NATE Industry Competency Exam: Air
Distribution
Cross breaking sheet metal duct will:
a. Weaken the duct and prevent contamination.
b. Stiffen the duct and reduce noise.
c. Increase the cost of the duct and prevent joint splitting.
d. Improve the appearance of the duct and prevent zinc cracking. - ✔✔ correct answer B
Which of the following is one of the most common disadvantages of using flex duct in comparison to
sheet metal duct?
a. Less pressure drop.
b. More fittings required.
c. More pressure drop.
d. Increased installation time. - ✔✔ correct answer C
The tool most commonly used to cut circles in sheet metal is the:
a. Notcher.
b. Aviation snip.
c. Bulldog snip.
d. Crimper. - ✔✔ correct answer B
The purpose of using a flexible duct connector between the air handler and the sheet metal duct is to:
a. Simplify the installation of a central air handler and ductwork system.
b. Eliminate the transmission of vibrations from the air handler to ductwork.
c. Provide a convenient site for obtaining temperature and static pressure readings.
d. Provide a leak proof connection. - ✔✔ correct answer B
, NATE Industry Competency Exam: Air
Distribution
Which instrument can be used to check the velocity of air through a register?
a. Pyrometer.
b. Anemometer.
c. Hygrometer.
d. Tachometer. - ✔✔ correct answer B
Velocity pressure is computed by subtracting the static pressure from the:
a. Absolute pressure.
b. Gauge pressure.
c. Total pressure.
d. Differential pressure. - ✔✔ correct answer C
Which instrument is used to check the velocity of air through a coil or of air coming out of a duct outlet?
a. Pyrometer.
b. Velometer.
c. Hygrometer.
d. Refractometer. - ✔✔ correct answer B
In a 12"x12" ID duct the air velocity is measured at 800fpm, what is the airflow?
a. 144 CFM.
b. 400 CFM.
c. 800 CFM.
Distribution
Cross breaking sheet metal duct will:
a. Weaken the duct and prevent contamination.
b. Stiffen the duct and reduce noise.
c. Increase the cost of the duct and prevent joint splitting.
d. Improve the appearance of the duct and prevent zinc cracking. - ✔✔ correct answer B
Which of the following is one of the most common disadvantages of using flex duct in comparison to
sheet metal duct?
a. Less pressure drop.
b. More fittings required.
c. More pressure drop.
d. Increased installation time. - ✔✔ correct answer C
The tool most commonly used to cut circles in sheet metal is the:
a. Notcher.
b. Aviation snip.
c. Bulldog snip.
d. Crimper. - ✔✔ correct answer B
The purpose of using a flexible duct connector between the air handler and the sheet metal duct is to:
a. Simplify the installation of a central air handler and ductwork system.
b. Eliminate the transmission of vibrations from the air handler to ductwork.
c. Provide a convenient site for obtaining temperature and static pressure readings.
d. Provide a leak proof connection. - ✔✔ correct answer B
, NATE Industry Competency Exam: Air
Distribution
Which instrument can be used to check the velocity of air through a register?
a. Pyrometer.
b. Anemometer.
c. Hygrometer.
d. Tachometer. - ✔✔ correct answer B
Velocity pressure is computed by subtracting the static pressure from the:
a. Absolute pressure.
b. Gauge pressure.
c. Total pressure.
d. Differential pressure. - ✔✔ correct answer C
Which instrument is used to check the velocity of air through a coil or of air coming out of a duct outlet?
a. Pyrometer.
b. Velometer.
c. Hygrometer.
d. Refractometer. - ✔✔ correct answer B
In a 12"x12" ID duct the air velocity is measured at 800fpm, what is the airflow?
a. 144 CFM.
b. 400 CFM.
c. 800 CFM.
