True
Caution must be used with changing from one filter type to another. If a technician installs a high density filter in this application, it is very likely that the air flow will be reduced because the same filter area is used with a more dense filter.
600 cfm
Using a Duct size calculator, Calculate the CFM's of air quantity at .05 w.c. static pressure for 10x15" square metal duct?
True
The greater the resistance the slower the rate of heat transfer?
air cleanliness, air movement, temperature, and humidity Correct
Comfort can be described as the gentle balance between
3600 cfm
Using a Duct size calculator, Calculate the CFM's of air quantity at .05 w.c. static pressure for 20x30" square metal duct?
False
The smaller the conductivity the fast heat transfer can occur.
sensible heat level of the air
The dry-bulb temperature is the
True
Forced air systems deliver the correct quantity of conditioned air to the occupied space
False
The rate of heat transfer through a given material is indirectly proportional the temperature differential.
True
Duct systems can be made of galvanized metal, aluminum, fiberglass duct board, spiral metal, flexible duct or a combination of different materials.
around doors and windows
Infiltration is the term used when referring to the air entering a structure
True
Typically, 400 cfm of air must be moved per minute per ton of air conditioning
False
Introduction of forced ventilation in the winter heating season helps to raise the humidity level.
160 cfm
Using a Duct size calculator, Calculate the CFM's of air quantity at .05 w.c. static pressure for 8" round metal duct?
5200 cfm
Using a Duct size calculator, Calculate the CFM's of air quantity at .05 w.c. static pressure for 30" round metal duct?
True
Pressure in the ductwork is measured in inches of water column (in. W.C)
False
Infiltration losses does not have to be considered when performing a heating load estimate
50 cfm
Using a Duct size calculator, Calculate the CFM's of air quantity at .05 w.c. static pressure for 4x5" square metal duct?
True
The human body is comfortable when the heat produced in the body is equal to the heat lost to the surroundings.
700 cfm
Using a Duct size calculator, Calculate the CFM's of air quantity at .05 w.c. static pressure for 14" round metal duct?
True
The friction chart is used to properly size duct systems
True
The main purpose of adding a humidifier to a heating system is to replace the moisture that is removed by the heating equipment.
a. ionizing sections
b. charcoal filters
c. pre-filters Incorrect
(d. all of the above)
Electronic air cleaners generally have
70
A high density fiberglass filter media air filter will catch and retain ____% of the particles in the air.
charcoal
One of the most common substances that is used as an absorber is ____.
A. does not clog up as quickly as a standard filter
b. is able to remove more dirt since the surface area is larger
d. both a and b Correct
An extended surface filter (pleated type) ____.
a. locating and eliminating the source of contamination Incorrect
b. providing adequate ventilation
c. providing methods for cleaning the air
(d. all of the above)
The steps to aggressively controlling the contamination of indoor air would involve ____.
a. fungi
b. bacteria
c. algae
(d. all of the above Correct)
If reservoir-type humidifiers are not properly maintained, which of the following can be discharged into the air?
True
The greater the resistance the slower the rate of heat transfer
True
It is only necessary to calculate heat flow through the surfaces that constitute this building envelope.
oxygen starved and stagnant
A fresh air intake is necessary to keep the indoor air from becoming ____.
False
People who are active and spend a great deal of time outdoors are more likely to experience the effects of pollution.
True
The controller for a humidifier, a humidistat, has a power element that is ____ sensitive.
True
The greater the temperature differential the quicker the heat is transferred.
any position would work
A high density fiberglass filter media air filter should be installed on the ________ side of the duct work.
evaporate
Humidification generally relates to the process of causing water to ____ into the air.
False
Infiltration losses does not have to be considered when performing a heating load estimate.
tiny water droplets
Atomizing humidifiers discharge ____ into the air.
True
The air conditioning system is responsible for controlling the humidity inside a structure.
True
PPE should be used if ther are chemicals or excessive heat in the work enviromen
True
When hanging a horizontal air handler, it should be pitched toward the drain port for proper condensate removal.
True
Not changing air filters can often cost more than the price of the filters.
True
A necessary safety practice for a technician is to keep a padlock with only one key in the tool box.
a. each room can be controlled individually
b. they are inexpensive to install
(d. both a and b Correct)
The benefits of electric baseboard heating are that ____.
a. in an attic
b. in a drop ceiling
c. above a traffic area
(d. all of the above Correct)
An auxiliary drain pan under an air handler is required when the air handler is installed ____.
True
Generally speaking, electric heat is very efficient but costs more when compared to oil and gas.
True
Safety shoes are just one type of PPE that a person working on a job site should consider?
True
Electric furnaces are 100% efficient?
True
The proper type of PPE should be used because of the differences in the types of hazards on a job site?
False
Aluminum ladders are safe to use around electrical equipment as long as they have insulation pads on the bottom of the rungs.
True
One potential safety hazard that all technicians should be aware of when working on an electric furnace is that there are many exposed electrical connections.
12000
One ton of cooling is equal to ______________ BTU/hr
True
Sensible heat is a change in temperature without a change in state.
heat that changes state without a change in temperature.
What is latent heat?
True
The formula for finding the total BTU needed is: weight x Delta T x Specific Heat.
c. 14.7 psia
What is atmosheric pressure at sea level?
Btu
The common unit of heat energy is the?