ACR-201 Unit 37 test

The propeller-type fan is most often used as a(n) ___________.

• centrifugal blower

• exhaust fan or a condenser fan

• blower motor in a residential gas furnace

• all of the above

The two types of drive assemblies that are commonly used to turn fans and blowers are __________.

• rotary drive and scroll drive

• direct drive and rotary drive

• belt drive and direct drive

• screw drive and rotary drive

A(n) ________ is recommended on all installations to prevent noise transmission through the duct system.

• vibration eliminator

• electronically commutated motor (ECM)

• direct-drive blower assembly

• fiberglass plenum

The return duct system distributes air to the terminal units, registers, grilles, or diffusers in the conditioned space.

• True

• False

Plenum, extended plenum, reducing plenum, or perimeter loop are all types of ________.

• ventilation methods

• duct materials

• duct systems

• air balancing methods

A __________ is used to make a duct more rigid, which prevents it from swelling and making noises when the blower starts and stops.

• cross-break

• takeoff fitting

• balancing damper

• vibration eliminator

Flexible round duct comes in sizes up to about 24 inches in diameter and 25 feet of length to a box.

• True

• False

A branch duct should be fastened to the main trunk line with a __________.

• flex connector

• boot

• takeoff fitting

• end cap

________ is a very thick, putty-like substance that is applied to the duct connections to help make the system airtight.

• Foil tape

• Duct insulation

• Double-sided tape

• Mastic

Two ways that fresh air can enter a structure are infiltration and ventilation.

• True

• False