ACR 201 Final

Which of the following types of fan is used to move large amounts of air against a low static pressure drop?

• 1. Vane axial

• 1. Centrifugal

• 1. Large

• 1. Propeller

True or False: Turbulence in airflow causes friction drop

• True

• False

Pressure in ductwork is expressed in which of the following?

• Inches of water column

• PSIG

• PSIA

• Inches of HG

What is a common instrument used to measure pressure in ductwork?

Warm air heats a room better if distributed

• low in the room

• high in room

• behind the furniture

• under the curtains

Why are dampers recommended in all branch lines?

• to increase static pressure in the trunk line

• to decrease static resistance in the run

• to balance air flow in the zone

• to keep the branch line from sweating

Zoning an air-conditioning or heating system allows for

• temperature control of individual rooms or areas in the space

• simultaneous heating and cooling of individual rooms in a structure

• neither A or B

• both A and B

True or False: Zoning an air conditioning system can only be done when the system is initially designed and installed?

• True

• False

The average velocity for a 16" round duct is 800 FPM; the airflow in the duct is____CFM

If a rectangular duct system (12"x26") has an average air velocity of 700FPM, what is the airflow?