WorksheetsAir Distribution Systems
Total questions: 25
Worksheet time: 13mins
Which of the following is not a type of air distribution system?
a) Gravity system
b) Forced-air system
c) Radiant system
d) Conduction system
What is the purpose of an air distribution system in HVAC?
a) To distribute fresh air throughout the building
b) To circulate warm air in the summer
c) To distribute conditioned air evenly throughout the building
d) To remove excess humidity from the building
Which component is responsible for moving air through the ductwork?
a) Diffuser
b) Grille
c) Air handler
d) Damper
What is the most common material used for residential ductwork?
a) Fiberglass
b) Steel
c) PVC
d) Aluminum
Which of the following statements about air filters is true?
a) Air filters should be replaced annually.
b) Air filters only need to be cleaned if they are visibly dirty.
c) Air filters should be replaced regularly to maintain system efficiency.
d) Air filters are not necessary in air distribution systems.
Which of the following is a characteristic of a properly designed duct system?
a) Uneven airflow distribution
b) Excessive noise from the air vents
c) Properly sized and sealed ducts
d) High static pressure in the ducts
What is the purpose of a duct damper?
a) To control the temperature of the air
b) To prevent air leakage from the ducts
c) To control the airflow direction
d) To increase the system efficiency
Which of the following is an example of a supply air outlet?
a) Return grille
b) Air register
c) Venturi nozzle
d) Mixing box
What is the purpose of a diffuser in an air distribution system?
a) To mix outside air with return air
b) To remove airborne contaminants from the air
c) To distribute air into the conditioned space
d) To measure the velocity of the air
Which component is responsible for removing stale air from the building?
a) Return grille
b) Air register
c) Venturi nozzle
d) Mixing box
What is the recommended minimum clearance for ductwork in attics and crawl spaces?
a) 2 inches
b) 4 inches
c) 6 inches
d) 8 inches
Which of the following is a common type of flexible duct?
a) Spiral duct
b) Rectangular duct
c) Insulated duct
d) Round duct
What is the purpose of insulation on ductwork?
a) To prevent condensation on the ducts
b) To reduce airflow resistance
c) To increase the strength of the ducts
d) To control the air temperature
Which type of damper is used to regulate airflow in a duct?
a) Manual damper
b) Fire damper
c) Balancing damper
d) Volume damper
Which of the following is not a factor that affects the selection of duct material?
a) System capacity
b) Airflow velocity
c) Noise level
d) Occupancy type
What is the purpose of a plenum in an air distribution system?
a) To distribute air to the occupied space
b) To connect the air handler to the ductwork
c) To provide a space for duct expansion and contraction
d) To increase the system efficiency
What is the recommended maximum velocity for air in a duct system?
a) 500 feet per minute
b) 800 feet per minute
c) 1,000 feet per minute
d) 1,500 feet per minute
Which type of grille is commonly used for ceiling applications?
a) Return grille
b) Floor grille
c) Wall grille
d) Ceiling grille
What is the purpose of a turning vane in a duct system?
a) To control the airflow direction
b) To reduce the noise level
c) To increase the airflow velocity
d) To remove airborne contaminants from the air
Which of the following is an example of a supply air terminal unit?
a) Diffuser
b) Air register
c) Venturi nozzle
d) Mixing box
What is the purpose of a sound attenuator in an air distribution system?
a) To increase the system efficiency
b) To control the airflow velocity
c) To reduce the noise level
d) To measure the airflow rate
Which of the following statements about the velocity pressure in a duct system is true?
a) Velocity pressure is the pressure exerted by the air on the duct walls.
b) Velocity pressure is directly proportional to the airflow velocity.
c) Velocity pressure is independent of the duct size.
d) Velocity pressure is only present in supply ducts.
Which component is responsible for controlling the temperature of the supply air?
a) Diffuser
b) Grille
c) Air handler
d) Damper
What is the purpose of a turning vane in a duct system?
a) To control the airflow direction
b) To reduce the noise level
c) To increase the airflow velocity
d) To remove airborne contaminants from the air
What is the purpose of a diffuser in an air distribution system?
a) To mix outside air with return air
b) To remove airborne contaminants from the air
c) To distribute air into the conditioned space
d) To measure the velocity of the air
