Rhode Island Journeyman's Refrigeration License Practice Test

These questions are part of the practice quiz. Start practicing

• When placed in a bucket of water, the refrigeration effect of 32 deg F ice will always provide how many BTUs per pound?
• What is the function of the evaporator in an air conditioning system?
• What does the critical pressure of a substance indicate?
• What role does the condenser play in the air conditioning cycle?
• Which statement accurately describes the relationship between temperature and pressure in refrigeration?
• What does PAG stand for in refrigerant terminology?
• Why are inspection openings required in concealed refrigerant piping?
• Which type of oil has the highest ability to absorb moisture?
• What is the purpose of the metal plates installed around an uncased evaporator coil?
• Which material must not be used in refrigeration systems containing halogenated refrigerants?
• How is one degree day computed?
• For systems containing more than how many pounds of any kind of refrigerant is a dated and signed declaration of the pressure test required?
• The purpose of purging air conditioning systems while brazing is to ____________________.
• After Nov. 11, 1993, what is the requirement for recovering more than 200 lbs of R-22?
• If a refrigeration system operates under critical pressure, what should be noted regarding pressure testing?
• When used for cooling only, what should the thermostat for the air conditioner be capable of being set to?
• What is the maximum tubing size for which a Group 1 refrigerant can be used for testing?
• Which component connects the compressor and condenser in a split system air conditioning unit?
• What type of compressor is typically best for variable load conditions?
• What is one reason for using an oil separator in the refrigeration process?
• What is the formula to calculate SEER?
• What does a potential relay do?
• ___________________ is the operating pressure of an oxygen regulator.
• What are desirable characteristics of oil in an air conditioning system?
• When adding central air to an existing furnace with an electronic air cleaner, which device should be used at the fan centers?
• What stores refrigerant until it is needed in the evaporator?
• What is connected to the metering device in a split air conditioning system?
• A "P" trap is installed when an evaporator coil is located on which side of the blower?
• What happens to a recovery cylinder that is filled beyond its capacity?
• What component of the air conditioning system converts low-pressure gas into high-pressure gas?
• What minimum perimeter is required for a secondary drain pan that serves a unit?
• What is the moisture content threshold that can initiate corrosion in an air conditioning system?
• What is the minimum size required for trap doors providing access to rooftop equipment?
• Which type of equipment uses refrigerant that boils above 50 F at atmospheric pressure?
• Which contacts on a normal fan center could be jumped to activate the furnace blower?
• What must never be done to a copper joint when the system is under pressure?
• What happens to the refrigerant in the compressor of an air conditioning system?
• Residential split system outdoor condensing units are typically wired with which type of power supply?
• Why is it recommended to add gravel fill under the pad of a condensing unit?
• The definition of latent heat is ______.
• A miscible fluid is characterized by what property?
• What type of refrigerant pipe joint construction is required for ducts carrying air to occupied spaces?
• What is essential for ensuring the electric motor operates safely?
• Who is allowed to indicate their qualifications for installing refrigeration systems?
• According to the second law of thermodynamics, how does heat travel?
• At what RPM does a generator produce 60 hertz of alternating current?
• Which substance is prohibited for pressure testing in refrigeration systems?
• When installing ductwork in a crawlspace, what must be done to prevent heat loss?
• What is the purpose of pressure relief in a refrigeration system?
• What component is necessary to protect the compressor from liquid refrigerant?
• For pressure testing, what safety measure is necessary when using Group 1 refrigerants?
• Where does the gas defrost system line connect?
• What is it called when a substance changes from a liquid to a gas?
• How are compressors commonly cooled in residential air conditioning systems?
• __________________ is the operating pressure of an acetylene regulator.
• Recovery cylinders must be approved by which authority?
• As the pressure increases in a sealed system, what happens to the temperature?
• When should a check valve be installed in the discharge line of an ammonia system?
• How can three-phase motors be operated?
• Which unit would be most desirable given the ratings of SEER and decibels?
• What is required for a joint while soldering to maintain cleanliness?
• Capacitors are primarily used with which type of motors?
• What is the primary purpose of providing a working platform for rooftop appliances?
• In which scenario is a water shutoff valve permitted on the condenser outlet?
• How much should a recovery cylinder be filled at maximum?
• What term describes the device that meters the flow of refrigerant into the evaporator?
• Why is it important to replace the oil in a vacuum pump?
• What is the highest temperature at which vapor can be liquefied regardless of the applied pressure called?
• Which types of refrigerants commonly use alkyl-benzene lubricants?
• Which device is commonly used with a two-speed compressor?
• The design pressure for a refrigeration system should be high enough to avoid what?
• What is the required strength for pressure vessels with a maximum design pressure of 15 psig?
• To ensure proper oil return to the compressor, how should the suction line be pitched?
• What role does an accumulator serve in a refrigeration system?
• How do capacitors affect the operation of an electrical motor?
• The purpose for a reaming tool is to __________________________.
• In a properly functioning air conditioning system, how should the refrigerant behave as it passes through the compressor?
• What must a system's design pressure not be less than for proper function?
• What is the ultimate bursting pressure of the receiver related to?
• When using portable ladders for roof access, what is a requirement for the ladder?
• What effect does adding salt have on the freezing point of water?
• What is the function of a DPDT switch in an HVAC system?
• What does high viscosity oil indicate about its consistency?
• A PSC is installed to do what?
• The definition of sensible heat is ______.
• What determines the correct length of refrigerant line to charge?
• What are the two types of compressor lubrication systems?
• Which fitting uses an o-ring to help seal its joint?
• What is the purpose of trap doors in refrigeration systems?
• Where must a secondary drain line be located for it to serve as an alarm?
• What does the "G" terminal on the thermostat control?
• What is the unit of electrical resistance?
• What is equivalent to 1 horsepower?
• What is the maximum bend that a lever bender can create?
• What is a potential consequence of liquid refrigerant entering the compressor oil?
• How does the evaporator coil usually operate when using a manual shutdown defrost system?
• Which tool is specifically used to expand the diameter of soft copper tubing?
• Which is a common feature of scroll compressors?
• What is the charge of an electron?
• Which type of compressor is not internally driven by a motor?
• At what temperature does StayBrite #8 solder melt?
• What is the minimum depth of a working platform required for each rooftop appliance when the slope of the roof pitch is three inches?
• What is the required nominal wall thickness for copper tubing not larger than 1/4" od?
• How is the compressor ratio determined?
• Which method is recommended for protecting an HVAC system from electrical faults?
• Which refrigerant is specifically mentioned in the recovery procedures for larger quantities?
• In a sealed refrigeration system, what happens to the pressure as the temperature increases?
• Why is compliance with minimum design pressure regulations important?
• What should a normally closed float switch connected to an auxiliary drain pan control?
• One millionth of a farad is referred to as?
• What device converts AC to DC?
• What type of systems commonly use PAG lubricants?
• The "Y" terminal on the thermostat is used for which component?
• If ductwork is located in an attic or crawlspace, what must it be?
• Which instrument is commonly used to measure a deep vacuum?
• _______________________ should be used to purge air conditioning systems tubing while brazing.
• Why is it necessary to increase dehydration time when using synthetic oil?
• How high must an indoor evaporator coil be installed above the heat exchanger?
• What is the maximum allowable pressure for recovering less than 200 lbs of refrigerant after Nov. 15, 1993?
• What must be provided for safe access to refrigeration equipment in hard-to-reach locations?
• What type of current do single-phase motors typically utilize?
• Where should refrigeration equipment installed on the roof be located in relation to any bearing wall?
• Which tool is used to hold copper tubing in place when making a mechanical joint?
• What is the minimum bending radius for 1/2" soft copper tubing?
• What type of license is necessary for advertising the ability to install refrigeration systems?
• What level of vacuum is considered proper when using a micron gauge on a system?
• In what manner does cold air behave in relation to warm air?
• How should the horsepower of electric motors without specified ratings on the nameplate be determined?
• What happens to the performance of the refrigeration system if the pressure drops significantly?
• Which lubricant is most commonly used with R-134a refrigerant?
• What is referred to as the ambient temperature?
• On a normal fan center, which contacts can be jumped to activate the condensing unit?
• Three states of matter are _________.
• What type of defrost system commonly uses a plate type evaporator coil?
• During the defrost cycle of a refrigeration system, what is primarily being removed?
• What characterizes a hermetic compressor?
• In which situation would you suspect moisture in an evacuated system?
• A parapet wall can be utilized in place of guard rails when the space between the exposed side of the appliance is what distance from the parapet?
• What is true about the design pressure of a receiver in a limited charge system?
• The gauges that are located on the oxyacetylene torch measure _____________________________________.
• Which fitting is commonly used in refrigeration to ensure a secure connection?
• A secondary circuit used to control a device that allows current to flow in the main circuit is known as what?
• What does performing a triple evacuation help achieve?
• Where should a room thermostat be mounted whenever possible?
• What do refrigerants containing Chlorine or Fluorine do when exposed to flame?
• What is critical for the proper installation of a refrigerant line?
• What is the main purpose of evacuating an air conditioning system?
• What is required for self-contained window air conditioners installed over public thoroughfares?
• Which refrigerant is not miscible with mineral oil?
• Why are proper hinging and counterbalancing important for trap doors?
• Who can sell or purchase liquids or gases intended for refrigeration use?
• What does the Ohmmeter require for its operation?
• What does an anemometer measure?
• What is the function of a Schrader valve in an evacuation process?
• What are the three classifications of recovery equipment?
• What is the function of the "R" terminal on the thermostat?
• _______________ could cause an explosion if it is used to purge an air conditioning system while brazing.
• What is the purpose of installing check valves in ammonia systems specifically concerning pressure?
• Pressure vessels with a maximum design pressure of 15 psig must be tested to withstand how many times the design pressure?
• What term describes a condition where hot air remains at the top of a room while cold air is at the bottom?
• What are the contacts that can be jumped to turn on the gas burner?
• Which are the three types of recovery methods currently in use?
• What are the common melting points of brazing material and silver solder?
• What does the refrigerant recovery unit primarily do?
• What is required when a condensing unit is pre-charged for 25' of refrigerant line but 32' is used?
• The definition of specific heat is _______________________.
• What is the primary purpose of a "P" trap in HVAC systems?
• Where can the evaporator used for central air conditioning be located?
• What is the secondary voltage on a step down control transformer for a residential furnace?
• What happens to the refrigerant in a compressor?
• What should be done when refrigerant pipe is concealed?
• What is the term used for a substance changing from a solid to a gas?
• How many BTUs are equivalent to 1 watt?
• What occurs when soldering a copper connection and solder is drawn into the joint?
• The definition of a BTU is ________.
• What does the term recovery refer to in refrigeration?
• What does a triple evacuation require?
• Which method is typically the fastest for defrosting an evaporator coil?
• Before soldering an evaporator coil, why must the end of the evaporator lines be opened to the atmosphere?
• How is absolute pressure calculated?
• What is the largest diameter of electrical wire size 6A and size 6B?
• What is the purpose of a blower relay coil in refrigeration systems?
• When installing a refrigeration line set through a masonry wall, what precaution should be taken?
• What is a requirement for systems design pressure in a refrigeration system?
• What rules apply to self-contained air conditioning units regarding public spaces?
• What is required for vapor to transition to a liquid state?
• What is the minimum evacuation level for an air conditioning system?
• Heat energy is measured in _________.
• Why is it important to insulate a suction line?
• What does Ohm measure?
• What are the three types of recovery machines being used today?
• The term capillary action means to _____________________.
• What component is commonly added to a hot gas defrost system that is not used in a warm water defrost system?
• What component is commonly found in a recycling machine but not in a recovery machine?
• What is the flash point of oil?
• What is the primary advantage of using recovery machines?
• Refrigerant pipe joints located in air ducts carrying air to occupied spaces must withstand what temperature without leakage?
• Before energizing a newly installed system, what should you always check for?
• What happens to the boiling point of water when salt is added?
• In terms of functionality, which type of compressor tends to have a more continuous operation?
• Which type of metering device is commonly used in a 12 SEER split air conditioning system?
• What ensures proper oil return when installing a refrigeration line set?
• In a refrigeration system, heat is absorbed by which process?
• The temperature scale that freezes water at 32 degrees and boils water at 212 degrees is known as the ___________ scale.
• Which process will create a stronger joint when working with metals?
• What must be done when recovering less than 200 lbs of R-22 after Nov. 15, 1993?
• What is the purpose of the accumulator in an air conditioning system?
• What does the pour point of oil indicate?
• What is the key benefit of insulating a suction line in refrigeration systems?
• How should a spring type tubing bender be positioned on the tubing?
• What is the relationship of absolute pressure on the low side to absolute pressure on the high side called?
• What type of equipment uses refrigerant that boils below -58°F at atmospheric pressure?
• What is typically used to connect different refrigeration components securely?
• Where must permanent lighting be provided at the rooftop access door?
• What type of lubricant is most commonly used with CFC refrigerants?
• What are the two types of compressor drives?
• What is the function of a TXV in an air conditioning system?
• For proper operation, where should the outdoor condenser be located?
• Quick connect fittings are commonly used on which type of lines?
• For an aluminum service cable on a 3-ton air conditioner, how does its diameter compare to that of copper?
• Which type of compressor is considered a non-positive displacement compressor?
• Which of the following aspects is critical to check during an HVAC system installation?
• What is the purpose of a crankcase heater on a compressor?
• What happens to the oil in a vacuum pump over time?
• The temperature scale that freezes water at 0 degrees and boils water at 100 degrees is known as the __________ scale.
• Which two compounds are used to compose an alkylbenzene lubricant?
• ____________ is the type of heat that is absorbed or extracted from a substance when the substance changes state.
• Which type of compressor is known for its quiet operation?
• What term describes the total amount of heat present in a given substance?
• Which component of the air conditioning system changes high-pressure gas into high-pressure liquid?
• Which term refers to the temperature at which oil begins to produce a waxy substance?
• Which compressor type can handle some liquid refrigerant flood back?
• Which of the following is NOT a common supplementary heat method used for removing frost from an evaporator coil?
• Which phase change involves a substance changing from a gas to a liquid?
• What is a consideration when installing equipment on the roof?
• If a condensing unit is rated at 8 decibels, how would it be described?
• How much moisture can one cubic foot of air at 50 deg F absorb compared to air at 100 deg F?
• What is a common consequence of not evacuating an air conditioning system?
• What defines a limited charge system?
• What device is typically used for measuring resistance in electrical circuits?
• What occurs when frost is present in a refrigeration system?
• Which decibel range is considered not objectionable to the human ear?
• What is the effect of using larger diameter hoses during evacuation?
• What is the main function of a compressor in an HVAC system?
• What is known as the eutectic point?
• Which type of copper tubing has the thickest wall?
• What is the purpose of the "W" terminal on the thermostat?
• What is the wire diameter of a 60-foot service cable for a 1 1/2 ton unit?
• What type of compressor is often characterized by its simplicity and low cost?
• Why is it important for the refrigerant pressure test declaration to be dated and signed?
• What is an important step to take when making a flare to prevent copper from splitting?
• Which factor is crucial for ensuring safety in pressure vessels in refrigeration systems?
• Where is excess superheat in the system that must be removed before condensation occurs?
• What is a Baudelot cooler primarily described as?
• What are the two most common types of compressors used in residential air conditioning systems?
• Leaks in coils made from aluminum are commonly repaired with ___________.
• What should be done if refrigeration equipment is placed on roofs, attics, or crawl spaces?
• What does "design pressure" primarily refer to in refrigeration systems?
• Residential or light commercial air conditioning condensers are usually made from which materials?
• What is the minimum design pressure for a refrigeration system?
• What does the term 'recycle' mean in the context of refrigerant management?
• One ton of refrigeration is equal to __________.
• The amount of heat absorbed by the refrigerant in a refrigeration system is known as what?
• What is the minimum design pressure for a refrigeration system?
• What should be checked if a condensate line is not draining properly?
• What type of equipment uses refrigerant that boils between -58 and 50 F at atmospheric pressure?
• What is the melting temperature of 95-5 solders?
• What must be considered when setting a thermostat for cooling purposes in terms of its temperature range?
• During a system evacuation, which gauges should be opened?
• The properties of mineral oil are very common to the properties of which substance?
• What does "Volumetric Efficiency" indicate in refrigeration systems?
• What occurs during the process known as stratification in a room?
• Generally, which type of refrigeration system offers the greatest rate of heat transfer?
• What is a characteristic of splash lubrication in compressors?
• Which state of a substance has the highest heat content?
• When a substance changes from a gas to a liquid, this process is referred to as what?
• What is a decibel used for?
• When should the oil in a vacuum pump be replaced?
• When must an air conditioning system be evacuated?
• What is the typical measure used for working platforms on rooftops?
• What is typically the role of a pressure relief valve in refrigeration systems?
• Which device is responsible for converting DC to AC?
• In terms of HVAC systems, what does the abbreviation R typically refer to?
• What characteristic defines hydroscopic oil?
• What position should a three-way service valve be in during evacuation?
• What can be deduced if the pressure increases slightly and then stops after drawing the system down to 500 microns?
• When adjusting pressure on a regulator ____________________.
• What is the minimum distance required between an appliance and the edge of the roof unless approved with rigidly fixed rails?
• Is it permissible for someone to use another person's name to obtain a permit?
• What factors can decrease the evacuation time of an air conditioning system?