RSI Phase 8 Practice Test

These questions are part of the practice quiz. Start practicing

• Why are acetylene cylinders only used in the upright position?
• How is defrost normally accomplished in a medium temperature case?
• What should be checked as part of the start and check phase?
• What is the role of a thermal expansion valve (TEV) in a refrigeration system?
• Where is refrigerant piping typically run from a rack system to the refrigerated cases?
• What is one advantage of using a gas metal arc welding (MIG) process?
• In which type of refrigeration system is the cooling effect achieved through the absorption process?
• What effect does increased humidity in a store have on the operation of refrigerated cases?
• Why might a 35°F medium temperature case require defrosting?
• When installing equipment with serviceable components, what must be ensured?
• What is the maximum safe level to pressurize a system with nitrogen when checking for leaks?
• What is the consequence of not defrosting a 35°F medium temperature case?
• What effect does a leaking valve have on a reciprocating compressor's operation?
• What should a technician confirm about the disconnect before performing maintenance on an air conditioning unit?
• What is the purpose of annealing copper tubing?
• Why is carbon dioxide gas added to a draft beer system?
• What component enables a single compressor to control multiple cases at varying temperatures?
• What is the average serving temperature range for soft-serve ice cream?
• Which installation phase is conducted first in the installation process?
• Which installation phase is performed last in the installation process?
• What happens to the evaporator pressure if it drops below the set point?
• Which of the following is a common method for controlling evaporator temperatures?
• What type of energy is utilized to circulate the refrigerant in an absorption refrigeration cycle?
• What is the approximate ventilation requirement for low temperature, air-cooled condensing units located indoors?
• What organization rates the large pressurized cylinders in air conditioning systems that hold more than 15 psig internal pressure?
• The National Electric Code (NEC) is enforced in?
• What happens to the temperature of products in open display cases when the air curtain is disrupted?
• What tool do technicians use to check for electrical potential at a switch or load?
• For optimal efficiency, what air flow direction should filters be installed according to?
• What role does the compressor play in a refrigeration cycle?
• Temperature controls used on most commercial reach-in coolers primarily sense the temperatures of?
• In the context of air conditioning systems, what is meant by 'high side pressure'?
• How frequently should the water handling components of an ice machine be cleaned?
• What are the two main categories into which electrical components can be classified?
• What does an "OL" reading on a technician's meter indicate when checking the compressor start winding?
• Why is it recommended that an acetylene cylinder valve never be opened more than 1/2 turn?
• What is the term for the part of a planned maintenance call that involves replacing worn parts and making necessary adjustments?
• What type of compressors are used in protocol refrigeration systems?
• What is a system with multiple compressors piped in parallel to feed multiple cases known as?
• What happens to evaporated condensate in reach-in coolers or freezers located away from drains?
• Why is allowing clearance important when installing serviceable equipment?
• Which device is used to maintain high side pressure in a water-cooled condenser?
• Moisture indicators are typically part of which component in a refrigeration system?
• What should be ensured after discharging a capacitor?
• What is a requirement for all draft beer dispensers aside from temperature maintenance?
• A compressor's net oil pressure is calculated by?
• What is the primary function of an evaporator pressure regulator?
• What can cause the supply voltage to drop below the minimum voltage when the unit is operated?
• Which type of ice does an ice machine produce when ice forms on a vertical evaporator plate with flowing water?
• What action indicates that a compressor winding is faulty?
• What indicates the correct way to install a disposable panel air filter?
• The coil of a potential relay used with small single-phase compressors should have a resistance of approximately?
• A reciprocating compressor with leaking valves will typically show which of the following characteristics?
• What is the function of the door switch on a walk-in freezer?
• How is defrost normally accomplished in a low temperature case?
• What are the three major electrical defects in compressor motors detectable with an ohm meter?
• Which material is used for air conditioning drain lines?
• What is a primary reason to use a flow control device in refrigeration systems?
• Which type of refrigeration applications typically utilize crankcase pressure regulators?
• What is the approximate resistance of the coil in a current relay used with small single-phase compressors?
• What safety equipment is essential during the servicing of combustion appliances?
• What are the two basic types of relieve valves used in refrigeration systems?
• What is the proper technique when brazing on refrigeration lines with an attached service valve?
• Where is an oil separator usually installed in a refrigeration system?
• Which of the following is a key factor for ensuring energy efficiency in refrigerated open display cases?
• In most commercial refrigeration systems, where is the excess refrigerant stored when not in use?
• What component is designed to prevent liquid refrigerant from returning to the compressor?
• What direction should the arrow stamped on the body of a solenoid valve point during installation?
• What instrument is used to check the amount of electrical current a load is drawing?
• What component is used between stages of a compound compression system?
• To ensure that refrigeration oil being added is clean and dry, how should the oil be purchased?
• What is the first step in selecting commercial refrigeration equipment for a new installation?
• What should be used to size the power wire for air conditioning equipment?
• What is the effect of installing a vertical discharge air cooled condenser under an overhang?
• What type of device controls the flow of refrigerant in a refrigeration system based on an electric signal?
• Why is a check valve necessary in the suction line of the lowest temperature coil in a multiple evaporator system?
• In refrigeration, why is preventing refrigerant migration important?
• In the context of refrigerated display cases, what does 'air curtain' refer to?
• Which of the following is an important factor affecting the efficiency of a refrigeration system?
• How does the compressor on a refrigerated air drier operate?
• A suction-to-liquid line heat exchanger is used to increase what two parameters?
• What is the most important consideration when installing a unit with an air cooled condenser?
• When parallel compressors are used, what must be ensured for proper operation?
• Which component is responsible for converting the refrigerant from gas to liquid in a refrigeration cycle?
• A common use for absorption refrigeration is in?
• What is the primary purpose of a check valve in refrigeration systems?
• To maintain the efficiency of a draft beer system, what needs regular attention?
• What is a compact system located close to refrigerated cases called, which uses a plate fluid condenser?
• What is the purpose of purging the lines with nitrogen during brazing?
• What advantage do glass door frozen food cases have over open display frozen food cases?
• Which system allows for the use of multiple refrigerants?
• Which method is NOT a recommended sealing technique for metal ductwork?
• What type of system maintains temperatures of -250°F and below?
• How can a low pressure switch function as an operating control for a refrigeration case?
• What is the lowest evaporator coil temperature that traditional mechanical compression systems can achieve?
• When a technician needs to check the heating operation of a heat pump without gauge access ports, what should they do first?
• When charging a system with zeotropic refrigerants like R410a, how should the refrigerant leave the refrigerant cylinder?
• What happens first when a cascade system starts?
• What does the term "brazing" refer to in metalworking?
• What is the approximate difference in size between the outside diameter of schedule 40 black iron pipe and its nominal size?
• What is typically found in a multi-deck open display freezer?
• What should be done first when troubleshooting a non-operational air conditioning system?
• How are water pumps in hydronic heating systems typically verified?
• How can hard copper tubing be joined?
• What should be done with the nitrogen holding charge in the evaporator coil and refrigerant lines when installing split systems?
• Define predictive maintenance.
• What does a higher than expected pressure reading indicate when checking a refrigeration system?
• To safely increase the pressure in a refrigerant cylinder while charging the system, what should a technician do?
• What material should clothes worn during welding be made of?
• What distinguishes a flare for an R-410a system from that for an R-22 system?
• What material is commonly used for refrigerant piping in air conditioning systems?
• Which type of compressor is typically NOT used in liquid chillers?
• How is commercial refrigeration equipment categorized based on evaporator coil temperature?
• What is a key difference between schedule 40 and schedule 80 iron pipe?
• How can regular maintenance impact the longevity of equipment?
• How is an electric motor's performance affected by increased load?
• What is the purpose of using a solenoid valve in a refrigeration system?
• What is a common cause for low system subcooling?
• A hot compressor with an infinite ohm reading between Common and the other two terminals and a reading of 43 ohms between the start and run terminals most likely has?
• What is the normal storage temperature range for items like milk and cheese?
• What is the importance of checking supply voltage before system operation?
• What is a common welding process for joining sheet metal?
• How does refrigeration capacity correlate with food hydration cycles in medium temperature multi-deck open display cases?
• Which type of system is typically associated with the use of evaporator pressure regulators (EPR)?
• What could potentially happen if the pressure in a draft beer system is too low?
• What powers the refrigeration system in trailer-mounted systems?
• What is the primary temperature control factor for open display cases?
• How is planned maintenance defined in equipment management?
• Which type of ice is produced in a machine where ice forms on the inside of a cylinder and is scraped off by an auger?
• What are the essential elements of a refrigeration system in order from the low side?
• What is a common disadvantage of using oxyacetylene torches?
• What temperature conditions are met by a system that utilizes cryogenic refrigeration?
• Which device is likely installed in the discharge line to prevent liquid refrigerant from flowing back to the compressor?
• What are the three groups that refrigerated food-storage products are categorized by?
• What should be confirmed before conducting any pressure test?
• Why are the stubs on a compressor and filter driers more difficult to braze than copper pipe?
• What is the purpose of a crankcase pressure regulator in a refrigeration system?
• What are the two most common sizes of oxygen cylinders used in the HVAC/R trades?
• How is the voltage drop in the power wire assessed?
• What is the primary function of a metering device in a refrigeration system?
• How should the fuse protection for air conditioning equipment be sized?
• Why are pipe threads tapered?
• If the run winding on a compressor shows a resistance of 0 ohms, what does this signify?
• What is the purpose of flux in welding?
• What should be done before opening an oil fill crankcase plug on a semi-hermetic compressor?
• What is the recommended method for ensuring a good metal bond during soldering?
• What is a health switch used for on vending machines?
• What is meant by expendable refrigerant?
• What does the nominal size of a pipe or tubing refer to?
• What does a voltage drop across a switch indicate?
• Why should caution be taken when swapping a low efficiency air filter for a higher efficiency model?
• What is the normal fluid temperature drop through a chiller?
• What are the types of copper tubing ordered by wall thickness from light to heavy?
• What is the definition of galvanized iron pipe?
• How does the operating cost of a rack system compare to that of separate condensing units for each refrigerated case?
• What is the primary advantage of using multiple compressors in a supermarket rack system?
• What is the primary difference between a batch freezer and a soft-serve freezer?
• To increase the operating superheat on a thermostatic expansion valve, what action should be taken?
• What does a cascade system achieve by using the evaporator of one refrigeration system?
• How will an extremely dirty air filter affect the amp draw of a PSC centrifugal blower motor?
• Why is it necessary for compressed air to go through a drier?
• When is the most common time to conduct a seasonal check on heating equipment?
• What role does a sightglass serve in a refrigeration system?
• Which refrigerant line in a typical residential split system installation is normally insulated?
• Why is it important to keep the temperature inside the compressor under 300°F?
• Why is it important to clean copper fittings before soldering or brazing?
• What color should the flames be in a correctly adjusted gas burner?
• Which circuit characteristics are essential for troubleshooting electrical circuits?
• How do open display cases maintain temperature without doors?
• Which material is most commonly used today for hot water piping in residential applications?
• Which type of duct system requires the shortest distance between duct supports?
• What is the most accurate dimension measured on pipe and tubing?
• What is the primary function of an air cooled condenser in an air conditioning system?
• If system pressure is significantly higher than the PT chart pressure, what does this indicate?
• To manually defrost a frozen evaporator coil, what should technicians use?
• What distinguishes brazing from soldering?
• How do ultrasonic leak detectors identify refrigerant leaks?
• A built-up refrigeration system is characterized by components that are?
• What is the preferred tool for cutting PVC tubing?
• How does air from air conditioning vents affect open display cases?
• What is an advantage of using restaurant refrigeration systems with remote condensing units?
• How can sound transitions and vibrations be minimized between the unit and ductwork in metal duct systems?
• What is a common indicator that water pumps are functioning properly in a heating system?
• Which tool is used for soldering electrical connections?
• What is a fluid called that is cooled by direct refrigeration to transfer cooling elsewhere?
• What is the advantage of an oxyacetylene torch compared to an air acetylene torch?
• Why are face shields worn during arc welding?
• After diagnosing a defective compressor, what should the technician do next?
• Why are oxyacetylene torches less preferred for soldering copper pipes?
• When does the defrost cycle normally terminate?
• What must be selected and assembled by the equipment manufacturer in a self-contained system?
• What is the term for copper tubing that comes in rigid, straight lengths?
• Why is it important to load open display cases according to the manufacturer's instructions?
• When purging the lines with nitrogen during brazing, what should the nitrogen pressure regulator be set at?
• What type of cooling system uses ACR copper tubing?
• What happens to an electric motor's amp draw when the load increases?
• Which device ensures that the evaporator pressure remains above a certain point regardless of suction pressure?
• The disconnect for a piece of air conditioning equipment should equal what?
• What is the impact of increased coil frosting in refrigerated cases during high humidity conditions?
• In restaurant refrigeration systems, why is it beneficial for remote condensing units to be used?
• Which measurement indicates an issue when testing electrical components in HVAC systems?
• A multimeter showing 31 ohms when checking the resistance of a compressor start winding indicates what?
• What type of fuses should be used for overcurrent protection of air conditioning equipment circuits?
• During planned maintenance for combustion appliances, which safety aspects should be checked?
• What is the primary purpose of using an amp meter?
• What is the role of the nitrogen holding charge during installation?
• What is the preferred method for cutting copper tubing in refrigeration systems?
• Which industry associations establish national standards for the HVAC/R industry?
• How is a compressor's rated load amp rating (RLA) determined?
• What materials are most commonly used for cold water piping in houses?
• Compared to a traditional rack system, what is a distinguishing feature of a protocol system?
• What could be a consequence of not checking the supply voltage?
• What is the procedure for heating a brazed copper joint?
• Which side of an air conditioning coil is more likely to collect dirt?
• What is the position of the unit installation valves on a split system air conditioning condenser when shipped?
• In which commercial application is evaporative cooling commonly utilized?
• How can technicians protect themselves from hot sparks produced by most welding processes?
• What is the difference between welding and brazing?
• What type of refrigeration gauges should be used on a system with a small charge?
• What is the preferred method for sealing metal ductwork?
• Before starting a new system, the technician should?
• If the evaporator in a reach-in freezer is coated with a large quantity of ice, what is the effect?
• What is a common cause of low system superheat?
• How do oxyacetylene torches cut metal?
• What is the primary reason to monitor refrigerant pressure during troubleshooting?
• What is the relative installation cost of a rack system compared to multiple cases with individual condensing units?
• What is the method used for joining soft copper tubing?
• Which refrigeration technique often relies on cooling from external sources?
• Why are controls necessary for maintaining a minimum high side pressure on outdoor air-cooled condensers?
• What is the purpose of gas regulators in an oxyacetylene system?
• How can the cells on most electronic air cleaners be cleaned?
• Why is it illegal to operate a torch with an acetylene pressure greater than 15psi?
• A refrigerated case maintaining a temperature of 28°F is classified as which type of system?
• What visual clues on a system can indicate the presence of a refrigerant leak?
• How does performing planned maintenance benefit customers financially?
• What describes the switching action of a fan cycling head pressure control?
• What is the minimum clearance required from the service access panel of a piece of equipment?
• Which parameter does a crankcase pressure regulator specifically manage?
• Which additional safety precaution is essential when working with gas torches?
• What is the main goal of planned maintenance?
• Why do acetylene cylinders contain acetone?
• Which component is critical in ensuring proper function of multiple evaporators in refrigeration?
• Why is it necessary to check refrigerant pressures?
• What advantage do ball valves have over other manual refrigeration valves?
• How is the water flow in a hydronic heating system checked?
• Thermoelectric refrigeration systems cool by passing current through?
• What is the most likely solution for a belt that vibrates and jumps during operation?
• What can be the consequence of exceeding the compressor's recommended temperature limit?
• What factors must be considered when performing a head load calculation for a walk-in cooler or freezer?
• What is the typical saturated suction temperature maintained by low temperature supermarket rack systems?
• Which material is typically used for natural gas piping?
• What regular maintenance task helps improve the efficiency of air conditioning systems?
• How much refrigerant does the condensing unit normally contain when installing a split system air conditioner?