Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| show | 8 to 14 fins per inch
🗑
|
||||
| show | 4-14 fins per inch
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|
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| show | 3 to 8 fins per inch
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|
||||
| In air conditioning systems coils with rippled fins and a staggered tube pattern | show 🗑
|
||||
| show | Spiral finned and continuous plate finned
🗑
|
||||
| show | A lower heat transfer rate
Better protection against freezing
Increased friction losses in the coil and piping
A requirement for a larger pump with more horsepower
🗑
|
||||
| What are four true statements about vacuum breakers | show 🗑
|
||||
| Where must a vacuum breaker be installed in relation to the control valve | show 🗑
|
||||
| Short steam coils are not likely to freeze providing | show 🗑
|
||||
| show | Supply air velocity
Size of supply air duct
Increased fan size
🗑
|
||||
| By keeping the supply air temperature for a low velocity terminal reheat system at 12.5 c year round this system is | show 🗑
|
||||
| In a combined air conditioning system the conditioned air supplied from the mechanical room normally provides | show 🗑
|
||||
| show | Which of the basic requirements must be provided
Which requirements are desirable but not essential
🗑
|
||||
| In a central air conditioning system where are the thermostats located | show 🗑
|
||||
| In a fan coil unit with makeup air system the supply air from the central AHU to the fan coils in each room is delivered by | show 🗑
|
||||
| show | Regulates the water control valve on the fan coil
🗑
|
||||
| Fan coils with a makeup air system utilize a central system to provide | show 🗑
|
||||
| show | 12.5 c
🗑
|
||||
| show | Water to water type using a well as the heat source
🗑
|
||||
| The term coefficient of performance is used for rating | show 🗑
|
||||
| By tilting the evaporator section of a heat pipe recovery unit below the horizontal the heat recovery rate of the system will be | show 🗑
|
||||
| The heat recovery rate of a thermal wheel can be improved by | show 🗑
|
||||
| show | To cycle the compressor on and off
🗑
|
||||
| To manually reposition an air conditioning systems outside air damper the device that must be installed is | show 🗑
|
||||
| Freestanding portable units used for home humidification normally have a delivery rate of | show 🗑
|
||||
| show | Has a greater time lag in responding to a change
Uses an on off or a modulating control valve
Is generally used on smaller systems with lower demand
🗑
|
||||
| The provisions that must be followed to obtain proper performance of a hot water heating coil include | show 🗑
|
||||
| For normal heating applications the required number of rows for a hot water coil seldom exceeds | show 🗑
|
||||
| One of the methods used to provide uniform steam distribution to the individual tubes of a steam coil is | show 🗑
|
||||
| When a preheat coil is employed in an air conditioning system to prevent overheating the space temperature the mixing air temperature is limited to | show 🗑
|
||||
| The preferred steam trap for insulation on air conditioning heating coils operating at higher pressures ( in excess of 172 kPa) is the | show 🗑
|
||||
| Steam coils with long tubes are more likely to freeze when the outside air temperature is | show 🗑
|
||||
| show | 3.55 m/s
🗑
|
||||
| show | Central system
🗑
|
||||
| show | Window air conditioner
🗑
|
||||
| show | Multi zone system
🗑
|
||||
| The application of an air conditioning system depends on | show 🗑
|
||||
| What are four things that a forced air system used in a residential house does | show 🗑
|
||||
| Fan coil unit in a hotel or motel room provide the room with | show 🗑
|
||||
| In a constant air volume system with perimeter heating the set supply air temperature may result in over cooling in rooms if | show 🗑
|
||||
| show | The way the air in the room is circulated
🗑
|
||||
| show | Operating flexibility allowing each floor to be operated independently
🗑
|
||||
| show | A reversing valve must be installed
A second expansion valve must be installed
Two check valves must be mounted in parallel to the expansion valve
🗑
|
||||
| Coefficient of performance is defined as a units | show 🗑
|
||||
| show | Recovery coils
🗑
|
||||
| show | Preheat system with face and bypass dampers
🗑
|
||||
| show | Opposite each other
🗑
|
||||
| show | Primary
Secondary
🗑
|
||||
| What are three methods used to ensure uniform distribution of steam within the tubes of steam heated coils | show 🗑
|
||||
| Why is it more likely for outside air heating coils to freeze up when the outside air is slightly below freezing than when it is like -20 | show 🗑
|
||||
| show | Ones small enough so that at least 40 percent is used
🗑
|
||||
| Why does the minimum steam supply pressure before the control valve should be 68 kPa or greater | show 🗑
|
||||
| show | Constant stream of water to the coil
Air velocity through the coil should not exceed 3.55 m/s
Positive air venting of the coil is essential
Control system must be selected to warn if
Circulating pump fails or heat source fails
🗑
|
||||
| show | It is a safety control which will stop the fan and close the outside dampers in the event that the t4 should malfunction
🗑
|
||||
| show | Or sail switch it is another safety control. It will stop the fan and close the outside dampers if the flow of water is interrupted due to pump failure or the failure of hand valves
🗑
|
||||
| show | Because the heat transfer surface shouldn’t exceed 140 c if it does it will cause a breakdown of the inhibitors
🗑
|
||||
| show | Through a heat exchanger using steam as the main source of heat also called a steam glycol converter
🗑
|
||||
| show | Tubes must be in a vertical position to ensure condensate drainage
When not in a vertical position coils must be sufficiently pitched to allow proper condensate drainage
Make sure that the coils are completely stainable when system is switched off
🗑
|
||||
| What are six recommendations for piping handling systems | show 🗑
|
||||
| What is the proper pitch for steam condensate return lines? | show 🗑
|
||||
| show | Selection based on pressure difference across trap minimum capacity = to 3 x coil condensation rate
Location 12 inch below coil return
Trap each coil separately
Float and thermostat F and T preferred
Inverted bucket trap pressure 172 kPa +
🗑
|
||||
| show | Overhead returns require 7 kPa of available pressure at the trap discharge
Install strainer near inlet of each trap
Use same pipe size for drip leg as the rest of the system
🗑
|
||||
| A single control valve Blank Blank Blank Blank Blank Blank Blank Blank connected in parallel since each coil has equal loading and pressure drop | show 🗑
|
||||
| List the seven functions of a building air conditioning system | show 🗑
|
||||
| List the three basic different air conditioning systems | show 🗑
|
||||
| Define “free cooling” | show 🗑
|
||||
| How is temperature control of window air conditioner is achieved | show 🗑
|
||||
| How does a slinger ring operate in a window air conditioner | show 🗑
|
||||
| show | Packaged mounted on the floor
Connected with duct work
Can handle much larger areas
Humidification provided
Are quieter
🗑
|
||||
| show | 3-75 tinned
Packaged 2.7 to 13.6
🗑
|
||||
| show | The air handling unit is located in a mechanical room within the building
🗑
|
||||
| How does a terminal reheat low velocity air conditioning system | show 🗑
|
||||
| show | Very high energy consumption
Is designed for a maximum cooling load
🗑
|
||||
| show | From 2-12 zone mixing dampers are located at the discharge of the unit
Each pair is connected by a separate duct to each zone
A space thermostat in the zone acts to adjust the mix of hot and cold air
Dampers are linked so full opening of the cold
🗑
|
||||
| show | Constant volume system with perimeter heating
Fan coil system
Hydronic heat pump system
Variable air volume w perimeter heating system
Compartmental variable air volume system
🗑
|
||||
| What is unique about the constant volume system with perimeter heating | show 🗑
|
||||
| What are constant volume system with perimeter heating used primarily for? | show 🗑
|
||||
| show | Not well suited for larger buildings due to the space requirement
🗑
|
||||
| show | Located in the exterior wall or in the ceiling
100 percent outdoor system
Temperature is controlled by a wall thermostat
Boilers and chillers located in the boiler room
2 pipe arrangement return and supply
🗑
|
||||
| What is special about a hydronic heat pump system | show 🗑
|
||||
| What are the advantages of the hydronic heat pump system | show 🗑
|
||||
| show | High electrical consumption
Stop start compressor may result in temperature swings
Compressor noise
🗑
|
||||
| What is so special about the variable air volume with perimeter heating system | show 🗑
|
||||
| What are the good and bad things about variable air volume | show 🗑
|
||||
| What is so great about compartmental air volume system | show 🗑
|
||||
| show | Occupancy is only one floor
If one component breaks down the entire system is shutdown
Units are not capable of free cooling
🗑
|
||||
| Describe the run around system used for heat recovery in air conditioning systems | show 🗑
|
||||
| show | Coils are limited to 6-8 rows
Install a three way mixing valve
When temperature reaches-3 some the warm liquid will be diverted back to the recovery coil
🗑
|
||||
| What are the advantages of a run around system | show 🗑
|
||||
| What is the disadvantage of a run around system | show 🗑
|
||||
| What is a heat recovery wheel | show 🗑
|
||||
| What sort of heat transfer material does thermal wheels use | show 🗑
|
||||
| Advantages of thermal wheels | show 🗑
|
||||
| Disadvantages of the thermal wheel | show 🗑
|
||||
| In a thermal wheel direction of the exchange depends on the blank | show 🗑
|
||||
| show | Two air streams must work in opposite directions
🗑
|
||||
| show | It is a tube with a capillary wick consisting of fine circumferential striation machined into its surface
Tube is permanently sealed at both ends and filled with refrigerant
🗑
|
||||
| show | Warm air flows over one end of the pipe transferring the heat and causing the refrigerant to vapourized
Vapour flows back to the cold end of the pipe and condenses
The condensed liquid is entrained by the capillary action of the wick
🗑
|
||||
| What are three types of how to apply heat recovery processes | show 🗑
|
||||
| show | Piping and pumps not required
No continuously moving parts
Recovery is practical for a wide range of temperature from -50 to 700
No cross contamination
No external power needed
Wide variety of sizes that makes them adaptable to many spaces
🗑
|
||||
| Disadvantages of the heat pipe recovery system | show 🗑
|
||||
| What is the main advantage of using a heat pump over a more conventional air conditioning system | show 🗑
|
||||
| What are the disadvantages of using a heat pump over a conventional heater | show 🗑
|
||||
| show | Water to air
Water to water
Earth to air
🗑
|
||||
| What are 5 methods of regulating air heating in heating an air conditioning system | show 🗑
|
||||
| show | The purpose is to control the static pressure in a system
It measures the pressure in the supply duct in response this control modulates the damper on the fan
🗑
|
||||
| show | Distribute steam evenly over the entire coil
🗑
|
||||
| show | Secondary surface area
🗑
|
||||
| Flat finned surface type coils are normally used for | show 🗑
|
||||
| show | Increase the heat transfer efficiency by creating more turbulence at fin surfaces
🗑
|
||||
| show | Supply water connection should be at the bottom of the coil
🗑
|
||||
| The face velocity of a heating or cooling coil is the | show 🗑
|
||||
| show | The water supply connection is on the same side as the air leaving the coil
🗑
|
||||
| What is a limiting factor for the fin spacing of a HVAC coil | show 🗑
|
||||
| What are four true statements about water filled heating or cooling coils | show 🗑
|
||||
| show | Extended surface coils
🗑
|
||||
| show | A good bond must exist between the tube and fin
🗑
|
||||
| What are four true statements about coil surfaces | show 🗑
|
||||
| What are four causes of freezing in hot water coils | show 🗑
|
||||
| What are four true statements about vacuum breakers | show 🗑
|
||||
| show | Are less likely to freeze if the steam trap is properly chosen and the coil is properly piped
🗑
|
||||
| show | Flanges,manual shutoff valves must provided facilitaremoval of heat exchanger coil
Temperature controller opens hot water supply valve when temperature outside10 c
Hot water flow switch prevents glycol pump starting until water supply valve established
🗑
|
||||
| Ethylene glycol used in glycol coils | show 🗑
|
||||
| In steam coils with long tube lengths and heating large amounts of low temperature outside air freezing problems are minimized by using | show 🗑
|
||||
| show | Are not recommended for use in heating and air conditioning systems in the food industry
🗑
|
||||
| show | Provisions are made to stop the fan and close the outside air dampers
🗑
|
||||
| show | Handle more types of fluids than hot water and glycol coils
🗑
|
||||
| show | Install a strainer near the inlet of each trap
Drip the steam supply main through a steam trap into the condensate main
Each steam coil requires its own dedicated steam trap
Choose a steam trap based on the pressure differential across the trap
🗑
|
||||
| show | The parallel flow arrangement because it gives better protection against freezing
🗑
|
||||
| Which steam trap is preferred to use with steam coils operating at low and medium steam pressure | show 🗑
|
||||
| The inverted bucket steam trap as applied to steam heating coils is used when the coil steam pressure is | show 🗑
|
||||
| show | At least 40 percent of the coil capacity is needed when the air temperature entering the coil is -1 c
🗑
|
||||
| With respect to heating coils air vents are not required when at the steam coil | show 🗑
|
||||
| When air handling units use hot water heating coils energy can be saved by | show 🗑
|
||||
| show | Dual duct system
🗑
|
||||
| show | Roof top unit
🗑
|
||||
| The terminal reheat air handling system has very high energy consumption because | show 🗑
|
||||
| The provision of outside air into a building does these four things | show 🗑
|
||||
| show | major equipment central systems located in a central mechanical room
Air is conditioned in main mechanical room and distributed by duct work
The central system is able to utilize large central equipment with high efficiency
Used in large buildings
🗑
|
||||
| show | Used in areas with limited floor space
Ind room temperature control
Provides heating or cooling
Room air mixed with outside air
🗑
|
||||
| show | Offset the buildings heat losses
🗑
|
||||
| Free cooling in regard to the HVAC system operation refers to | show 🗑
|
||||
| What are four characteristics of a dual duct system | show 🗑
|
||||
| Locating HVAC equipment in mechanical rooms is preferred | show 🗑
|
||||
| show | A fan coil unit with makeup air system
🗑
|
||||
| What are four statements for induction HVAC system | show 🗑
|
||||
| What are four true statements about hydronic heat pump HVAC systems | show 🗑
|
||||
| show | The arrangement is the least costly
Piping is connected to the boiler during winter and chiller during summer
The arrangement is made up of a supply and return connection to a single coil
🗑
|
||||
| Four advantages of a combined HVAC system over a central air system | show 🗑
|
||||
| show | Normal occupancy periods
🗑
|
||||
| What are four true statements about variable air volume system with perimeter heating | show 🗑
|
||||
| What are four true statements about fan coil units with make-up air systems | show 🗑
|
||||
| An HVAC system that uses high pressure induction system utilizes. Blank blank blank to provide room air circulation | show 🗑
|
||||
| show | The fan noise is excessive
🗑
|
||||
| An HVAC system that provides cooling and heating all year round is highly efficient but has a high initial cost. The system consists of two separate supply and return piping systems that are connected to separate coils | show 🗑
|
||||
| The run around coil heat recovery system uses a. Blank coil in the inlet air duct and a blank coil in the exhaust air duct | show 🗑
|
||||
| What is the disadvantage of heat pipe heat recovery systems? | show 🗑
|
||||
| show | In the duct work handling outside air
🗑
|
||||
| The recovery system which makes use of an underground heat exchange coil is called a | show 🗑
|
||||
| When is the capacity of a heat pipe at a maximum | show 🗑
|
||||
| show | Heat pump
🗑
|
||||
| show | Supply
🗑
|
||||
| show | Gradual switch
🗑
|
||||
| show | So the damper will open when the fan starts
🗑
|
||||
| In an HVAC system a differential pressure controller maintains supply air duct static pressure constant by | show 🗑
|
||||
| show | Minimum outside air required for ventilation during times of maximum return air circulation
🗑
|
||||
| show | Closes the bypass damper and opens the face damper to direct air through the coil
🗑
|
||||
| show | Run the compressor continuously and unload it when the temperature set point is reached
🗑
|
||||
| When the outdoor air damper of an HVAC system opens to increase the flow of fresh air the return damper | show 🗑
|
||||
| show | Ventilation
🗑
|
||||
| In refrigeration systems the most common methods used to control the capacity of a reciprocating compressor are | show 🗑
|
||||
| The temperature in the evaporator depends | show 🗑
|
||||
| What are four things that a economizer of a packaged water chiller does | show 🗑
|
||||
| The refrigeration compressors operating control that uses a bimetal element is a | show 🗑
|
||||
| The liquid line shutoff valve of a refrigerant system is | show 🗑
|
||||
| The safety control of a centrifugal compressor that ensures the compressor only starts under a no load condition is called the | show 🗑
|
||||
| show | Operate the oil pump for at least 10 minutes before starting the compressor
Open the stop valves in the chilled water system
Open the makeup water valve
Check the refrigerant levels
🗑
|
||||
| The funds allocated for the selection of a buildings HVAC system would be found in the Blank Blank portion of the construction budget | show 🗑
|
||||
| show | Compressor will start
🗑
|
||||
| show | About one half hour after the absorption unit is started
🗑
|
||||
| In a refrigeration system what are four causes of poor condenser performance | show 🗑
|
||||
| show | Automatic expansion valve
🗑
|
||||
| What is a true statement about flow switches | show 🗑
|
||||
| What are four components of mechanical purging systems for lithium bromide chiller | show 🗑
|
||||
| show | Fungi
🗑
|
||||
| show | Are often used on mixing boxes for both outside and recirculated air
🗑
|
||||
| What are four common types of refrigeration condensers | show 🗑
|
||||
| Evaporator bypass dampers require. Blank to move | show 🗑
|
||||
| show | To increase the absorbency potential of used absorbent
🗑
|
||||
| In a refrigeration system controlled by a high pressure float valve excessive refrigerant charge will cause | show 🗑
|
||||
| show | Raises pressure of refrigerant
Raises temperature of the refrigerant
Maintains a low pressure in the evaporator
Circulates refrigerant through the system
🗑
|
||||
| show | Evaporator pressure against a return spring
🗑
|
||||
| Multi zone air handling system when the hot deck is fully closed | show 🗑
|
||||
| Backwards inclined airfoil fans | show 🗑
|
||||
| show | Boil liquid refrigerant at low pressure low temperature
🗑
|
||||
| show | Dissolved oxygen
🗑
|
||||
| With regard to fan capacity control which of the following has a declutching feature | show 🗑
|
||||
| show | The systems auxiliary equipment is not electronically interlocked
🗑
|
||||
| What are four true statements about lithium bromide absorption refrigeration systems | show 🗑
|
||||
| show | maintains constant pressure in evaporator during compressor operation regardless of load
A spring exerting downward force on diaphragm opens it
spring force is counter acted by evaporator pressure
When compressor stops valve automatically shuts off
🗑
|
||||
| The vane axial flow fan | show 🗑
|
||||
| What is not likely to be found in a typical constant air volume system when combined with perimeter heat | show 🗑
|
||||
| show | Slightly above atmospheric pressure
🗑
|
||||
| show | Hydronic heat pump
🗑
|
||||
| show | Annually
🗑
|
||||
| With all other factors being equal a counterflow cooling tower. Blank as a cross flow cooling tower | show 🗑
|
||||
| The chilled water flow switch prevents the | show 🗑
|
||||
| Calculations of supply air duct leakage loss include | show 🗑
|
||||
| During summer the effective temperature is | show 🗑
|
||||
| In the lithium bromide refrigeration system what is the function of the concentrator | show 🗑
|
||||
| show | Starving of the evaporator and reduced cooling capacity
🗑
|
||||
| What are four true statements about shell and tube refrigeration evaporator | show 🗑
|
||||
| A compressor system can be divided into two parts A high pressure section carrying the head pressure and a low pressure section carrying the | show 🗑
|
||||
| In an ammonia absorption refrigeration system the. Blank ammonia is absorbed by the. Blank aqua | show 🗑
|
||||
| show | 7.6 m
🗑
|
||||
| Raising the condescending point of the refrigerant vapour above the temperature of the cooling medium is the function of the | show 🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
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To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
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