modern refrigeration and air conditioning 20th edition review question answersBlog

modern refrigeration and air conditioning 20th edition review question answers

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Looking for Modern refrigeration and air conditioning answers 20th edition. This is because relative humidity level increases as __________.A comfort cooling system that has its condensing unit outdoors and its evaporating unit in the center of a building is a ____________ air-conditioning system.Which of the following is a type of self-contained air-conditioned unit?Which of the following window air conditioner installation steps is explained correctly?Which of the following statements regarding room air conditioner service are true?it is best to remove the air-conditioning chassis from the sleeve for service; a loose fan can cause worn fan motor bearings; never use metal blades for cleaning - pg 814To fix hard starts in a room air conditioner with a PSC compressor motor, a technician should _________.Which of the following methods are used to provide heat within a packaged terminal air conditioner?electric resistance heaters, operating as a heat pump, operating as a heat pump with electric resistance heater, gas-fired heater - pg 819Cooling only a specific, limited area is referred to as __________ cooling.When installing a ductless split system indoor unit, a __________ is typically necessary.Which of the following statements is true of multizone ductless split systems.system can have multiple indoor units attached to a single outdoor unit; can have multiple outdoor units; a popular choice for adding air conditioning to buildings that are not equipped with ducts - pg 825 & 826Which of the following statements regarding multizone ductless split systems are true?thermostat control the independent temperature in each room served; a line set connects an indoor unit and outdoor unit; a variety of different indoor unit styles are available - pg 828 & 829____________ refrigerant flow circulates only the amount of refrigerant needed for a specific load.What should be added to a ductless split system's indoor unit to prevent the growth of microorganisms?Which device is used to prevent spilling of condensate from a ductless split system's indoor unit?A standard split system that provides central air-conditioning includes which one of the following system components?Which of the following best describes a field-erected air-conditioning system?the parts of the system are purchased separately and then assembled on-site - pg 837Which of the following statements regarding split systems are true?the air handler, furnace, and evaporator coil are installed indoors and the condensing unit is installed outdoors; an evaporator coil can be installed in the supply plenum of a forced-air heating system in order to add cooling capacity; the supply and return ductwork does not pass through the building's exterior wall - pg 838An air-cooled condensing unit should be installed ___________.beyond a building's roof overhang and eaves - pg 844block off areas of the plenum so all the air passes through the evaporator - pg 845Which of the following statements regarding refrigerant lines are true?a liquid line should be insulated to prevent condensation; may be connected with flare connections; should be kept as short as possible - pg 845 & 846The electrical connections to a central air conditioning condensing unit typically include a 240 volt connection for powering the compressor and the ____________ connection for control.The best and most thorough way to clean an evaporator coil with clogged cooling fins is to _____________.remove the coil from the plenum chamber and steam clean it - pg 852An inverter controls a variable-speed compressor by changing the electrical signal's __________.Refrigerant flow through indoor units of VRF systems is typically controlled by a(n) _____________.Which of the following is a trait of a packaged outdoor air-conditioning unit?the supply and return ducts pass through the exterior wall of the building - pg 860A rooftop unit may provide heat for the indoor climate using the following methods:integrated gas-fired furnace, oil-fire furnace, or electric resistance heating elements - pg 861A rooftop unit can provide "free cooling" if it is equipped with a(n) ____________.High humidity outdoors can prevent a rooftop unit's free cooling operation when the system has _________ control.In a commercial HVAC system, if the thermostat's switch controls a liquid line solenoid valve, which control usually cycles off the compressor?A pneumatic control system uses _________ for device actuation.A large RTU is most frequently conveyed to a rooftop using __________.A ______________ installed between the base rail of a rooftop unit and the top edge of the roof curb prevents water from leaking through the opening.Which of the following is a valid safety precaution of servicing a rooftop unit?before working on equipment, secure hinged panels in the open position; extend the top of the ladder 3' above the edge of the roof; use a rope to lift equipment, tools, and refrigerant cylinders to the roof - pg 871VRF in split commercial air-conditioning systems can effectively match cooling capacity by ___________.A chiller system uses a loop of __________ to provide cooling to a conditioned space.The secondary refrigerant used in a chiller system ____________.circulates through the conditioned space to provide cooling - pg 873Reciprocating compressors are capable of capacity control through ___________.If a chiller system could only use one compressor but needed to provide 2000 tons of cooling capacity; which type of compressor is most likely to be used?A compression chiller economizer improves system efficiency by ______________.subcooling high-side refrigerant before entering the evaporator - pg 883The purpose of a cooling tower connected to an HVAC system is to _____________.All of the following water valves provide variable water flow control:pressure water valves and thermostatic water valves - pg 891 thru 894The operation of a pressure water valve is in reaction to _____________.While compression systems use mechanical energy to power refrigeration, absorption systems use __________ energy to do the same.In an absorption system, a substance that soaks up the refrigerant returning from the evaporator is called the __________.Which of the following is the process in which a solid attracts and holds a substance on its outer surface?Which of the following is the process in which a substance attracts and combines with another substance to form a uniform solution?When an absorption system is operating, high pressure is maintained in the ___________.When a solution in an absorption system is saturated with refrigerant, it is a(n)____________ solution.In an absorption system, refrigeration is boiled out of the refrigerant-absorber solution in the _____________.Which of the following may be used for a heat source in absorption chillers?In a residential absorption chiller, the __________ is installed in the air handler plenum.When an absorption heat pump is in heating mode, ____________.Which of the following statements regarding an indirect-fired absorption system is true?steam, hot water, or hot gas is produced away from the system and delivered through pipes - pg 907Which of the following best explains the differences between a double-effect adsorption system and single-effect adsorption system?a double-effect absorption system has both a primary and secondary generator - pg 907Which of the following are true when an absorption system changes from cooling to heating mode?one or more valves change position; cool water is passed through the coil in the evaporator; the generator produces heat; water sent to the conditioned space is warmed - pg 907Using waste heat from one process to power another process is referred to as __________.For servicing ammonia absorption systems, it is important that the gauge manifold, valves, lines, and fittings used should never be made of ____________.A water and lithium bromide solution should not be exposed to air to prevent the solution from becoming ____________.Roof misting and roof ponds are examples of __________ cooling systems.The ratio of the moisture content in the air compared to the maximum amount of moisture that the air can hold at its current temperature is called _____________.When humidity is too high in a building, the following events may occur:growth of mold, bacteria, and fungus; formation of condensation on cold surfaces; swelling of hygroscopic materials - pg 926When a humidifier adds moisture to air already heated by a furnace, the temperature of the air __________.Being a measure of ventilation rate, ___________ refers to the replacing of the entire volume of air in one hour.A humidistat is a control device that responds to changes in conditioned space humidity by doing the following tasks:modulate dampers and air mixers, turn on or off a dehumidifier; turn on or off a humidifier - pg 927A traditional electromechanical humidistat senses humidity using a(n) ____________.Humidifying an entire building's conditioned space, central humidifiers are categorized by the following installation types of humidifiers:The following humidifiers are categorized as atomizing:nozzle-type, impeller-type, and piezoelectric (ultrasonic) - pg 931Using their own heat source (electric heaters), ____________ humidifiers add moisture to air by creating steam.Central humidifiers are typically supplied with water from __________.Moisture from air passing through a dehumidifier condenses on its ___________.Before condensation spills out of a dehumidifier, its ____________ shuts off the compressor, stopping the production and accumulation of moisture.To prevent or undo the blocking of airflow through a dehumidifier, the __________ shuts off the compressor.Special chemicals exposed to conditioned air to adsorb moisture and release it outside of the conditioned space are called ___________.Why must the overflow outlet of a whole house humidifier be installed at least 1" above an open drain?the gap prevents drain water from being siphoned back into the potable water supply - pg 936A sensing device that reacts to temperature change is a ______________.A common temperature-sensing component that reacts to temperature change by changing shape to actuate a reed switch or mercury switch is a ____________.To reduce or eliminate electrical arcing in an electrical control, use ______________.a long bimetal strip coiled tightly; magnets to pull in electrical contacts; a mercury switch - pg 942What is the condition called in which the residual heat blown through the ductwork raises the temperature of the conditioned space above the thermostat set point after a heating thermostat has shut off a furnace?The total difference of the high and low temperature in a room, including values below the cut-in temperature and above the cut-off temperature, is called _____________.A condition in which a furnace turns on but the temperature of a room drops too low before the heating effect is felt is called ____________.The devices used by mechanical heating thermostats to turn on early enough to prevent temperature from dropping below its cut-in set points are called ___________.The devices used by mechanical cooling thermostats to turn off early enough to prevent system overshoot or temperatures below the thermostat set points are called ____________.A combination thermostat is used to control a(n) ___________.A gas furnace with a multistage thermostat uses __________ to control its heat capacity.Line-voltage thermostats typically operate at ___________.Low-voltage thermostats typically operate at __________.Low-voltage thermostats often use _________ to switch and control high current, line-voltage devices, such as fans and compressors.The temperature-sensing component that reacts to temperature change by changing its electrical resistance is a ____________.To calculate the amperage load that a low-voltage thermostat's step-down transformer can handle, perform the following calculations: ____________.A millivolt thermostat generates its own electric current from heat applied to its __________.Millivolt thermostats can be used to control _____________ systems.Being able to adjust conditioned space temperature remotely using a tablet PC, smartphone, or laptop is specifically an advantage of a ________ thermostat.Tapping into a fan, cooling, or heating terminal and drawing a small milliamp current to recharge its internal battery is a feature of a ___________ thermostat.A programmable thermostat uses a(n) ___________ the functions as a clock and controls indoor climate for different blocks of time.The thermostat wiring designation for cooling mode is __________.The thermostat wiring designation for power from the step-down transformer is __________.The thermostat wiring designation for heating is __________.The thermostat wiring designation for the fan relay is __________.The thermostat wiring designation for energizing a heat pump's reversing valve is ___________.When installing a thermostat's subbase, some system settings may need to be managed using ________ switches.When outdoor air is low in temperature and humidity, a forced-air system can provide free cooling by using the following components, except ____________.A good location where a thermostat should be installed is ____________.When taking measurements on an energized circuit for low-voltage thermostat diagnostics, set a multimeter to the ________ setting.The taking measurements on an energized circuit for low-voltage thermostat diagnostics, a 0 volt reading indicated a(n) _____________.In a forced-air system, zone controls prominently use ________ to regulate the temperatures of the different zones.In a forced-air zoned system, what device operates to regulate airflow and compensate for when one of several zone dampers closes?When pressure from airflow is reduced, most barometric dampers close due to____________.In a forced-air zoned system, a ___________ opens when temperature right above the evaporator coil drops to around 33 degree Fahrenheit.After speaking with the customer, begin a service call for troubleshooting a forced-air zoned system by ____________.Most local building codes require that heat loads for residential buildings be performed in compliance with the ACCA ________ specification.Which of the following heat loads is not considered when calculating heating loads for a building?Which of the following heat loads would be considered only when cooling loads are being calculated?A material's ___________ indicated how much heat will transfer through one square foot of the material one inch thick in one hour when there is a 1 degree Fahrenheit difference between the two sides of the materials.Which of the following accounts for the insulating effect of boundary air films?The rate at which heat is transferred through a wall be conduction is dependent on the materials the wall is made of, the area of the wall, and ________.For a heating load calculation, heat transfer through basement walls is only considered if the basement __________.Heat loss due to construction of a concrete slab on grade is calculated based on __________.Because a vented crawl space is exposed to outdoor air, heat loss through a floor over a crawl space is calculated the same as that of a(n) ____________.Adding weather-stripping to all doors and windows, using building wrap and plenty of insulation during construction, and using a fresh air intake for positive pressure in a building are effective methods of reducing ______________.Heat loss or gain due to infiltration and exfiltration is dependent on __________.The relative ability of a surface to allow light rays to pass through describes ________.Which of the following heat distribution methods relies on only natural convection to distribute heated air?Which of the following is not a basic component of a gas-fired furnace?In a condensing furnace, circulating air passes over the ________ before passing over the primary heat exchanger.Secondary heat exchangers are frequently made of stainless steel because they __________ other metals.Unlike a non-condensing furnace, a condensing furnace can use ________ for its exhaust flue.Non-condensing furnaces typically have an AFUE rating between ___________.Which of the following statements regarding direct-drive blowers is true?Which of the following best describes the function of a combustion blower?The two types of combustion blowers are __________ blowers.If a house is built with the furnace in the basement and the ductwork running above the furnace, a(n) _____________ furnace would most likely be installed.Which of the following statements regarding two-stage furnaces is not true?The purpose of a(n) _____________ is to control and regulate the necessary intake of fresh air into a building.A __________ furnace can control its heat output from 40% to 100% of their total capacity.When a furnace responds to a call for heat, there is usually a brief delay before the blower activates that ___________.Which of the following statements about unit heaters is not true?Which of the following is not an advantage of hydronic heating systems compared to force-air heating systems?Which of the following statements comparing steam and hot-water hydronic systems is not true?What is the reason that conventional boilers operate with a water temperature above 140 degrees Fahrenheit?Boiler heat exchangers are typically made out of ___________.Which of the following types of water treatment forms a protective coating on the surfaces of a hydronic system?The release of dissolved gasses from water in a hydronic system is known as ___________.The purpose of an expansion tank is to ___________.Which type of hydronic system valve prevents hot water from migrating to higher points in the system when the circulating pump quits operating?Which type of hydronic system valve helps to distribute heat equally throughout the system?Which of the following statements about terminal units is not true?Air vents are designed to _________ from a hydronic system.A ___________ hydronic system is similar to a series loop system, except that its terminal unit are on branch circuits, called secondary loops.Which of the following hydronic system designs provide the most consistent heat at the terminal units?Why is a reverse hydronic system the design that is the easiest to balance?In a zoned hydronic system, each zone has its own __________.Which of the following statements about radiant hydronic systems is not true?A __________ hydronic system has separate supply and return pipes for hot and cold water.A two-pipe steam heating system has __________ that allows condensed water to return to the boiler, but prevent steam from passing.Which of the following best describes the function of an air vent in a steam heating system?All boilers have a(n) ____________ that automatically shuts off the fuel oil supply if the water temperature or pressure gets too high.If a hydronic system is operating with a reduced water level, the ________ may open the makeup water valve to add water to the system.Which hydronic system control monitors the cycle time required to satisfy a call for heat?When joining tubing of different sizes, a technician should use a(n) ____________Where should an air vent be installed on a one-pipe steam heating system?Which of the following is not a step in preparing a hydronic system for initial start-up?Which of the following can prevent a boiler from firing?Which of the following best explains the difference between system purging and system bleeding?A waterlogged expansion tank may cause the __________ valve to release water every time the boiler cycles on.A steam boiler's water level sight glass should be _________ to one-half full.Which of the following is not a step in preparing a boiler for operation before the heating season begins?When a heat pump switches from heating to cooling mode, _________.When a heat pump is operating in heating mode, the outdoor coil ________.In a heat pump, the direction of refrigerant flow through its compressor ___________.The two main types of air-source heat pumps are __________ heat pumps.Which of the following statements about air-source heat pumps is true?A(n) ___________ heat pump uses a water coil to transfer heat between the refrigerant and the ground or water loop.The amount of liquid refrigerant in a charge compressor tank is affected by the temperature of the __________, which runs through the center of the tank but does not open inside it.A crankcase heater helps protect a heat pump compressor from __________.In a heat pump system with two thermostatic expansion valves, a __________ is installed in tubing parallel to flow in both directions.A bi-flow thermostatic expansion valve ___________.The tubing stub on a reversing valve that is by itself on one side is always connected to the __________.A pilot-operated reversing valve changes valve position by ____________.The term coil refers to tubing that carries refrigerant, and the term loop refers to the tubing that _________.A water loop should be submerged at least ___________ feet deep in a pond or lake.Which heat pump thermostat wiring terminal is used to control the reversing valve?A heat pump's defrost cycle is typically initiated by ________.The point at which a heat pump's output equals the heat loss of the conditional space is the __________.In an air-source heat pump, electric resistance heaters may be used for ___________.In which of the following situations should auxiliary heat not be used?

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