The aspect of air conditioning that is responsible for replenishing stale indoor air with outside air is __________________.
a. heating
b. cooling
c. ventilation
d. humidification
e. air circulation
c
Which of the following is NOT a characteristic of a dual duct system?
a. It provides a constant volume air circulation rate in each zone.
b. It provided good control of space conditions.
c. It can handle many more zones than a multi-zone system.
d. It is
e
Which of the following statements about multi-zone air-handling systems is TRUE?
a. The cooling and heating coils are installed in-line with each another.
b. The hot deck and cold deck dampers open simultaneously.
c. When the hot deck is fully opened, the
c
An air handling unit that draws in room air, conditions it, and then returns it into the room uses:
a. fixed percentage outdoor air circulation
b. full recirculation
c. 100% outdoor air circulation
d. mixed air circulation
e. blended circulation
b
The ______________ is a unitary air conditioning system that uses a direct expansion refrigeration system to provide cooling and dehumidification, serving a local area without using ductwork.
a. unit ventilator
b. rooftop unit
c. window air conditioner
d.
c
The terminal reheat air handling system has very high energy consumption because:
a. the large volumes of air that it must supply.
b. the resistance to flow created by the duct work.
c. excessive air leakage and air seepage in the ductwork.
d. it cools th
d
Buildings require heat sources to:
a. offset the heat gain from the atmosphere.
b. replace the ventilation air.
c. reduce the humidity of the outside air.
d. replace the exhaust air.
e. offset the building's heat losses.
e
The most common system installed in most residences where the furnace is located in the basement and provides conditioned air via ducts to each room is called a:
a. forced air system.
b. single zone, constant air volume system.
c. low velocity terminal re
a
Which of the following statements about the unit ventilators is FALSE?
a. The units are used in areas with limited available floor space.
b. The units provide individual room temperature control.
c. The units provide cooling only.
d. The units provide hea
c
The condensate that drains from the evaporator of a window air conditioner is:
a. drained on the floor.
b. drained to a pan below the condenser fan where it is thrown against the condenser coil and evaporates.
c. piped to a drain on the evaporator side of
b
Free Cooling," with regard to HVAC system operation, refers to:
a. recycling of 100% return air to minimize cooling and dehumidification.
b. manipulating mixed air dampers on cooler days to eliminate the need for mechanical cooling.
c. manipulating mixed
b
To offset the heat gain through the building's exterior shell from solar radiation, the atmosphere surrounding the building, and the internal sources of heat (internal and external heat gains) a building requires __________________________.
a. a humidifie
d
Which of the following air handling systems is not appropriate for a single zone application?
a. A packaged air conditioner.
b. A dual duct system.
c. A unit ventilator.
d. A rooftop unit.
e. A single zone constant air volume system.
b
Which of the following air handling systems is not suitable for providing cooling simultaneously to several distinct locations in a building?
a. A roof top unit.
b. A dual duct system.
c. A low velocity terminal reheat system.
d. A high velocity terminal
a
When air-handling units use hot water heating coils, energy can be saved by:
a. shutting of the hot water circulating pump when the air temperature setpoint is reached.
b. switching over to electric heat when the outside air temperature drops excessively.
e
The provision of outside air into a building does not:
a. provide "makeup" air.
b. replenish the oxygen supply.
c. dehumidify or humidify the air.
d. remove odours.
e. ventilate the building.
c
Which one of the following statements about central air conditioning systems is FALSE?
a. Unitary systems are able to control noise and vibration better than central systems.
b. All the major equipment in central systems is located in a central mechanical
a
A small residence located in a tropical climate may require which of the following elements of an air conditioning system:
(choose all that are correct)
1. heating
2. cooling
3. humidification
4. dehumidification
5. ventilation
2, 4, 5
Which of the following statements about air handling units is TRUE?
a) In any system the air is mainly conditioned in the units.
b) The units can only heat air.
c) The units only circulate.
d) For each function there needs to be a separate air handling un
a
A system used extensively in hotels and motels due to its minimal space requirement, relatively low initial cost and high degree of individual zone control is called:
a. A hydronic heat pump system.
b. An induction system.
c. A variable volume system with
d
An HVAC system that provides cooling and heating all year round is highly energy efficient but has a high initial cost. The system consists of two separate supply and return piping systems that are connected to separate coils". Which of the following sys
b
To maintain space conditions during heating this system zone thermostat reduces the air flow to a minimum of 20% before modulating the output of the heat supply.
a. Hydronic heat pump system.
b. Fan coil unit with make-up air system.
c. Variable air volum
c
With regard to air conditioning, an induction system gets its name from:
a. the way air in the room is mixed with the supply air.
b. the type of fan coils used.
c. the type of air handling unit used.
d. the air used in the central element of the system.
e
a
Locating HVAC equipment in mechanical rooms is preferred:
a. so that larger equipment can be used.
b. to make the maintenance easier.
c. so that maintenance may be performed without disturbing occupants.
d. to make maintenance more difficult.
e. so that a
c
The constant volume system with perimeter heating provides air from the air-handling unit in the central mechanical room at approximately:
a. ambient air temperature
b. 22�C
c. 10.5�C
d. 12.5�C
e. 15�C
d
A common complaint against the fan coil unit with make-up air is:
a. the response is very slow when first turned on.
b. the unit must be shut off when the room is unoccupied.
c. the fan noise is excessive.
d. the fan stirs up a great deal of dust.
e. the
c
In a central air conditioning system, supplementary units are located in each zone to provide additional __________________.
a. ventilation
b. humidity Control
c. air circulation
d. heating
e. filtering
d
For which HVAC system is the central fan usually provided with variable inlet vanes, so that the air supply duct pressure can be maintained at a setpoint?
a. Variable air volume system.
b. Hydronic heat pump system.
c. Dual duct system.
d. Fan coil unit w
a
Which of the following statements about hydronic heat pump HVAC system is FALSE?
a. The unit discharges heat to the water piping system during the cooling mode.
b. The water temperature must be between 15�C and 32�C.
c. Pipe insulation is not required as
e
Which of the following statements is FALSE for an induction HVAC system?
a. The ratio of secondary air to primary air flow is typically 4 to 1
b. The room thermostat modulates the flow of chilled or hot water to the induction unit coil
c. The primary air
d
Which of the following statements about fan coil units combined with make-up air systems is FALSE?
a. The units include a disposable filter, fan and heating/cooling coil.
b. Ventilation is provided by a 100% outside air system.
c. The air handling unit in
e
Which of the following statements about two-pipe arrangements is FALSE?
a. The arrangement is the least costly.
b. Piping is connected to the boiler during winter.
c. Piping is connected to the chiller during summer.
d. The arrangement is made up of a sup
e
Which statement about compartmental variable air volume HVAC systems is FALSE?
a. Smaller air handling units are located on each floor replacing a larger central unit
b. Each air handling unit is installed in a mechanical room for noise reduction, safety
d
Which of the following statements about variable volume HVAC system with perimeter heating is FALSE?
a. Air is supplied at a temperature of about 12.5�C.
b. Room temperature is controlled by the volume of air supplied.
c. The supply air duct pressure vari
c
Which of these statements about hydronic heat pumps is TRUE?
a. The units discharge heat to the water piping during the cooling mode.
b. The piping must be insulated.
c. The water temperature is below the dewpoint of the room air.
d. Condensate drains fro
a
Which of the following components of an air handling system is not likely to be found in a typical constant air volume system when combined with perimeter heat?
a. Cooling coils.
b. Heating coils.
c. An air mixing section.
d. Filters.
e. A humidifier.
b
While addressing the building function factors of an HVAC system, a designer considers:
a. operating costs.
b. operation staff's prior experience and familiarity with the HVAC system.
c. normal occupancy periods.
d. maintenance requirements.
e. capital co
c
In a constant air volume system with perimeter heating which of the following elements are fluids in the air handling unit?
(choose all that are correct)
1. Heating coils
2. Cooling coils
3. An air mixing section
4. Filters
5. A humidifier
6. A dehumidifi
2, 3, 4, 5
The funds available for the air conditioning portion of the building refers to which factor of system selection?
a) Building function
b) Capital cost
c) Building layout
d) Operating costs
e) Maintenance requirements
b
If operating personnel from an old building are going to be transferred to the new building the system installed in the new building will be the same as in the older building because all the personnel are familiar with that system. This type of system sel
a
When choosing an air conditioning system for a building, "building function" is an important aspect to consider. Which of the following factors would be considered under the "building function" aspect?
(choose all that are correct)
1. Physical size of the
3, 5, 6
Which of the following is a disadvantage of heat pipe heat recovery systems?
a. Heat pipes have high maintenance requirements.
b. Heat pipes suffer from cross-contamination of the air streams.
c. Heat pipes have high power consumption.
d. A side-by-side d
d
A system consists of two finned tube heat exchangers. Where is the preconditioning coil of this system located?
a. On the suction side of the pump.
b. On the discharge side of the 3-way mixing valve.
c. In the duct work handling outside air.
d. At the end
c
What is the name of the heat recovery system that consists of two finned tube heat exchangers?
a. A run around system.
b. A heat valve.
c. A heat pump.
d. A heat tube.
e. A thermal wheel.
a
The heat recovery system which has a capillary wick structure consisting of fine circumferential striations machined on its internal surface is called:
a. a heat valve.
b. a run around system.
c. a heat pump.
d. a thermal wheel.
e. a heat pipe.
e
The performance of a heat pump system (or C.O.P.) is the ratio of:
a. Heat output divided by heat input.
b. Heat input divided by energy output.
c. Energy input divided by energy output.
d. Energy input divided by heat output.
e. Heat output divided by en
e
Which of the following statements about run around heat recovery systems is FALSE?
a. Installation costs are comparatively low.
b. The system is readily adaptable to retrofit applications.
c. Piping is not required in the system.
d. The exhaust and ventil
c
A refrigeration system used in HVAC service, that can provide both heating and cooling, is a:
a. Run around system
b. Heat valve
c. Heat pump
d. Regenerative system
e. Thermal wheel
c
When is the capacity of a heat pipe at a maximum?
a. When the evaporator is lowered below the horizontal
b. When the evaporator is raised above the horizontal
c. When the system is placed vertically with the evaporator on top
d. When the system is placed
a
The heat recovery system which makes use of an underground heat exchange coil is called a:
a. Run around system
b. Thermal wheel
c. Heat tube
d. Heat pump
e. Heat pipe
d
Cross contamination is a disadvantage for which of the following heat recovery systems?
a. A run around system
b. A heat pipe
c. A heat tube
d. A thermal wheel
e. A heat valve
d
The heat recovery system that employs a single exchange unit consisting of a casing split into two sections and a segmented rotating wheel 300 mm thick and 1 to 3.7 m in diameter is called _______________.
a. a run around system
b. a thermal wheel
c. a he
b
The run around coil heat recovery system uses a _____________ coil in the inlet air duct and a _____________ coil in the exhaust air duct.
a. preconditioning, recovery
b. heating, cooling
c. cooling, heating
d. recovery, conditioning
e. heating, recovery
a
The system which runs as a refrigeration system used for air conditioning purposes in the summer and can be modified to run in reverse in cooler weather is called _________________.
a) a runaround system
b) a heat valve
c) a heat pump
d) a heat pipe
e) a
c) a heat pump
?????????
ch. 134 - pg. 506-507
The fact that the system can be treated against corrosion is an advantage for _________________ system.
a) a run around system.
b) a heat pipe.
c) a heat pump.
d) a thermal wheel.
e) a heat valve.
b
In an HVAC air-handling unit, temperature control that uses face and bypass dampers:
a. Closes the bypass damper and opens the face damper to direct air through the coil.
b. Closes both the bypass damper and the face damper to direct air through the coil.
a
What should be done to prevent the compressor in a cooling system from starting and stopping too frequently?
a. Start and stop the compressor with a setpoint thermostat.
b. Turn off the compressor when temperatures required for conditioning are reached.
c
d
A variable air volume HVAC system requires static pressure control on the ___________ air duct system.
a. return
b. supply
c. ventilation
d. exhaust
e. recycled
b
In an HVAC system, to provide a two-position damper with manual proportional control, a/an _________________ is required.
a. gradual switch
b. offset returned air duct
c. air mixer
d. variable air volume box
e. variable frequency motor drive
a
In extremely cold climates, it may be necessary to _________________________ in an HVAC system.
a. increase the temperature controller's throttling range
b. close the outdoor air dampers
c. install two separate pre-heater coils
d. heat the dampers
e. spra
c
In an HVAC system, a differential pressure controller maintains supply air duct static pressure constant by:
a. modulating the position of the relief air damper.
b. decreasing air temperature.
c. modulating the damper on the suction side of the fan.
d. mo
c
When the outdoor air damper of an HVAC system opens to increase the flow of fresh air, the return air damper:
a. opens to reduce the recirculated air.
b. opens to increase the recirculated air.
c. closes to increase the recirculated air.
d. closes to redu
d
see 63
When the outdoor air damper increases the flow of fresh air, which of the following is TRUE?
a) The return air damper throttles up to reduce the volume of recirculated air.
b) The return air damper throttles up to increase the volume of returned air.
c) T
d
see 62
The outdoor air inlet damper of an HVAC air handling unit may be split into two parts to provide:
a. extra outside air when extra ventilation is required.
b. a means of controlling building static pressure.
c. minimum outside air during periods when maxim
e
HVAC control systems maintain minimum _____________ air during periods of extreme high and low ambient temperature.
a. return
b. supply
c. ventilation
d. exhaust
e. recycled
c
A main advantage of steam grid humidifiers over steam pan humidifiers in HVAC systems is?
a. Steam grid humidifiers can use inexpensive 2-position controls.
b. There is minimal response-time lag with steam grid humidifiers.
c. Steam grids can achieve high
b
Why is the positioner for the outdoor air damper of an HVAC air handling unit interlocked with the supply fan?
a. So the damper will close when the fan starts.
b. So the damper will open when the fan starts.
c. So the fan starts when the damper opens.
d.
b
Which of the following is not a correct method of heat regulation?
a) Direct modulation of the control valve on the steam or hot water to the heating coil.
b) Modulating the position of a 3-way mixing valve on the hot/cold water line into the coil.
c) Mod
e
Air conditioning with respect to heating coils is achieved in which of the following ways?
A) A combination of tempering control functions.
B) The selected mixing of warm return air and cooler outside air.
C) Selective heating by passing air through the h
E) All of the above.
Dehumidification is achieved by:
a) absorbing the moisture with a sponge filter.
b) absorbing moisture with a chemical drying agent.
c) cooling the air to a corresponding dew point temperature.
d) heating air to a corresponding wet bulb temperature.
e) sa
c
When complete control systems become very complex, which control signal medium is preferred?
a) Pneumatic
b) Electric
c) Electronic
d) Digital
e) Fibre optic
a
A kitchen exhaust fan reduces the calculated heat gain from the cooking appliances it serves, by a factor of _________%.
a. 10%
b. 25%
c. 50%
d. 60%
e. 75%
c
Heat is lost from a building in the following 3 ways:
a. Convection, Evaporation & Radiation
b. Infiltration, Condensation & Conduction
c. Evaporation, Conduction & Radiation
d. Conduction, Radiation & Convection
e. Infiltration, Evaporation & Convection
d
Two methods of calculating air infiltration into a building are the:
a. crack and solar method.
b. air change and solar method.
c. crack and conduction method.
d. air change and crack method.
e. conduction and solar method.
d
The quickest method of calculating air infiltration into a building is the:
a. air change method.
b. crack method.
c. solar method.
d. conduction method.
e. building pressurization method.
a
The ventilation rate of a building is determined based upon the greater of the:
a. solar heat rate and CFM rate per person.
b. conduction rate per person and solar heat rate.
c. CFM rate and conduction rate per person.
d. infiltration rate and CFM rate pe
d
Heat gains by conduction are calculated on the assumption that:
a. solar heat varies from hour to hour as sun changes position.
b. solar heat should be considered separately.
c. construction details are irrelevant.
d. the "U" value is not used.
e. heat is
b
Thermal transmission may be defined as the:
a. quantity of heat flow per unit time (in Watts).
b. ability of a material of uniform thickness to transmit heat (W/m�C).
c. heat transfer through a one-metre cross-sectional area of a particular material with
a
Thermal conductivity (?) may be defined as the:
a. quantity of heat flow per unit time (in Watts).
b. ability of a material of uniform thickness to transmit heat (W/m�C).
c. heat transfer through a one-metre cross-sectional area of a particular material w
b
Heat load from people in a room is mostly affected by:
a. the size of the people.
b. smoking.
c. the number of people.
d. the activity of the people.
e. the building occupancy class.
d
Thermal resistance (R) may be defined as the:
a. quantity of heat flow per unit time (in Watts).
b. ability of a material of uniform thickness to transmit heat (W/m�C).
c. heat transfer through a one-metre cross-sectional area of a particular material wit
e
To calculate the heat gain from fluorescent lighting, add the wattage ratings of the lamps and multiply by ___________.
a. 0.2
b. 0.5
c. 4.1
d. 1.2
e. 2.1
d
Heat lost from a building is:
a. dependent on the shape of the openings in a building
b. independent of indoor air temperature
c. greater on windier days
d. independent of outside temperature
e. dependant on barometric pressure
c
Thermal transmittance (U) may be defined as the:
a. quantity of heat flow per unit time (in Watts).
b. ability of a material of uniform thickness to transmit heat (W/m�C).
c. heat transfer through a one-metre cross-sectional area of a particular material
d
Electric motors give off _____________ while running.
a) sensible heat
b) latent heat
c) latent and sensible heat
d) no heat to the atmosphere
e) solar heat
a
A thermal wheel heat recover system is rarely used in hospitals because:
A) of low heat recover rates.
B) a large space is required for installation.
C) of cross-contamination.
D) frost may form on the wheel during cold weather.
E) only sensible heat is r
C) of cross-contamination.
What causes the liquid refrigerant in the cold end of a heat pipe to move back to the hot end?
A) an impulse pump.
B) gravity.
C) thermal action.
D) the 1st law of thermodynamics.
E) capillary action.
E) capillary action.
In this type of air conditioning system, the air handling unit provides ventilation and cooling while supplemental heat and additional cooling is provided by equipment in each zone.
A) modular system
B) unitary system
C) combined system
D) central system
C) combined system
ch. 133 - pg. 475
What type of piping system provides the best temperature control in a combined air conditioning system?
A) one-pipe
B) two-pie
C) three-pipe
D) four-pipe
E) five-pipe
D) four-pipe
In an induction style combined air conditioning system, what supplies the supplemental heat or cooling?
A) induced air movement.
B) a rehead coil.
C) the make-up coil.
D) individual room coils.
E) an air washer.
D) individual room coils.
Bypassed air during the heating and cooling seasons reduced which of the following air conditioning functions in a multi-zone central air conditioning system?
A) heating control
B) cooling control
C) humidity control
D) filtration control
E) ventilation c
C) humidity control
ch. 132 - pg. 469
When does the capacity of a heat pipe decrease to zero?
A) at minus 10�C.
B) when RH approached 0%.
C) when the effects of gravity overcome the effects of the capillary action.
D) when the temperature differential is greater than 10�C
E) when the vapour p
C) when the effects of gravity overcome the effects of the capillary action.
In a single duct air conditioning system, what responds to static duct pressure changes?
A) a pressure sensor.
B) a differential pressure controller.
C) a resistive pressure device (RPD).
D) an airflow sensor.
E) a fan unloader.
B) a differential pressure controller.
The simplest heat pump operating principle reverses the cooling medium flow instead of the refrigerant. What type of heat pump is this?
A) Air-to-Air heat pump.
B) Water-to-Air heat pump.
C) Water-to-Water heat pump.
D) Earth-to-Air heat pump.
E) Air-to-E
C) Water-to-Water heat pump.
Regarding a heat pipe, to what is the Second Law of Thermodynamics applicable to?
A) the movement of the vapour from one end to the other.
B) the amount of heat rejected.
C) the rate of evaporation of the volatile liquid.
D) the wicking action of the inte
A) the movement of the vapour from one end to the other.
How does a Variable Air Volume air conditioning system differ from a Constant Air Volume system?
A) they differ in the way that the air is heated.
B) they differ in the way that the air is preconditioned.
C) they differ in the way that the air is diffused
D) they differ in the way that room conditions are maintained during cooling.
?????????????? slightly odd wording
textbook Ch. 133 - pg. 480
In a large air conditioning system, what method of providing cooling is more economical?
A) A chilled water system.
B) A direct expansion coils.
C) Air washers.
D) Heat pumps.
E) Evaporative cooling.
A) A chilled water system.
Which of the following is not an arrangement for introducing intake air into an air handling unit?
A) mixed air.
B) fixed recirculation.
C) 100% outside air.
D) full recirculation.
E) fixed percentage outside air.
B) fixed recirculation.
ch. 132 - pg. 462
What type of heat pump does not work well when the outdoor temperature is low?
A) steam-to-air
B) water-to-air
C) earth-to-air
D) air-to-air
E) water-to-water
D) air-to-air
The term HVAC stands for:
A) high voltage alternating current.
B) high velocity air controller.
C) heating, ventilation, and air conditioning.
D) heavy, viscous, aromatic crude.
E) heating, ventilation actuator controller.
C) heating, ventilation, and air conditioning.
How is a dual duct air conditioning system different from a multi-zone system?
A) The multi-zone system is a variable volume system.
B) The dual duct system doesn't have good year round humidity control.
C) The dual duct system has no means of pressure re
D) Hot and Cold air are blended in a mixing box located in each zone.
Which of the following air conditioning systems is better suited for retrofit in a large building?
A) terminal reheat, low velocity
B) multi-zone
C) single zone, constant air-volume
D) dual duct system
E) terminal reheat, high velocity
E) terminal reheat, high velocity
In a large air conditioning system, which type of humidifier would be used?
(choose all that are correct)
1. freestanding humidifiers.
2. steam grid humidifiers.
3. wetted element humidifier.
4. steam pan humidifiers.
2 & 4
How is static air pressure maintained in a VAV (with perimeter heat) combined air conditioning system?
A) the VAC boxes.
B) supplemental air supply.
C) the output of the supply fan is controlled.
D) dual pressure regulators.
E) overpressure relief devices
C) the output of the supply fan is controlled.
ch 133 - pg. 481
What is the name of the air conditioning system that has all the major equipment located in one mechanical room?
A) A packaged system.
B) A central system.
C) A combined system.
D) A multi-zone system.
E) A dual duct system.
B) A central system.
Central air conditioning systems have several advantages. One of the advantages is:
A) they are relatively inexpensive when compared to unitary systems.
B) noise and vibration are easier to control.
C) not a lot of space is required for the system compone
B) noise and vibration are easier to control.
What is leakage of air into a building called?
A) infiltration
B) ventilation
C) air change
D) exhaust rate
E) U-factor
A) infiltration
A cooling unit for a computer room is a type of what?
A) Window air conditioner.
B) Central air conditioning unit.
C) Unit ventilator.
D) Rooftop unit.
E) Packaged air conditioner.
E) Packaged air conditioner.
ch. 132 - pg. 464
The fact that the system can be treated against corrosion is an advantage for which system?
A) A runaround system.
B) A heat pipe system.
C) A heat pump system.
D) A thermal wheel system.
E) A heat valve system.
B) A heat pipe system
Whether an air-water wash will humidify or dehumidify depends on:
A) the directions of the spray flow versus the air flow
B) the humidity of the supply air
C) the spray pattern
D) the set point on the humidistat
E) the temperature of the spray water
E) the temperature of the spray water
ch. 135 - pg. 523
Which are the main applications of heat pipes?
(choose all that are correct)
1. air to water
2. process to process
3. ground to air
4. comfort to comfort
5. process to comfort
2, 4 & 5
ch. 134 - pg. 499-500
What else must an air conditioning system do besides provide adequate heat?
A) it must be able to provide different levels of heat to different zones
B) it must effectively distribute the heat
C) it must be able to dehumidify
D) it must be able to temper
B) it must effectively distribute the heat
In a unit ventilator, what is the coil used for or as?
A) It is used for humidification.
B) It is used as a condenser.
C) It is used as the evaporator.
D) It is used used for heating/cooling.
E) It is used for flow control.
D) It is used used for heating/cooling.
Which type of combined air conditioning hot water/chilled water piping system cannot provide heating and cooling functions at the same time?
A) four-pipe
B) five-pipe
C) three-pipe
D) one-pipe
E) two-pipe
E) two-pipe
ch. 133 - pg. 476
Where is the preferred location for a hydronic heat pump unit in the building?
A) above corridors
B) in each zone
C) in each room
D) in a central mechanical room
E) wherever it is convenient to place it.
A) above corridors
ch. 133 - pg. 478
Which of the following is a disadvantage of a thermal reheat (low velocity) style central air conditioning system?
A) It isn't very efficient.
B) It doesn't provide all the basic environmental control requirements.
C) It has a very high energy consumption
C) It has a very high energy consumptions.
What is a self-contained air conditioning system known as?
A) A duplex system.
B) A combined system.
C) A central system.
D) A unitary system.
E) A modular system.
D) A unitary system.
What is the "U-factor" of a wall with a total resistance of 2.15 m2 �C/W?
A) 2.15 W/m2 �C
B) It can't be determined without knowing all the materials in the wall.
C) 0.215 W/m2 �C
D) 4.62 W/m2 �C
E) 0.465 W/m2 �C
E) 0.465 W/m2 �C
ch. 136 - pg. 541
Note:
�C can be substituted with K if temperatures are measured in K.
When there is the possibility of freezing temperatures, what type of liquid is used in a runaround type heat recovery system?
A) steam.
B) water.
C) mineral oil.
D) ethylene glycol.
E) silicone thermal fluid.
D) ethylene glycol.
Which of the following are NOT advantages for a runaround heat recovery system?
(choose all that are correct)
1. Installation costs are comparatively low.
2. The system is readily adaptable to retrofit applications.
3. Piping is not required in the system
3 & 7
What is the difference between a VAV air conditioning system and a Compartmental VAV air conditioning system?
A) Instead of one large air system, the compartmental VAV system uses a number of smaller systems.
B) In the compartmental system, the air handli
A) Instead of one large air system, the compartmental VAV system uses a number of smaller systems.
Which of the following statements is TRUE regarding unitary air conditioning systems?
A) They are built on site.
B) They supply conditioned are to multiple zones.
C) The require little or no ductwork.
D) They are modular in construction with components of
C) The require little or no ductwork.
In a heat pipe recovery system, where would face and bypass dampers be installed?
A) In the heat pipe unit itself.
B) In the exhaust duct.
C) In the ventilation duct.
D) In the ventilation or exhaust duct.
E) In the ventilation and exhaust duct.
D) In the ventilation or exhaust duct.
ch. 134 - pg. 502 *See figure 11
This type of unitary air conditioning system incorporates heating/cooling coils along with boilers and chillers.
A) Window air conditioner.
B) Packaged air conditioner.
C) Unit ventilator.
D) Rooftop unit.
E) Combined air conditioner.
C) Unit ventilator.
ch. 132 - pg. 464
What can be done to prevent preheat air conditioning coils from freezing?
(choose all that are correct)
1. OA dampers should close when the fan is off.
2. provide coil drainage.
3. Install electric de-icers.
4. Ensure hot water flow is shut off during col
1 & 2
1. OA dampers should close when the fan is off.
2. provide coil drainage.
ch. 135 - pg. 518
What would be the result of low water pressure in a water grid type humidifier?
A) Water carryover.
B) High relative humidity in the controlled space.
C) Incomplete atomization.
D) Reduced air temperature.
E) Faulty humidistat readings.
C) Incomplete atomization.
Installation of a thermal wheel requires?
A) Minimal space.
B) Pre-conditioning coils in addition to the thermal wheel itself.
C) A pump, piping and a circulating fluid.
D) The ductwork must be adjacent and parallel.
E) Louvers or deflectors to prevent ca
D) That the ducts be adjacent and parallel.
ch. 134 - pg. 494
What is the difference between "Thermal Conductance" and "Thermal Conductivity"?
A) Thermal conductance deals with a composite material; Thermal conductivity deals with a uniform type of material.
B) Thermal conductivity uses SI units; Thermal conductance
A) Thermal conductance deals with a composite material; Thermal conductivity deals with a uniform type of material.
For what type of use is the Induction type combined air conditioning system suitable for?
A) Motels.
B) Buildings with multiple zones.
C) Exterior zones of very large multi-zone buildings.
D) Private residences.
E) Office buildings.
C) Exterior zones of very large multi-zone buildings.
What type of ducting is used in a Variable Air Volume air conditioning system?
(choose all that are correct)
1. low velocity
2. medium velocity
3. high velocity
4. high velocity/high volume
1 & 2
1. low velocity
2. medium velocity
How do you calculate the Coefficient of Performance for a heat pump?
A) Net cooling effect/Gross heating value.
B) Heat output/Energy input.
C) Heat output/Heat losses.
D) Volumetric efficiency/Refrigerating effect.
E)Net cooling effect/Heat input.
B) Heat output / Energy input.
In a heat pipe, how is the capillary action enhanced?
A) Fine circumferential striations.
B) Fine capillary tubes.
C) A cotton wick.
D) Gravity
E) Surface tension.
A) Fine circumferential striations.
??????
One disadvantage of a runaround type heat recovery system is:
A) in cold weather, heat recovery is limited due to frost forming on the recovery coil.
B) the system isn't easily retrofitted into an existing system.
C) cross contamination is possible.
D) it
A) in cold weather, heat recovery is limited due to frost forming on the recovery coil.
Heat loss from a building is:
A) dependent on the shape of the openings in a building.
B) is not affected by wind speed.
C) affected by wind speed.
D) independent of outside temperature.
E)not affected by the density of the air.
C) affected by wind speed.
A packaged air conditioner may be installed horizontally or vertically on the floor or:
A) outside the room.
B) in the corridor.
C) below the floor.
D) in a central mechanical room.
E) suspended in a false ceiling.
E) suspended in a false ceiling.
What piece of equipment was developed to provide temperature control in individual rooms in buildings such as hotels?
A) A rooftop unit.
B) A window air conditioner.
C) A unit ventilator.
D) A packaged air conditioner.
E)A multi-zone unit.
C) A unit ventilator.
The runaround heat recovery system consists of two finned tube heat exchangers and a circulating system. Where is the preconditioning coil of this system located?
A) On the suction side of the pump.
B) On the discharge side of the 3-way mixing valve.
C) I
C) In the ductwork introducing the ventilation into the process.
A window air conditioner is divided into two compartments. They are:
(choose the two that are correct)
1. the expansion compartment.
2. the supply air plenum.
3. the condenser compartment.
4. the return air plenum.
2 & 3
What functions do the mixing boxes in a dual duct air conditioning system perform?
(choose all that are correct)
1. humidification.
2. blending air temperatures.
3. maintain constant air flow.
4. filtration.
2 & 3
What is the purpose of a "gradual switch" when installed in an air damper control circuit?
A) It allows the damper to open gradually rather than instantly.
B) It initiates the opening of the damper.
C) It allows manual repositioning of the damper.
D) It w
C) It allows manual repositioning of the damper.
In an air conditioning system that uses static pressure regulation to control volume flow, what happens when the differential pressure controller senses a rise in duct pressure?
A) The zone temperature rises.
B) Velocities in the duct decrease.
C) The zon
D) The static pressure damper is throttled.
When considering the operating costs, as part of the decision making process for selecting an air condition system, which of the following are factors?
(choose all that are correct)
1. operating efficiency.
2. payback.
3. purchase price.
4. energy consump
1, 2, 3, 4
ch. 133 - pg. 484
How do combined air conditioning systems improve operational efficiency?
A) They can use a lower grade of fuel.
B) They are more flexible for energy saving measures.
C) Individual rooms can be isolated to repairs without shutting down the entire system.
D
B) They are more flexible for energy saving measures.
ch. 133 - pg. 475
If exhaust fans are not used over cooking, only _________% of the heat gain is used in calculations.
A) 10%
B) 25%
C) 50%
D) 60%
E) 75%
C) 50%
ch. 136 - pg. 545
In a commercial office building which requires a mix of outside air and return air, what usually is the minimum amount of outside air that must be provided?
A) 0%
B) 5%
C) 10%
D) 15%
E) 20%
D) 15%
ch. 135 - pg. 513
An air handling unit may run on:
(choose all that are correct)
1. 100% outside air.
2. 100% recirculated air.
3. A fixed percentage of outside air.
4. Mixed air, a varying percentage of outside air and recirculated air.
1, 2, 3, 4
Disadvantages of a thermal wheel heat recovery include:
(choose all that are correct)
1. a large space is required.
2. perfect sealing is impossible.
3. the ducts must be side-by-side.
4. the recovery rate is relative low.
1, 2 & 3
Conduction heat gain is based on the assumption that the outer surface temperature is the same as the outdoor temperature. This does not take into account:
A) the sun's rays which fall on the surface.
B) the surface are of the roof.
C) the surface area of
A) the sun's rays which fall on the surface.
What does it mean when it is said that the air temperature in an air conditioning system has been "tempered"?
A) The temperature has been raised.
B) The temperature has been lowered.
C) The temperature has been adjusted to within the required range by the
C) The temperature has been adjusted to within the required range by the addition of heating or cooling.
Referring to heat flow, what is the "U-factor"?
A) It is the sum of all heat gains.
B) It is the net result of heat gains minus heat losses.
C) It is the overall coefficient of heat transmission.
D) It is the universal heat transmission constant.
E)It is
C) It is the overall coefficient of heat transmission.
How can carry-over in a thermal wheel heat recovery system be minimized?
A) By installing a purge section.
B) Slowing down the rotational speed of the wheel.
C) Moving the supply and exhaust ducts farther apart.
D) Install section filters.
E) Eliminated l
A) by installing a purge section.
ch. 134 - pg. 496
What is the Coefficient of Performance of a heat pump which uses 4 kW of energy to produce 10 kW of heating capacity?
A) 40
B) 0.4
C) 5 kW
D) 2.5
E) 0.4 kW
D) 2.5