h2>Where are drive cleats typically installed on rectangular duct?</h2></h3></section><section><h3><h2>Where must the secondary condensate drain of an attic mounted horizontal air handler used with a heat pump be connected?</h2></h3></section><section><h3><h2>Which of the following is a likely problem if a heat pump has a high indoor temperature rise?</h2></h3></section><section><h3><h2>What is one instrument required for an accurate deep evacuation procedure?</h2></h3></section><section><h3><h2>What happens to heat pump capacity as outdoor temperature decreases?</h2></h3></section><section><h3><h2>When using acetylene, 15 psig is:</h2></h3></section><section><h3><h2>A loose fan belt will:</h2></h3></section><section><h3><h2>The 'R' value indicates the ability of insulation to do what?</h2></h3></section><section><h3><h2>What is the purpose of a nitrogen purge when brazing piping?</h2></h3></section><section><h3><h2>What could be caused by dirty condenser coils?</h2></h3></section><section><h3><h2>Why should oxygen NOT be used as a purging gas? </h2></h3></section><section><h3><h2>Which of the following is an advantage of an infrared thermometer?</h2></h3></section><section><h3><h2>What should a technician do after inserting two drives to connect two sections of duct together?</h2></h3></section><section><h3><h2>Which safety feature could prevent the operation of a gas furnace?</h2></h3></section><section><h3><h2>Why are humidifiers used with heating systems?</h2></h3></section><section><h3><h2>What is the purpose of using flux when soldering?</h2></h3></section><section><h3><h2>Which of the following would cause a heat pump system to short cycle?</h2></h3></section><section><h3><h2>What can a dirty or clogged air filter in an operating air conditioning system cause?</h2></h3></section><section><h3><h2>What is the primary purpose for using turning vanes in a rectangular elbow?</h2></h3></section><section><h3><h2>What is a duct transition?</h2></h3></section><section><h3><h2>Flexible duct should be supported at the manufacturer's recommended intervals, but should be supported at intervals no greater than how many feet?</h2></h3></section><section><h3><h2>Where should the liquid line filter-drier be located?</h2></h3></section><section><h3><h2>What is a critical step when installing the gauges on a unit?</h2></h3></section><section><h3><h2>What is a device used to charge a system with a specified number of ounces of refrigerant?</h2></h3></section><section><h3><h2>When the adjustment handle on a manual damper lies parallel to the airflow path of the ductwork, which of the following statements is true?</h2></h3></section><section><h3><h2>What should an installer do when reconnecting sections of round metal duct?</h2></h3></section><section><h3><h2>Which of the following is the correct method for cleaning an air distribution blower wheel?</h2></h3></section><section><h3><h2>Which of the following would be the appropriate tool to remove a threaded bolt with a ⅜" hex head?</h2></h3></section><section><h3><h2>Which of the following is the proper tool to mark a piece of sheet metal for drilling a pilot hole?</h2></h3></section><section><h3><h2>What tool is specifically made to thread a hole in metal?</h2></h3></section><section><h3><h2>What is the plate at the bottom of a wall to which the studs are attached called?</h2></h3></section><section><h3><h2>What is an exposed central support that runs parallel to the ceiling called?</h2></h3></section><section><h3><h2>How many inches is the on-center spacing of 2 x 4 load bearing wall studs used in residential construction?</h2></h3></section><section><h3><h2>What is the addition or removal of heat without a change in temperature known as?</h2></h3></section><section><h3><h2>What is the process of heat transfer by which gases and liquids move due to changes in temperature and/or pressure called?</h2></h3></section><section><h3><h2>What does the term 'continuity' indicate?</h2></h3></section><section><h3><h2>Which of the following is the recommended tool for cutting the opening in a metal cabinet?</h2></h3></section><section><h3><h2>Which of the following would be used to convey hazardous materials and treatment information to a technician?</h2></h3></section><section><h3><h2>When two objects (A and B) are in direct contact with each other, heat will flow from A to B if:</h2></h3></section><section><h3><h2>What do ceiling joists typically rest directly on?</h2></h3></section><section><h3><h2>Why should hacksaws never be used to cut copper tubing?</h2></h3></section><section><h3><h2>What is a reamer blade mounted on a tubing cutter used for?</h2></h3></section><section><h3><h2>A technician begins taking temperature readings at 1:00 PM. The readings are:</h2><h2>1:00 PM/74°F </h2><h2>2:00 PM/75.5°F </h2><h2>3:00 PM/77°F </h2><h2>If the trend continues, what reading would the technician expect at 4:00 PM?</h2></h3></section><section><h3><h2>What is oxidation?</h2></h3></section><section><h3><h2>When flaring copper tubing with too much starting height, the flare will:</h2></h3></section><section><h3><h2>What is the amount of heat that must be added to one pound of water to raise its temperature 1°F is called?</h2></h3></section><section><h3><h2>What is a Ground Fault Circuit Interrupter (GFCI)?</h2></h3></section><section><h3><h2>Which of the following is true of a DC circuit?</h2></h3></section><section><h3><h2>What is one effect of tighter home and building construction?</h2></h3></section><section><h3><h2>Whenever nitrogen is used for purging the technician must always be certain:</h2></h3></section><section><h3><h2>What happens when air moves too quickly through a filter?</h2></h3></section><section><h3><h2>Which of the following is an electrical load?</h2></h3></section><section><h3><h2>What can an undersized electrical conductor under load result in?</h2></h3></section><section><h3><h2>What can short cycling an A/C system result in?</h2></h3></section><section><h3><h2>What is a common cause of noise complaints?</h2></h3></section><section><h3><h2>What should be done prior to connecting the line voltage wiring to an indoor air handler or furnace?</h2></h3></section><section><h3><h2>Which of the following requires the use of flux with a silver brazing alloy?</h2></h3></section><section><h3><h2>What do the gauges on oxy-acetylene torch regulators display?</h2></h3></section><section><h3><h2>What can be caused by a loose line voltage connection?</h2></h3></section><section><h3><h2>A loose control voltage connection can cause which of the following problems?</h2></h3></section><section><h3><h2>What effect will slowing the evaporator fan have on moisture removal?</h2></h3></section><section><h3><h2>How many feet above a flat roof must a ladder extend when used to access the roof</h2></h3></section><section><h3><h2>Refrigerant vapors in high concentrations should not be inhaled as they:</h2></h3></section><section><h3><h2>What is power measured in?</h2></h3></section><section><h3><h2>What is electrical current measured in?</h2></h3></section><section><h3><h2>What can cause sweating windows and mildew on walls and furniture?</h2></h3></section><section><h3><h2>What will the voltage across a switch be when the contacts are closed?</h2></h3></section><section><h3><h2>What tool should be used to remove a sweat type filter-drier from a system?</h2></h3></section><section><h3><h2>Moisture within a structure flows from:</h2></h3></section><section><h3><h2>After a vacuum pump has been used, what does a continuous pressure rise in the system most likely indicate?</h2></h3></section><section><h3><h2>To capture moisture in a refrigerant system use a manufacturer's recommended:</h2></h3></section><section><h3><h2>When copper tubing is being brazed, nitrogen should be purged through the system to prevent:</h2></h3></section><section><h3><h2>In an air conditioning system, which of the following can cause head pressure to rise above the normal range?</h2></h3></section><section><h3><h2>A technician can calculate suction superheat in the cooling mode by taking two readings. One is the suction (or low side) pressure; the other is the</h2></h3></section><section><h3><h2>Which one of the following controls shuts down the compressor if the discharge line pressure becomes unsafe?</h2></h3></section><section><h3><h2>An oversized air conditioning system may result in increased:</h2></h3></section><section><h3><h2>An accurate room-by-room heat-loss/heat-gain calculation for a residential structure is necessary to determine proper:</h2></h3></section><section><h3><h2>Which of the following is an effect of cross breaking sheet metal duct?</h2></h3></section><section><h3><h2>What is subtracted from the static pressure to calculate velocity pressure?</h2></h3></section><section><h3><h2>A return duct in an unconditioned space has a significant leak, but the supply duct is properly sealed. This leak will cause:</h2></h3></section><section><h3><h2><strong></strong>What is the “boxlike” duct fitting that the air handler discharges air into called?</h2></h3></section><section><h3><h2>With a PSC blower motor, as supply dampers are closed in a duct system, static pressure:</h2></h3></section><section><h3><h2>After sealing a leaky duct system, what happens to static pressure at the end of the duct?</h2></h3></section><section><h3><h2>The two measurements needed to determine the CFM value are:</h2></h3></section><section><h3><h2>A technician is using a flexible rule that uses inches that are divided into 32 divisions. The technician is marking a length of tubing to 1/8 of an inch. How many divisions will be used to mark off the 1/8th of an inch?</h2></h3></section><section><h3><h2>The term that refers to the temperature at which moisture in the air begins to condense on objects is:</h2></h3></section><section><h3><h2>If the length of a wire is doubled, its measured resistance will:</h2></h3></section><section><h3><h2>Electronically commutated motors:</h2></h3></section><section><h3><h2>Which meter function should be used to determine if a limit switch is open or closed when the circuit is de-energized?</h2></h3></section><section><h3><h2>A vapor that has been heated above its boiling point is referred to as:</h2></h3></section><section><h3><h2>If the pressure switch on an induced draft gas furnace fails to close, what is the most likely cause?</h2></h3></section><section><h3><h2>On a gas furnace, which of the following conditions would cause the high limit control to trip?</h2></h3></section><section><h3><h2>On a gas furnace, floating flames are caused by:</h2></h3></section><section><h3><h2>Which of the following must be true if on an induced draft furnace, the inducer motor is running but has no ignition?</h2></h3></section><section><h3><h2>Without sufficient combustion air, the products of combustion will include higher levels of health-threatening:</h2></h3></section><section><h3><h2>What happens to heat rise across a heat exchanger as total CFM increases?</h2></h3></section><section><h3><h2>Some heating systems couple a heat pump with a fossil-fuel furnace. When starting such a system, an important operational check is to verify that the:</h2></h3></section><section><h3><h2>On start-up, a heat pump thermostat operating in heating mode should be checked to be sure that the:</h2></h3></section><section><h3><h2>Which of the following tools are required to adjust the charge of a heat pump by the superheat method?</h2></h3></section><section><h3><h2>A dirty air filter on a heat pump system will result in:</h2></h3></section><section><h3><h2>In an air-to-air heat pump in the cooling mode, the compressor runs, but the outdoor fan does not operate. There is nothing wrong with the fan motor or capacitor. Which of the following is most likely at fault?</h2></h3></section><section><h3><h2>Which of the following occurs when a heat pump is in the defrost mode?</h2></h3></section><section><h3><h2>During the cooling mode of a heat pump, condensate will drain from the:</h2></h3></section><section><h3><h2>Which of the following components is unique to heat pumps?</h2></h3></section><section><h3><h2>At the balance point of the structure, the heat-pump compressor should:</h2></h3></section><section><h3><h2>A dirty air filter on a heat pump system will result in:</h2></h3></section><section><h3><h2>Which of the following occurs when a heat pump is in the defrost mode?</h2></h3></section><section><h3><h2>During the cooling mode of a heat pump, condensate will drain from the:</h2></h3></section><section><h3><h2>A 230-volt single phase motor compressor fails to start and cuts off on the internal protection. Which of the follow readings suggests a cause for this problem?</h2></h3></section><section><h3><h2>The primary reason that frequent vacuum pump oil changes are recommended is because the oil:</h2></h3></section><section><h3><h2>What is an accurate formula for Ohm’s Law?</h2></h3></section><section><h3><h2>Which of the following can cause a gas burner system to be turned off by the high limit?</h2></h3></section><section><h3><h2>Which of the following shuts off when the heat pump goes into defrost?</h2></h3></section><section><h3><h2>When a heat pump is operating in the heating mode, why should pressure gauges be connected to the common suction and discharge access ports instead of those on the refrigerant lines?</h2></h3></section><section><h3><h2>Obstructed airflow through a filter in an electric furnace will cause:</h2></h3></section><section><h3><h2>For safety, prior to servicing an electric furnace and after turning off the unit disconnect, the technician should check:</h2></h3></section><section><h3><h2>During a service call, the technician finds a system with an abnormally high suction pressure and a low head pressure. This could be explained by:</h2></h3></section><section><h3><h2>When the compressor contactor is energized and its contacts are made, the potential difference across each closed contact (L1 to T1) is:</h2></h3></section><section><h3><h2>With a gas furnace installation, the preferred location for a non-bypass humidifier is the:</h2></h3></section><section><h3><h2>For a compressor motor rated for 208/230 volts single-phase, the minimum and maximum operating voltages, respectively, are:</h2></h3></section><section><h3><h2>During the heating season, increased air velocity at the supply register may cause an individual to feel:</h2></h3></section><section><h3><h2>Unless otherwise indicated by the manufacturer, during installation of an air conditioning condensing unit, the technician should be sure to:</h2></h3></section><section><h3><h2>An indication of non-condensable gas in a refrigeration system is significantly:</h2></h3></section><section><h3><h2>With the condensing pressure and compressor speed remaining constant, a decrease in suction pressure will cause a(n):</h2></h3></section><section><h3><h2>What are the two factors making up the safety classification for refrigerants?</h2></h3></section><section><h3><h2>Which of the following is true of systems with multiple evaporators at different temperatures?</h2></h3></section><section><h3><h2>If charging a system by subcooling, which of the following metering devices is installed?</h2></h3></section><section><h3><h2>Which of the following would be most affected by the use of an oversized suction line?</h2></h3></section><section><h3><h2>In a liquid line, excess pressure drop can cause:</h2></h3></section><section><h3><h2>Low ambient head pressure controls in a condensing unit function by controlling flooding of liquid refrigerant in the:</h2></h3></section><section><h3><h2>An external equalizer connection on a thermostatic expansion valve is used to:</h2></h3></section><section><h3><h2>An oil separator should be installed in a warm location so that refrigerant vapors in the separator will be less likely to:</h2></h3></section><section><h3><h2>In a pumpdown system, the solenoid valve should be installed in the:</h2></h3></section><section><h3><h2>A refrigeration system should be evacuated down to what level and why?</h2></h3></section><section><h3><h2>Frost is observed at the suction service valve of a low-temperature semi-hermetic compressor, it is a sign of:</h2></h3></section><section><h3><h2>To check the operating superheat of a thermostatic expansion valve, the technician needs suction pressure and:</h2></h3></section><section><h3><h2>To obtain a definite indication of whether or not an evaporator is fully utilized, the technician should check:</h2></h3></section><section><h3><h2>On a new installation, the purpose of adjusting a thermostatic expansion valve to maintain a low superheat is to ensure that:</h2></h3></section><section><h3><h2>Inadequate airflow across the evaporator of a walk-in cooler may damage the compressor due to:</h2></h3></section><section><h3><h2>When the temperature at the sensing bulb of a thermostatic expansion valve increases, the valve:</h2></h3></section><section><h3><h2>When a thermostatic expansion valve is used, as the load on the evaporator increases, the refrigerant flow:</h2></h3></section><section><h3><h2>The schedules set up in a maintenance program should provide that filter-driers be replaced:</h2></h3></section><section><h3><h2>If the liquid line has substantial flash gas in it, the thermostatic expansion valve will:</h2></h3></section><section><h3><h2>The condensing unit fans are cycling on and off on a pressure switch every 15 seconds. Which course of action should the technician take?</h2></h3></section><section><h3><h2>An evaporator pressure regulator valve installed in the suction line is used to control the:</h2></h3></section><section><h3><h2>When checking a starting relay with the ammeter jaws around one of the wires connected to the starting capacitor, a continuous current draw is indicated. This means that the:</h2></h3></section><section><h3><h2>What device should be used to measure the amount of refrigerant added into a system?</h2></h3></section><section><h3><h2>When installing manifold gauges on a unit, what is a critical step?</h2></h3></section><section><h3><h2>To determine that a liquid line filter-drier is restricted on an operating system, the technician should check:</h2></h3></section><section><h3><h2>What measurement can be used to determine if a TXV system is overcharged?</h2></h3></section><section><h3><h2>What is an indication of an overcharge in a fixed orifice system?</h2></h3></section><section><h3><h2>What is a lower flammability limit (LFL)?</h2></h3></section><section><h3><h2>What should be done after an ignition even to check for the presence of hydrofluoric acid in the workspace?</h2></h3></section><section><h3><h2>If hydrofluoric acid is detected after an ignition event, what should a technician do?</h2></h3></section><section><h3><h2>What is an upper flammability limit (UFL)?</h2></h3></section><section><h3><h2>An occupant can feel uncomfortable due to:</h2></h3></section><section><h3><h2>At what two points should a technician place the probes on a gas furnace to measure the total external static pressure of a system?</h2></h3></section><section><h3><h2>Excess cooling airflow on an HVAC system will cause:</h2></h3></section><section><h3><h2>What are the effects on an HVAC system, in the cooling mode, from a leaking return air duct in unconditioned spaces?</h2></h3></section><section><h3><h2>The following conditions exist: </h2><p> </p><h2>• Indoor dry bulb reading 76 degrees F</h2><h2>• Outdoor dry bulb reading 94 degrees F</h2><h2>• Indoor wet bulb reading 70 degrees F</h2><h2>• Outdoor wet bulb reading 78 degrees F </h2><h2> </h2><h2>What is the approximate conditioned space relative humidity ?</h2></h3></section><section><h3><h2>What effect does air movement inside a room have on the comfort of the occupants?</h2></h3></section><section><h3><h2>Which of the following occurs when an air mass is heated?</h2></h3></section><section><h3><h2>How does a thermistor temperature sensor function?</h2></h3></section><section><h3><h2>At what RH% will wet bulb and dry bulb temperatures be the same?</h2></h3></section><section><h3><h2>At sea level sensible BTU is found by multiplying the CFM by the temperature difference and then by:</h2></h3></section><section><h3><h2>On a small packaged AC unit using a direct drive blower, what measurements must be made in order to determine total cooling system capacity and the percentage of sensible cooling vs. latent cooling?</h2></h3></section><section><h3><h2>Which of the following can interfere with an outdoor ambient dry bulb measurement?</h2></h3></section><section><h3><h2>A complaint of uncomfortable conditions from a homeowner leads to a service call. Which measurements are needed to investigate the homeowner complaint?</h2></h3></section><section><h3><h2>What is the total external pressure when a technician's test probe after the filter reads -.25 and the technician's test probe before the indoor coil reads .50?</h2></h3></section><section><h3><h2>Which of the following can be used to calculate the direct measurement of airflow from a register or grille?</h2></h3></section><section><h3><h2>External static pressure of a gas furnace is measured across:</h2></h3></section><section><h3><h2>What determines the external static pressure on a residential furnace?</h2></h3></section><section><h3><h2>Using a hot wire anemometer, a technician performs a velocity traverse of a 12" x 16" rectangular duct. The technician makes 6 measurements of: 620 FPM, 660 FPM, 600 FPM, 640 FPM, 630 FPM and 650 FPM. What is the airflow volume through the duct?</h2></h3></section><section><h3><h2>Which of the following is a mass flow measurement?</h2></h3></section><section><h3><h2>Flexible duct work should be supported:</h2></h3></section><section><h3><h2>Air balancing dampers:</h2></h3></section><section><h3><h2>A 5-ton, belt drive air handler is only moving 1600 CFM airflow and it needs to be increased to 2000 CFM. How would a technician increase the airflow?</h2></h3></section><section><h3><h2>In an alternating current circuit, the effective resistance derived from the ohmic resistance and reactance is called:</h2></h3></section><section><h3><h2>Which of the following is electricity?</h2></h3></section><section><h3><h2>How much AC voltage tolerance can be used + or - on a manufactured mechanical piece of equipment?</h2></h3></section><section><h3><h2>Which component is an example of a purely resistive load?</h2></h3></section><section><h3><h2>Which of the following is the BEST conductor of electricity? </h2></h3></section><section><h3><h2>A heat pump has just changed over into the defrost cycle. The outdoor fan has just stopped. What is the most likely reason? </h2></h3></section><section><h3><h2>Which of the following functions would help dehumidify in a single-stage residential application? </h2></h3></section><section><h3><h2>A wiring diagram that shows the sequence of operations in a vertical format is called a:</h2></h3></section><section><h3><h2>When using a digital ohmmeter to measure the resistance of an outdoor air temperature sensor, what do the letters "OL" on the display indicate?</h2></h3></section><section><h3><h2>How is a run capacitor wired with a PSC motor?</h2></h3></section><section><h3><h2>Which of the following is true concerning an electronically commutated motor?</h2></h3></section><section><h3><h2>A technician finds a 240 volt240-volt line voltage-24volt control system with an electronic thermostat is not working and has the following conditions: </h2><p> </p><h2>• Line voltage measures 242 volt</h2><h2>• Control voltage source measures 24 volts</h2><h2>• Thermostat signal to the unit is 24 volts</h2><h2>• Zero volts across a normally open time delay control switch</h2><h2>• Zero volts across a normally closed overload control switch</h2><h2>• 24 volts applied to the system contactor</h2><h2>• The system contactor is not engaged </h2><h2> </h2><h2>Which of the following is indicated?</h2></h3></section><section><h3><h2>A technician finds the following conditions on a residential gas furnace no heat call: </h2><h2> </h2><h2>• Furnace has a 120-volt rating </h2><h2>• Single pole circuit breaker indicates 120 volts to furnace</h2><h2>• Service switch for furnace indicates 120 volts to furnace</h2><h2>• Door switch shows 120 volts across the switch</h2><h2>• Control transformer shows zero voltage output</h2><h2>• No voltage is present at the thermostat</h2><h2>• The furnace control board is not responding </h2><h2> </h2><h2> Which of the following is indicated?</h2></h3></section><section><h3><h2>What would an HVAC technician expect to encounter in a case where a potential relay has fused contacts and does not open to remove the start capacitor from the circuit?</h2></h3></section><section><h3><h2>What is the result of a PSC outdoor AC condenser fan motor spinning backwards?</h2></h3></section><section><h3><h2>What does a room thermostat measure?</h2></h3></section><section><h3><h2>What does an evaporator defrost control detect in order to open?</h2></h3></section><section><h3><h2>When considering the sequence of operation of a gas furnace, the master control board must prove that the pressure switch is:</h2></h3></section><section><h3><h2>When checking line voltage at a single-phase contactor with the contactor in the open state, at which terminals should a technician read line voltage? </h2></h3></section><section><h3><h2>What is used to measure flame rectification current? </h2></h3></section><section><h3><h2>On a cooling only system, a device that cycles the outdoor fan based on temperature is:</h2></h3></section><section><h3><h2>The defrost board on a heat pump has a W2 or W terminal for what purpose? </h2></h3></section><section><h3><h2>When swaging soft copper tubing with a mechanical expander, what should an HVAC technician do to prevent splitting the copper?</h2></h3></section><section><h3><h2>What is the softening of hard copper by heat treatment called?</h2></h3></section><section><h3><h2>What is the minimum number of low voltage control wires which need to be run to a two-stage AC condensing unit, which has no circuit board in it?</h2></h3></section><section><h3><h2>When installing a new package unit on a roof what may be required to ensure the roof can support the additional weight of system?</h2></h3></section><section><h3><h2>Which of the following is a variable that can impact residential air handler circuit breaker and wiring sizing?</h2></h3></section><section><h3><h2>On an electronic thermostat with a default cycle rate for the cooling mode of 3 cycles per hour, what would be the result of increasing to 6 cycles per hour?</h2></h3></section><section><h3><h2>When attaching a round metal duct to a sheet metal plenum, which procedure should the technician use after cutting a hole in the plenum?</h2></h3></section><section><h3><h2>Which of the following tools are used to bend a flange in a supply plenum to attach it to a cased coil in field install applications?</h2></h3></section><section><h3><h2>What tool should be used when fabricating a piece of sheet metal with a 45-degree bend?</h2></h3></section><section><h3><h2>When starting a new TEV metering device system with high indoor DB temperature (over 85°F), what system conditions would be expected when compared to normal operating conditions?</h2></h3></section><section><h3><h2>Once a system is started, if the return air duct is making a loud whistling noise, what could be the cause? </h2></h3></section><section><h3><h2>Prior to energizing a package unit, the technician should verify the:</h2></h3></section><section><h3><h2>As an air filter becomes dirty, the static pressure on the incoming side of the filter:</h2></h3></section><section><h3><h2>A working system is found to have an oil stain on a flare fitting at the condenser. What would be an appropriate next action? </h2></h3></section><section><h3><h2>When a higher than target ΔT of indoor air is observed, what should be checked first?</h2></h3></section><section><h3><h2>A technician encounters a 14 SEER R410a split AC system with the following running conditions: </h2><h2> </h2><h2>• 95°DB Outdoor</h2><h2>• 75°DB Indoor </h2><h2>• TEXV Metering Device</h2><h2>• 30° Measured Saturated Suction Temperature with no visible ice present yet</h2><h2>• 110° Measured Saturated Condensing Temperature</h2><h2>• 10° Evaporator Superheat</h2><h2>• 86° Subcool measured at the condensing unit </h2><h2> </h2><h2>What diagnostic area should the technician focus on? </h2></h3></section><section><h3><h2>A technician encounters a 14 SEER R410a split AC system with the following running conditions: </h2><h2> </h2><h2>• 95°DB Outdoor</h2><h2>• 75°DB Indoor </h2><h2>• TEXV Metering Device</h2><h2>• 25° Measured Saturated Suction Temperature with no visible ice present yet</h2><h2>• 105° Measured Saturated Condensing Temperature</h2><h2>• 25° Evaporator Superheat</h2><h2>• 0° Subcool measured at the condensing unit </h2><h2> </h2><h2>Which diagnostic area should the technician focus on? </h2></h3></section><section><h3><h2>What is the approximate superheat from the following R-410A data? </h2><h2>• Return air temperature 79 degrees F</h2><h2>• Suction pressure 114 psi</h2><h2>• Measured suction line temperature 48 degrees F</h2><h2>• Outdoor air temperature 92 degrees F </h2><h2>• Discharge pressure 376 psi</h2><h2>• Liquid temperature 106 degrees F</h2></h3></section><section><h3><h2>What is the 8-hour average maximum allowable living area PPM of CO according to EPA?</h2></h3></section><section><h3><h2>With complete combustion of natural gas, the amount of excess air can be estimated by:</h2></h3></section><section><h3><h2>A technician finds the following on a cooling service call: </h2><h2> </h2><h2>• Refrigerant is R- 410A• Outdoor temperature measures 87 degrees F</h2><h2>• Discharge Supply air temperature measures 74 degrees F </h2><h2>• Suction pressure measures 80.1 psi</h2><h2>• Suction temperature measures 68 degrees F</h2><h2>• Discharge pressure measures 365 psi</h2><h2>• Liquid line temperature measures 88 degrees F</h2><h2>• Airflow measures within manufacturer's range </h2><h2> </h2><h2>Which of the following is an indicated diagnosis?</h2></h3></section><section><h2></h2></section><section><h3></h3></section>