Ductwork Design and Installation: Online Learning Quizzes

Question 1

When sizing ducts for a residential home, which method considers factors such as pressure drop and airflow rates?

Accepted Answer

Pressure drop method

Answer

Rule of thumb

Answer

Velocity method

Answer

Static regain method

Question 2

What is the primary function of a plenum in a ductwork system?

Accepted Answer

Distribute air evenly to multiple branches

Answer

Reduce noise levels

Answer

Increase airflow velocity

Answer

Filter out dust and particles

Question 3

Which type of duct seal is primarily used to connect sheet metal ductwork and ensure airtight joints?

Accepted Answer

Mastic

Answer

Duct tape

Answer

Caulk

Answer

Screws

Question 4

What is the primary purpose of using a ductulator in ductwork design?

Accepted Answer

Calculate duct size and pressure drop

Answer

Measure airflow velocity

Answer

Detect leaks in ductwork

Answer

Clean ducts

Question 5

Which factor does NOT directly influence the pressure drop in a duct system?

Accepted Answer

Temperature of the air

Answer

Duct size

Answer

Duct length

Answer

Number of bends

Question 6

What is the recommended minimum slope for a horizontal duct that drains condensate to prevent water buildup?

Accepted Answer

1/8 inch per foot

Answer

1/4 inch per foot

Answer

1/2 inch per foot

Answer

1 inch per foot

Question 7

Which tool is commonly used to accurately measure the airflow rate in a duct?

Accepted Answer

Anemometer

Answer

Manometer

Answer

Thermometer

Answer

Barometer

Question 8

What is the main purpose of a bypass damper in a ductwork system?

Accepted Answer

Control airflow distribution to different areas

Answer

Prevent backdrafting

Answer

Reduce noise

Answer

Improve air quality

Question 9

Which of the following is the primary determinant of the appropriate size of a duct system?

Accepted Answer

Airflow rate required by the space

Answer

Length of the longest duct run

Answer

Type of insulation used in the ducts

Answer

Static pressure in the system

Question 10

What is the primary function of a plenum in a ductwork system?

Accepted Answer

Distribute air evenly throughout the system

Answer

Reduce noise levels in the ductwork

Answer

Increase airflow velocity through the ducts

Answer

Prevent condensation from forming in the ducts

Question 11

Which type of duct material is most commonly used in residential HVAC systems?

Accepted Answer

Galvanized steel

Answer

Flexible duct

Answer

Rigid fiberglass duct

Answer

Flexible fiberglass duct

Question 12

What is the primary purpose of using sealant tape in ductwork installation?

Accepted Answer

Prevent air leaks in the ductwork

Answer

Reinforce duct joints

Answer

Reduce condensation on the ducts

Answer

Improve the insulation value of the ducts

Question 13

What is the primary function of a balancing damper in a ductwork system?

Accepted Answer

Adjust airflow rates to different areas of the building

Answer

Prevent backdraft from occurring in the ductwork

Answer

Reduce pressure drop in the ductwork

Answer

Improve indoor air quality

Question 14

What is the primary reason for installing a return air duct in a heating system?

Accepted Answer

Circulate air throughout the conditioned space

Answer

Provide fresh outdoor air to the system

Answer

Prevent excessive static pressure in the ductwork

Answer

Remove pollutants from the air in the space

Question 15

For large commercial buildings with multiple zones, which duct layout configuration provides the most precise control over airflow to each zone?

Accepted Answer

Trunk-and-branch

Answer

Radial

Answer

Perimeter loop

Answer

Underfloor

Question 16

What is the primary purpose of applying duct sealant during ductwork installation?

Accepted Answer

Prevent air leakage

Answer

Enhance air circulation

Answer

Mitigate noise

Answer

Increase ductwork rigidity

Question 17

Identify the material commonly used for flexible ductwork due to its ability to navigate confined spaces.

Accepted Answer

Polypropylene

Answer

Galvanized steel

Answer

Fiberglass

Answer

Aluminum

Question 18

To ensure airtight connections and minimize energy loss, what is the proper sealing technique for ductwork?

Accepted Answer

Apply mastic sealant to all duct joints and seams, reinforcing with aluminum tape for added strength.

Answer

Use duct tape exclusively to seal all duct joints.

Answer

Rely on the system pressure to maintain airtight connections without additional sealing.

Answer

Fill any gaps or leaks in the ductwork with spray foam insulation.

Question 19

To analyze a ductwork system, what comprehensive approach should you take to determine airflow rates and calculate pressure drops?

Accepted Answer

Employ the Darcy-Weisbach equation and fan performance curves for precise airflow rate and pressure drop calculations.

Answer

Rely solely on duct sizing charts to estimate airflow rates, disregarding system-specific factors.

Answer

Assume uniform airflow and ignore friction losses, leading to simplified but inaccurate calculations.

Question 20

What is the primary purpose of a take-off in ductwork?

Accepted Answer

To connect a branch line to a main duct

Answer

To increase airflow velocity in a duct

Answer

To reduce static pressure in a duct

Answer

To change the direction of airflow in a duct

Question 21

Which of the following ductwork materials exhibits high durability and resistance to corrosion?

Accepted Answer

Galvanized Steel

Answer

Fiberglass

Answer

Polyvinyl Chloride (PVC)

Answer

Flexible Ducting

Question 22

Which instrument is utilized to measure static pressure within a duct system?

Accepted Answer

Manometer

Answer

Thermometer

Answer

Anemometer

Answer

Tachometer

Question 23

As per safety regulations, what is the minimum clearance recommended between a duct and a combustible surface?

Accepted Answer

2 inches

Answer

1 inch

Answer

3 inches

Answer

4 inches

Question 24

When selecting the optimal duct size for an HVAC system, which factors are crucial to consider?

Accepted Answer

Airflow rates, friction losses, and noise levels

Answer

Airflow rates and friction losses only

Answer

Friction losses and noise levels only

Answer

Noise levels only

Question 25

What is the primary purpose of a duct liner?

Accepted Answer

To reduce noise and improve airflow efficiency

Answer

To prevent corrosion

Answer

To support the ductwork structure

Answer

To provide thermal insulation

Question 26

Which of the following is NOT a common cause of duct leakage?

Accepted Answer

Tightly sealed joints

Answer

Damaged ductwork

Answer

Loose fittings

Answer

Unsealed penetrations

Question 27

What is the primary purpose of a static pressure test?

Accepted Answer

To measure the pressure drop within the ductwork system

Answer

To detect air leaks

Answer

To determine the airflow rate

Answer

To evaluate the efficiency of the air handler

Question 28

Which device is commonly used to measure the airflow rate in a duct?

Accepted Answer

Anemometer

Answer

Micromanometer

Answer

Manometer

Answer

Pressure gauge

Question 29

What is a key benefit of using flexible ductwork?

Accepted Answer

Simplified installation process

Answer

Reduced noise generation

Answer

Improved airflow performance

Answer

Lower material cost

Question 30

What is the approximate R-value of standard duct insulation?

Accepted Answer

R-4.2

Answer

R-10

Answer

R-1.5

Answer

R-6.0

Question 31

What is the primary reason for adhering to code requirements and safety regulations in ductwork design and installation?

Accepted Answer

To protect the health and safety of building occupants

Answer

To enhance the system's energy efficiency

Answer

To reduce installation costs and time

Answer

To improve the aesthetics of the ductwork system

Question 32

In selecting the optimal duct material for a specific application, which factor holds the utmost significance?

Accepted Answer

Compatibility with the air handling system

Answer

Cost-effectiveness

Answer

Aesthetic appeal

Question 33

Which material is typically used to make round ductwork in residential HVAC systems?

Accepted Answer

Galvanized steel

Answer

PVC

Answer

Flexible duct

Question 34

When sizing round ducts for a given airflow rate and pressure drop, what factor holds the most significance?

Accepted Answer

Equivalent Diameter

Answer

Length

Answer

Shape

Answer

Material

Question 35

Which material is commonly used in the construction of flexible ducts?

Accepted Answer

Aluminized Fabric

Answer

PVC

Answer

Sheet Metal

Answer

Fiberglass

Question 36

Which organization's guidelines are widely recognized as industry standards for ductwork installation?

Accepted Answer

SMACNA

Answer

NFPA

Answer

OSHA

Answer

ANSI

Question 37

For rigid metal ducts, which substance is recommended for sealing joints?

Accepted Answer

Duct Sealant

Answer

Electrical Tape

Answer

Super Glue

Answer

Masking Tape

Question 38

Which specialized tool is used to measure air velocity within a duct system?

Accepted Answer

Anemometer

Answer

Thermometer

Answer

Manometer

Question 39

Which of the following is the predominant factor considered when determining the size of a duct?

Accepted Answer

Airflow rate

Answer

Duct shape

Answer

Ambient temperature

Answer

Duct length

Question 40

Which duct material is recognized for its exceptional durability and resistance to corrosion?

Accepted Answer

Galvanized steel

Answer

Flexible duct

Answer

Fiberglass duct

Answer

Plastic duct

Question 41

What is the primary purpose of a duct take-off?

Accepted Answer

To connect a branch duct to a main duct

Answer

To increase duct velocity

Answer

To eliminate duct noise

Answer

To reduce duct pressure

Question 42

In designing an efficient duct system, which factor is crucial?

Accepted Answer

Minimizing pressure drop

Answer

Increasing duct size

Answer

Maximizing duct length

Answer

Using non-insulated ducts

Question 43

What is the intended purpose of a duct access panel?

Accepted Answer

To provide access for cleaning and maintenance

Answer

To increase duct airflow

Answer

To reduce duct noise

Answer

To prevent duct condensation

Question 44

What is the primary function of ductwork in an HVAC system?

Accepted Answer

To distribute conditioned air throughout the building

Answer

To filter and clean the air

Answer

To generate heat or cooling

Question 45

Which of the following factors is NOT considered when selecting the size of ductwork?

Accepted Answer

Number of occupants in the building

Answer

Pressure drop

Answer

Airflow rate

Answer

Type of duct material

Question 46

Which type of joint is commonly used in sheet metal ductwork installations?

Accepted Answer

Pittsburgh lock

Answer

Soldered joint

Answer

Flanged joint

Answer

Slip joint

Question 47

When laying out ductwork, which factors should be considered?

Accepted Answer

All of the above

Answer

The airflow requirements of the system

Answer

The length and slope of the duct runs

Answer

The location of obstacles such as walls and beams

Question 48

Which type of duct material is known for its flexibility and ease of installation?

Accepted Answer

Flexible duct

Answer

Stainless steel

Answer

Galvanized sheet metal

Answer

Fiberglass

Question 49

What is the main purpose of a duct damper?

Accepted Answer

To regulate airflow

Answer

To prevent air leakage

Answer

To connect two sections of ductwork

Answer

To filter the air

Question 50

Which of the following is NOT a commonly used type of duct sealant?

Accepted Answer

Masking tape

Answer

Butyl tape

Answer

Silicone caulk

Answer

Liquid rubber

Question 51

What is the primary function of duct supports?

Accepted Answer

To prevent sagging and protect the ductwork

Answer

To control airflow

Answer

To seal air leaks

Answer

To connect two sections of ductwork

Question 52

Which industry standard provides guidelines for the design and installation of ductwork systems?

Accepted Answer

SMACNA

Answer

NFPA

Answer

NAHB

Answer

ASHRAE

Question 53

What is the recommended maximum air velocity for a typical residential duct system?

Accepted Answer

700 feet per minute

Answer

500 feet per minute

Answer

900 feet per minute

Answer

1200 feet per minute