HVAC Ductwork Quiz: Test Your Knowledge on Ductwork Design & Installation

Question 1

Which of the following materials is predominantly used for constructing rectangular air ducts?

Accepted Answer

Galvanized steel

Answer

PVC

Answer

Copper

Answer

Fiberglass

Question 2

What is the primary objective of employing a transition fitting in ductwork?

Accepted Answer

To establish connections between ducts of differing shapes or dimensions

Answer

To provide an access point for maintenance

Answer

To mitigate noise levels

Answer

To prevent condensation formation

Question 3

In low-pressure duct systems, which type of duct joint is commonly utilized?

Accepted Answer

Slip joint

Answer

Welded joint

Answer

Riveted joint

Answer

Flanged joint

Question 4

What is the principal purpose of a duct liner?

Accepted Answer

To reduce noise levels

Answer

To prevent condensation formation

Answer

To improve insulation

Answer

To enhance airflow

Question 5

When sizing ductwork, which factor is typically not taken into consideration?

Accepted Answer

Ceiling height

Answer

Friction loss

Answer

Airflow rate

Answer

Velocity

Question 6

In ductwork, what is the main purpose of a plenum?

Accepted Answer

To facilitate even air distribution throughout a space

Answer

To prevent condensation formation

Answer

To provide an access point for maintenance

Answer

To reduce noise levels

Question 7

In high-pressure systems, which type of ductwork is commonly employed?

Accepted Answer

Spiral duct

Answer

Flexible duct

Answer

Oval duct

Answer

Rectangular duct

Question 8

For supply air ducts in residential buildings, what is the recommended velocity range?

Accepted Answer

400-600 fpm

Answer

1000-1200 fpm

Answer

200-300 fpm

Answer

700-900 fpm

Question 9

Which instrument is used to measure the airflow rate in ductwork?

Accepted Answer

Anemometer

Answer

Thermometer

Answer

Manometer

Question 10

What is the primary function of a damper in ductwork?

Accepted Answer

To regulate airflow

Answer

To reduce noise levels

Answer

To prevent condensation formation

Question 11

Which of the following is a primary function of ductwork in an HVAC system?

Accepted Answer

Distribute conditioned air throughout the building

Answer

Filter dust and contaminants

Answer

Control humidity levels

Answer

Provide sound insulation

Question 12

Which of the following is a consideration when sizing ductwork?

Accepted Answer

Airflow rate and pressure drop

Answer

Material cost

Answer

Length of duct run

Answer

Aesthetics

Question 13

What is the purpose of using dampers in ductwork systems?

Accepted Answer

Control airflow volume and direction

Answer

Provide soundproofing

Answer

Prevent backdraft

Answer

Filter contaminants

Question 14

Which of the following is a benefit of using flexible ductwork?

Accepted Answer

Ease of installation in tight spaces

Answer

Reduced noise levels

Answer

Improved energy efficiency

Answer

Increased airflow capacity

Question 15

Which of the following is a common material used for constructing rectangular ductwork?

Accepted Answer

Galvanized steel

Answer

PVC

Answer

Copper

Question 16

Which duct shape is generally preferred for residential applications due to its efficient airflow and ease of installation?

Accepted Answer

Rectangular

Answer

Round

Answer

Oval

Answer

Square

Question 17

What is the primary function of a duct transition?

Accepted Answer

To smoothly connect duct sections of different shapes or sizes.

Answer

To increase airflow velocity.

Answer

To reduce noise levels within the ductwork.

Question 18

Which type of ductwork is typically used in applications where space is limited?

Accepted Answer

Flex duct

Answer

Spiral duct

Answer

Rigid duct

Question 19

What is the main purpose of insulation in ductwork?

Accepted Answer

To prevent heat loss or gain from the air flowing through the ducts.

Answer

To reduce noise levels within the ducts.

Answer

To increase airflow velocity.

Question 20

When sizing ductwork, which factor is most critical to consider?

Accepted Answer

Airflow requirements of the system.

Answer

The length of the duct run.

Answer

The type of duct material.

Answer

The number of bends in the ductwork.

Question 21

What is the primary advantage of using a plenum in a duct system?

Accepted Answer

To distribute airflow evenly to multiple outlets.

Answer

To prevent air leaks.

Answer

To increase airflow velocity.

Answer

To reduce noise levels within the ductwork.

Question 22

Which type of ductwork installation method is typically preferred for residential applications?

Accepted Answer

Concealed within walls or ceilings

Answer

In the attic or crawlspace

Answer

Underneath the floor

Answer

Exposed on the exterior of the building

Question 23

What is the primary cause of excessive noise in ductwork?

Accepted Answer

Turbulence created by sharp bends or obstructions.

Answer

Insufficient airflow velocity.

Answer

The use of flexible duct materials.

Answer

Air leaks within the duct system.

Question 24

How can air leaks in ductwork be minimized during installation?

Accepted Answer

Using sealant tape and proper sealing techniques.

Answer

Increasing the airflow velocity.

Answer

Adding insulation to the ductwork.

Question 25

What is the primary purpose of a register in a duct system?

Accepted Answer

To control the airflow direction and volume into a specific room.

Answer

To reduce noise levels within the ductwork.

Answer

To increase airflow velocity.