Chapter 10

Question 1

Humidity, temperature, motion of air without objectionable noise, freshness, and cleanliness are a range of conditions that make up the:

Answer 1

Comfort zone

Question 2

Ron understands that air pressure influences the delivery of air through the duct system of his building. Air pressure within a typical HVAC system is ______ than atmospheric pressure.

Answer 2

Slightly more

Question 3

Since he is not constrained by the aesthetics of the application, William wants to design duct work with a(n) ______ for lower energy consumption.

a. average aspect ratio
b. low aspect ratio
c. high aspect ratio
d. medium aspect ratio

Answer 3

B. Low aspect ratio

Question 4

The duct system in John’s building has a duct that penetrates a floor. Therefore, in order to prevent the spread of fires, a ________ is required, which closes automatically if excess heat is detected.

Answer 4

Fire Damper

Question 5

Cheryl is modifying the conditioned space in her building. To ensure air is balanced for effective distribution, Cheryl should:

Answer 5

Hire an independent air-balancing firm to review the air balance.

Question 6

Which typ of terminal unit would receive air at a variable temperature that is adjusted to take care of the cooling load, or is supplied with constant temperature cold air and uses a heating coil to reheat the cold air to the required temperature?

a. dual-duct terminal unit
b. single-duct terminal unit
c. VAV terminal unit
d. induction terminal unit

Answer 6

b. single-duct terminal unit

Question 7

The design engineer had to recommend against the use of slot diffusers for the HVAC system as the outlets exceed the maximum recommended height of

Answer 7

3 inches

Question 8

A _____ is the most common fan used for air-conditioning and ventilation systems and is classified by the blade design rather than by the function performed.

Answer 8

Centrifugal fan

Question 9

Because they are compact and easily installed, Rebecca chose _____, the most common type of coil used in air-handler systems of commercial buildings.

a. finned-tube coils
b. air washers
c. water washers
d. sprayed coils

Answer 9

A. finned tube coils

Question 10

When researching air-conditioning system filters for her building, Janet learned that there are four classifications of filters. She decides that______filters would be appropriate for her building’s units since this type removes gases from the air.

Answer 10

Carbon filters

Question 11

Jim is concerned about the level of toxic engine exhaust fumes in his underground parking garage. So he ensures that the ventilation rate for the garage is accurate, typically about _____ cfm per swuate foot of floor space.

Answer 11

1