Chapter 128

Question 0

Ducts of large dimensions must be diagonally creased to:
A) provide stiffness
B) allow gradual duct size changes
C) decrease duct weight
D) increase air velocity
E) decrease air friction in the duct work

Answer 0

A) provide stiffness

Question 1

When all of a supply air duct is outside the conditioned space, there is a certain leakage. What must the leakage be added to?

Answer 1

Calculated sensible heat load for the room

Question 2

Modulating dampers in air handling systems are used:
A) as mixing boxes to proportion the amounts of two different air flows such as outdoor air and recirculated air
B) to modulate the volume of conditioned air needed to meet load requirements
C) as face dampers to modulate the volume of air that goes through a cooling or heating coil
D) as bypass dampers to throttle the balance of the constant total air flow around a heating or cooling coil
E) all of the above

Answer 2

E) all of the above

Question 3

Functions of terminal air distribution devices are accomplished by what four methods?

Answer 3

Diffusion, induction, entrainment, aspiration

Question 4

The minimum recommended height for roof mounted louvres for most areas is:
A) 0.5 meters above the roof
B) 2 meters above the roof
C) 1 meter above the roof
D) 1.25 meters above the roof

Answer 4

C) 1 meter above the roof