A/C Employment Ready Certification Practice Test

These questions are part of the practice quiz. Start practicing

• Which of the following statements about refrigerants is true?
• What does absolute pressure measure?
• What is one consequence of overcharging a refrigerant in an air conditioning system?
• In the context of refrigeration, what role does latent heat play?
• When topping off an operating system containing a blended refrigerant, what is the proper method?
• What is the temperature at which moisture starts to condense from the air known as?
• Which component is best suited for systems with fairly constant loads?
• An increase in head pressure causes what to occur in a capillary tube?
• What is the purpose of the condenser coil in an A/C system?
• If water is pooling around an A/C unit, what could this indicate?
• The automatic expansion valve is most effective in which type of system load condition?
• What procedure is essential before any maintenance on a refrigeration system?
• Which component primarily dissipates heat from the refrigerant in an air conditioning system?
• What layer of defense does a low-pressure cut off switch provide?
• Which of the following is a symptom of frost developing on a suction line?
• In which scenario is a solenoid valve most critical?
• If refrigerant R-134a vapor enters the condenser at 124 PSIG and 100°F, what pressure will it be approximately at upon leaving at 80°F?
• What device controls a thermal electric (solid-state) expansion valve?
• In the context of A/C systems, what does the term "superheat" refer to?
• Which of the following is a main component of a typical A/C system?
• What is a common indication that the condenser is functioning properly?
• How does an A/C system operate in cooling mode?
• Which symptoms suggest that a condenser is oil logged?
• What symptoms are caused by air or other noncondensible gases in a capillary tube air conditioning system?
• If a 30-pound cylinder of reclaimed R-410 refrigerant has been stored at 70°F overnight, what would you expect the pressure to be?
• What do we call heat that is added to a vapor after a change of state has occurred?
• What is the risk of not properly recovering refrigerant from a system?
• What is the primary purpose of an air conditioning system?
• At what temperature will water vaporize in a 28 in Hg vacuum?
• What does a temperature differential across a filter dryer indicate?
• Frost on the suction line indicates what regarding temperature?
• Low operating pressures and low system amperage in a split system may indicate what problem?
• What effect does a rise in evaporator pressure have on the automatic expansion valve?
• What is the function of an accumulator in a refrigeration system?
• What is a common effect of dirty air filters on A/C systems?
• In the context of A/C systems, what is the significance of measuring airflow?
• Which of the following is true regarding the relationship between refrigerant and efficiency in A/C systems?
• The movement of heat through a fluid or air is referred to as what?
• By what mechanism is the oil pressure safety switch activated?
• Which of the following is considered a refrigerant?
• A broken reed valve in a compressor typically results in what symptom?
• What is the term used for heat that causes a change in temperature of a substance?
• What is one potential consequence of neglecting to maintain a clean evaporator coil?
• When using an automatic expansion valve, what effect does a low refrigerant charge have?
• What can happen if there is a blockage in the A/C system?
• How does an air conditioner improve indoor air quality?
• Which component is responsible for changing the refrigerant's pressure?
• What is the state of the refrigerant as it enters the condenser?
• The refrigerant condensing temperature in a water-cooled condenser should be approximately _____ higher than the leaving water temperature?
• What is the recommended indoor relative humidity level for residential spaces during the summer?
• What is the first function a condenser must perform before condensing can occur?
• What can moisture in a refrigeration system cause?
• A refrigerant leak in an air conditioning system will typically result in which of the following?
• What could excessive superheat in a refrigeration system indicate?
• How should an A/C refrigerant leak be handled?
• What are the three basic types of condensers?
• What is one reason that A/C systems might freeze up?
• What is the minimum vertical drop required from the outlet of the condensate drain pan to the inlet of the P-trap?
• Which of the following methods cannot be implemented as a low ambient temperature control?
• What is the purpose of a mechanical shaft seal in a compressor?
• How can airflow issues in an A/C system be identified?
• What is the flow rate of a TEV used in R410A systems compared to R22 systems?
• What is the role of a defrost control in heat pumps?
• Where is a sight glass typically located in a refrigeration system?
• What is the purpose of a low pressure cut off switch in a refrigerant system?
• What is the typical outcome when a compressor is subject to liquid slugging?
• If a TEV sensing bulb becomes detached from the suction line, what will happen?
• When does a refrigerant give up heat?
• Prior to opening a vapor/compression system for service, what must be done with the refrigerant?
• What is a common indicator of low refrigerant in an A/C system?
• What is the result of back seating a two-way service valve?
• Which of the following best describes 'sensible heat'?
• What is one benefit of regular maintenance for an A/C system?
• What is the relationship between zero psig (pounds per square inch gauge) and atmospheric pressure?
• What is the recommended movement speed of the sensor probe when using an electronic leak detector?
• What is a common effect of overcharging an A/C unit with refrigerant?
• Why is regular maintenance critical for A/C systems?
• What can bubbles in the sight glass indicate about the TXV setting?
• What is the indication of high superheat in a refrigeration system?
• What is the main objective of an air conditioning unit during summer months?
• What effects can insufficient airflow through the evaporator coil have on an HVAC system?
• Which of the following best describes the importance of refrigerants in A/C systems?
• If the R134a high pressure gauge reads 143 psig and the liquid line temperature at the condensing unit is 95°F, what is the system operating sub cooling?
• What is a likely effect of a partially clogged capillary tube in an air conditioning system?
• What could be a cause of a partially iced over evaporator?
• How is the efficiency of an A/C system typically assessed?
• Which component of an A/C system is primarily responsible for circulating air?
• A liquid-to-suction heat exchanger is used primarily to achieve what?
• Which type of air-conditioning compressor is known for its energy efficiency?
• What can be affected by dirty condenser coils?
• What is the role of the evaporator coil in an A/C system?
• What is a significant consequence of an A/C unit that fails to start?
• What is the typical lifespan of a residential A/C system?
• What is an essential factor in ensuring optimal operation of an A/C system?
• What could be a result of evaporator coil icing in an air conditioning system?
• Which of the following can lead to poor indoor air quality in A/C systems?
• What does zero psia (pounds per square inch absolute) approximately equal at sea level?
• What is the maximum allowable difference between the refrigerant condensing temperature and the entering air temperature in an air cooled condenser?
• What is transferred from the refrigerated space to the refrigerant in the evaporator?
• What could cause a compressor to overheat?
• What is the correct sequence of steps in the vapor-compression refrigeration process?
• What is the most critical consideration when selecting an evaporator coil?
• Why is sealing ducts important in maintaining A/C efficiency?
• What happens in a capillary tube air conditioning system when there is a refrigerant overcharge?
• What effect does high discharge pressure have on an air conditioning system's performance?
• How are solid contaminants from a severe hermetic compressor motor burn out best removed?
• What issue can arise from an oversized air-conditioning system?
• What is the primary function of the evaporator in a refrigeration cycle?
• What may be indicated by low system amperage draw in an air conditioning system?
• What symptoms indicate a low refrigerant charge in an air conditioning system?
• What is the main purpose of the de-superheating process in a condenser?
• What component is essential for a system to switch between heating and cooling in heat pumps?
• A faulty condenser fan motor in an air-conditioning system will produce which symptoms?
• What does reduced airflow in a blower assembly potentially result in?
• What is the effect of increased clearance space in a reciprocating compressor?
• Which factor is crucial for maintaining optimal performance in an air conditioning system's evaporator?
• Which process describes the transition of refrigerant from a liquid to gas state while absorbing heat?
• What is a capacitor in the context of A/C systems?
• What is the primary purpose of a liquid receiver?
• Which of the following represents heat energy represented in mechanical work?
• What effect does a low refrigerant charge have on a refrigeration system’s performance?
• What primary function does a thermostat serve in an A/C system?
• An inefficient compressor is typically indicated by what kind of head and suction pressures?
• Why is balancing airflow important in an A/C system?
• What can be used for leak detection with high-pressure refrigerants?
• What happens to the thermostatic expansion valve when there is a decrease in superheat?
• A customer reports that their air conditioning system runs constantly but is not cooling adequately. When inspecting, you find the suction line is very cold and the compressor is sweating. What is a likely cause?
• What is a common cause of compressor failure in refrigeration systems?
• What common issue can arise during the installation of an A/C system?
• In an air-conditioning system that uses a thermostatic expansion valve, the temperature of the evaporator outlet is typically:
• During a residential service call, a technician finds the unit completely out of refrigerant. What should the technician use to pressurize the system?
• What is the role of a fan in an air conditioning system?
• What impact can poorly sealed ducts have on an A/C system?
• What does the term "latent heat" refer to?
• If the cut-off plate is removed from a blower assembly, how does it affect blower performance?
• Which method of heat transfer occurs through direct contact?
• How does the clearance space in a reciprocating compressor affect its performance?
• What is a major risk of overcharging an A/C system with refrigerant?
• What is one crucial aspect of maintaining A/C systems during the off-season?
• What does liquid slugging refer to in a compressor?
• What is the generally accepted range for evaporator airflow in CFM per ton of residential air conditioning?
• What typical symptom indicates an A/C unit may have a faulty capacitor?
• What is true about the solenoid valve in a pump down system?
• What is the expected temperature of water leaving a condenser if 10 pounds of refrigerant loses 20 BTUs per pound and the entering water temperature is 80°F?
• What does A/C stand for in the context of certification?
• In a water cooled condenser, the refrigerant condensing temperature should not be more than how many degrees higher than the leaving water temperature?
• What aspect of an A/C system can be affected by inadequate insulation of refrigerant lines?
• Which of the following are common signs of a refrigerant leak?
• Which factor does the SEER rating primarily reflect?
• A thermostatic expansion valve is designed to maintain which of the following?
• What process should be done to remove as much moisture as possible from a refrigeration system?
• What type of maintenance is crucial at the beginning of the cooling season?
• What safety precautions should be taken when servicing an A/C unit?
• The heat removed from the refrigerant by the condenser includes what types of heat?
• In an R410A system, if the compound gauge reads 124 psig and the suction line temperature is 54 degrees F, what is the operating system superheat?
• Which substance is commonly used as a refrigerant in residential A/C systems?
• What is a potential consequence of low refrigerant charge in a system using a TEV or a capillary tube as a metering device?
• What should the state of the refrigerant be in the suction line?
• Why must local codes be followed when installing an A/C system?
• What could cause an A/C system to freeze up?
• What does a compound pressure gauge measure?
• What type of heat transfer occurs in liquids and gases due to bulk movement?
• In a direct expansion (DX) evaporator system, what state does the refrigerant enter the evaporator as?
• After a compressor replacement, a residential split system is not cooling effectively. The evaporator appears starved for refrigerant, and the liquid line is sweating at the dryer. What is the likely cause?
• Which of the following is not a symptom of a hermetic system that is low on refrigerant?
• How many operating pressures does a thermostatic expansion valve have?
• What does the acronym "HSPF" signify in the context of air conditioning?
• What is a heat pump primarily used for?
• How are fan airflow pressures typically measured?
• When dealing with A/C installations, adhering to local codes is primarily about what?
• What is the function of the compressor in an A/C system?
• What is the primary function of a TEV in refrigeration systems?
• Why is it important to monitor the condition of the sight glass?
• What is the primary purpose of refrigerant recovery in A/C maintenance?
• What is a common cause of odors from an A/C system?
• Which method is commonly used to assess the efficiency of an A/C system?
• What is the process called when heat is transferred without any change in the temperature of a substance?
• What effect does ice formation on the evaporator coil indicate?
• What essential process occurs in the evaporator coil?
• What is the main function of the condenser in an air conditioning system?
• What impact does an undercharge of refrigerant typically have on the evaporator?
• When troubleshooting low pressures in an A/C system, which factor should be prioritized first?
• What is the consequence of neglecting regular A/C maintenance?
• What effect does the compressor have on the refrigerant?
• Which of the following is NOT a method of heat transfer?
• What is the purpose of an evaporator pressure regulating valve (EPR)?
• What is the primary function of an evaporator fan in an A/C system?
• How often should A/C filters typically be changed for optimal performance?
• When should a system be flushed?
• Which of the following symptoms may indicate a problem with the compressor in an HVAC system?
• Which method can significantly improve an A/C system's energy efficiency?
• What is the result when the temperature difference between the evaporator inlet and outlet is significant?
• What does SEER stand for in the context of A/C systems?
• When should an A/C professional be called?
• How does high humidity affect the efficiency of an A/C system?
• Which of the following should be checked if an A/C unit is blowing warm air?
• What is a potential outcome of using a "bad" capacitor in an A/C unit?
• When is it particularly important to check the P-trap in a condensate drain system?
• What is the maximum operating pressure setting for an acetylene torch?
• Which of the following statements about a capillary tube metering device is NOT true?
• What must be done periodically to maintain an A/C system's effectiveness?
• How does the expansion valve contribute to an A/C system?
• The thermostatic expansion valve operates based on which of the following pressures?
• Which component of an A/C system is primarily responsible for refrigerant circulation?
• What role does the Heating Seasonal Performance Factor (HSPF) play in A/C systems?
• What does SEER stand for in the context of air conditioning systems?
• What defines a ductless A/C system?
• What is an indicator that an A/C system may require service?
• When connecting copper to steel, which brazing filler alloy is recommended?
• What is the standard unit for measuring the quantity of heat in a substance?
• What is the most probable cause of noise in a compressor after an air-conditioning system is repaired and recharged?
• What type of electrical current do most A/C systems operate on?
• Which type of heat causes a change in state of a material without a change in temperature?
• What is the primary role of an A/C system's drain line?
• What is the purpose of having refrigerant slightly superheated in the suction line?
• What can result from not changing A/C filters regularly?
• Where should a liquid line filter dryer be installed?
• Why is it important to insulate refrigerant lines in an A/C system?
• What is the function of air filters in an A/C system?
• What symptoms are likely to result from a dirty evaporator in an air conditioning system?
• Which tool is used to measure refrigerant levels in an A/C system?
• What can be done to prevent compressor overheating?
• The temperature rise method of determining air volume can be effectively applied to which type of heating system?
• Which of the following is NOT classified as a thermodynamic property of refrigerants?
• When installing a thermostat static expansion valve sensor bulb, which statement is NOT true?
• Which type of gauge is used to measure microns in a vacuum?
• What is the role of a metering device in an A/C system?
• What is the role of the accumulator in a refrigeration system?
• What does the automatic expansion valve aim to maintain in an air conditioning system?