Air Distribution System Quiz

Within an air distribution system, the highest pressure is found at the _____.

• conditioned space

• inlet to the return duct

• inlet to the blower

• outlet of the blower

The static pressure, velocity pressure, and total pressure measured in a duct system are typically measured in (a)   .

• pounds per square inch or kPa
• inches of mercury or centimeters of
• inches of water column or centimete
• cubic feet per minute or cubic mete

An air distribution system for a light commercial building is designed to work with a 5-ton cooling system. The system blower should be capable of supplying (a)   cfm of airflow.

• 1,200 cfm
• 1,650 cfm
• 2,000 cfm
• 2,350 cfm

External static pressure loss is the _____.

• total pressure loss in the air handler and its component parts

• total pressure loss in an air distribution system, excluding the blower itself

• total pressure drop across the air handler

• difference between the total pressure and the static pressure

A psychrometer is used to measure (a)   .

• humidity
• temperature
• air pressure
• wind speed

The type of blower or fan that is best suited to applications with a high resistance to airflow is the (a)   .

• forward-curved centrifugal blower
• backward-inclined centrifugal blowe
• propeller fan
• radial centrifugal blower

An existing air distribution system has 6,000 cfm of airflow created by a blower operating at a speed of 1,200 rpm. To reduce the airflow to 5,000 cfm, what new blower speed is required? (a)  

• 833 rpm
• 1,000 rpm
• 1,150 rpm
• 1,300 rpm

The duct material that has the least friction loss is _____.

• sheet metal

• fiberglass ductboard

• flexible duct

• internally insulated sheet metal

The device containing a fan that is used to depressurize a building for duct leak-testing is called a (a)   .

• Blower door
• Pressure gauge
• Ventilator
• Air handler

The sum of the static pressure and the velocity pressure in an air duct provides the (a)   .

• Total pressure
• Dynamic pressure
• Atmospheric pressure
• Partial pressure