Single-zone constant-volume system with an economizer is installed. In occupied mode, when thermostat calls for cooling-

The economizer acts as the first stage of cooling, if conditions permit

In a VAV system, the demand for heat is satisfied by

a heater attached to the VAV terminal

A multi-zone constant volume system is well-suited for buildings in which

the control zone arrangement is permanent

In VAV systems with a return air fan, the fan provides

the amount of air the supply fan is moving, minus the outside air

When a parallel fan-powered VAV box is in the heating mode, the primary air damper is

at its minimum position setpoint

Comfort is normally associated with the air properties of

temperature and relative humidity

What characteristic makes a grille into a register?

An adjustable damper installed behind the face

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Commercial Airside Systems Module Review

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Questions 15

Answers

1
The packaged unit accessory used to prevent compressor oil from absorbing refrigerant is a(n)
oil defroster
crankcase heater
economizer
outdoor thermostat
2
Which economizer is capable of choosing between the use of outside or return air, based on the enthalpy of the two?
All economizers
Integrated economizers
Enthalpy economizers
Dry-bulb economizers
3
In order to modulate the flow of supply air, VAV systems may use inlet guide vanes on the fan inlet or
powered exhaust
variable speed drives
hot gas bypass
an economizer
4
Which type of system is designed to maintain a constant supply air temperature between 50°F and 60°F year-round?
VVT
VAV
Economizer
Multi-zone
5
Single-zone constant-volume system with an economizer is installed. In occupied mode, when thermostat calls for cooling-
The supply air fan stops
The relief fan cycles on
The outdoor dampers move to fully closed
The economizer acts as the first stage of cooling, if conditions permit
6
In a VAV system, the demand for heat is satisfied by
electric heaters in the air handler
a heater attached to the VAV terminal
independent baseboard heat
an independent heat pump
7
A multi-zone constant volume system is well-suited for buildings in which
the zones are very small
cooling and heating are required at the same time in the same zone
the control zones are likely to be rearranged regularly
the control zone arrangement is permanent
8
The primary source of heat for a year-round packaged air conditioner is
steam
hot water
electricity
natural gas
9
In VAV systems with a return air fan, the fan provides
the amount of air the supply fan is moving, minus the outside air
more airflow than the supply air fan provides
50 percent of the air that the supply air fan provides
the same amount of air that the supply air fan is moving
10
When a parallel fan-powered VAV box is in the heating mode, the primary air damper is
fully closed
fully open
used to control heating airflow
at its minimum position setpoint
11
What is one characteristic that sets VVT systems apart from the other approaches?
Heating cannot be provided by the central unit
Heating and cooling can be provided simultaneously
It is ideal for zones with very different heating cooling needs
The need for a bypass damper
12
Comfort is normally associated with the air properties of
temperature and dew point
temperature and enthalpy
dew point and relative humidity
temperature and relative humidity
13
What characteristic makes a grille into a register?
Being designed to fit into a 24 × 24 suspended ceiling grid
An adjustable damper installed behind the face
The absence of an adjustable damper behind the face
Widely spaced louvers on the face
14
The maximum safe concentration of carbon dioxide (CO2) in an occupied space is
1,000 ppm
1,200 ppm
900 ppm
1,500 ppm
15
The simplest form of economizer control is the
enthalpy method
powered exhaust method
dry-bulb method
integrated method

Commercial Airside Systems Module Review Flashcards | StudBud