Duct 1
If an air conditioning system has three independent zones, how many space thermostat will the system have
3
Standard conditions, atmospheric pressure can support a column of water that is approximately how high
34 feet
How much is flowing through a 10" x 12" duct if the air is traveling at a speed of 700 ft./min.
583 cmf
Hey streamline, takeoff fitting is designed with
A throat, that is larger than the run out duct is connected to
Which of the following sets of instruments are most similar to each other
Anemometer and velometer
Squirrel-cage-type blowers are used in conjunction with duct system because they
Are able to overcome the pressures that are present in the duct system.
Which of the following blower assembly's is used in conjunction with changeable or adjustable pulleys that can very the blower speed
Belt driver blower assembly
The type of blower assembly that utilizes both motor shaft and blower shaft bearings is the
Belt-drive blower assembly
All of the following are desirable characteristics of forced air system, except
Equipment cycling is noticeable by the occupants of the structure
And example of natural draft system is
Hot water, baseboard, heating
If a gas-fired furnace is constantly tripping on a high limit safety control, which of the following is likely NOT a cause for this condition?
Improperly balanced air distribution system
The pressure in a duck system, or measured in which unit
Inches of water column
Sheet metal duct sections are often fabricated with cross brakes to
Make the duck section more rigid
Which of the following air distribution system is commonly installed in a poured slab floor
Perimeter loop system
Which of the following are challenges that need to be addressed when a single speed blower motor is used on a zone, the air conditioning system
Reduced airflow, increased noise, evaporator coil, freezeups
An anemometer is used to directly measure the
Speed of air flowing through a duct
The pressure that represents the force, pushing out words against the walls of the duct system is referred to as the
Static pressure
Supply registers should be position and configured so that
The supply air is directed onto the walls of the room
If there seems to be reduced airflow at all supply registers locations, which of the following is the most likely problem with the system
The system air filter is dirty
Which of the following is a benefit of the reducing Plenum Air distribution system
The velocity of the air is maintained throughout the system
Which of the following is an accurate expression that release the three duct system pressure
Velocity pressure=total pressure~static pressure
Governor sheet metal is treated, coated with substance to slow the corrosion process
Zinc
Which of the following statements is accurate with regards to simple system zoning?
Zone dampers are automatically operated based on space temperature
Balancing dampers are ideally located
as close as possible to the main supply trunk.
The type of blower assembly that utilizes only motor shaft bearings is the
direct-drive blower assembly.
Ayer The enters a structure from leaks around windows and doors is best described as
Infiltration Air
The instrument that is used to measure duct system pressure is the
Manometer
Which of the following is true regarding the amperage draw of a blower motor being used to move air through a duct system
Motor amperage will go up if the door on the blower compartment is removed
Ducts are installed to
Prevent duct sweating and decrease the heat transfer rate between the air in and around the duct
