The _____ in an AHU is raised or lowered as necessary by changing the speed of the variable-frequency drive operating the supply-air fan.

Control of the exhaust dampers is managed by the AHU controller and is based primarily on differential ___ across the exhaust-air damper.

Control of the heating coil is managed by the AHU controller based primarilly on air ____ measurements

____ filters cause a large pressure drop and can have a significant effect on fan energy consumption

NFPA standards, applicable fire protection codes, and an owners fire insurer may affect the operation of ____ control sequences in air-handling units.

A ____ is a device that transfers heat from one fluid to another fluid without allowing the fluids to mix

____ cooling coils use a refrigeration cooling cycle.

A ____ is enabled/disabled, but not managed, by the building automation system.

A ____ is a large structure where air moves upward to mix with falling water, resulting in evaporative cooling of the water.

The two common designs of air terminal units are ___.

A ____ removes contaminated air from the building

A ____ is a relatively small device used for spot heating, meaning that there is no air distribution system.

The smoke ___ mode creates a negative pressure in the smoke area.

Refrigerant is controlled with a ___ system.

A buildings ____ system must be ULL-listed for reliability.

____ is neither controlled nor overridden by the automation system.

Monitoring of the filter pressure drop is managed by the _____

A ____ HVAC system distributes water or steam throughout a building as the heat-transfer medium for heating and cooling systems

Control of the outside-air and return-air dampers for economizing is based primarily on ____

The differential pressure between the upstream-high side and downstream-low side can be used to indicate the status of ____

Furnaces produce heat by either _____ or ____ energy`

_____ is the process of introducing fresh outdoor air into a building

A ____ is a device that measures the amount of moisture in the air

_____ is the ratio of the amount of water vapor in the air to the maximum moisture capacity of the air at a certain temperature

A ____ is a sensor that measures the velocity of air in a duct system

A _____ is a switch that activates at humidity levels either above or below a setpoint

Two types of airflow stations are ____ and ____ sensors

A flow switch is a switch with a van that moves from the force exerted by the water or air flowing within a duct or pipe

A ____ is a closed metal container that heats water to produce steam or hot water

_____ are installed within the supply duct of an AHU to add moisture to the conditioned air.

Axial-flow fans change the direction of the airflow by 90degrees, while centrifugal fans have no effect on the airflow direction

____ pumps are the most widely used type of pump in HCAV systems

Globe valves control water flow more accurately then butterfly valves

Which publication can you find the standard covering ventilation for acceptable indoor air quality

A _____ filter is used to remove odors, gases, smoke and smog from the air

Registers differ from grilles by having a ____ built in it

Free cooling strickly based on outside air temp is called _____ economizer

Temperature ____ is the variation of air temperature between the top and bottom of a space

A ____ is made from a metal alloy conductor with an electrical resistance that changes with temperature

____ is the continuous movement of air through a building and its HVAC system

____ is the process of introducing fresh outdoor air into a building

A ____ is made from a semiconductor material with an electrical resistance that changes in response to changing temperatures

A ____ is a sensor that measures the velocity of air in a duct system

A ___ air cleaner kills biological contaminants

_____ is the science of themal energy and how it transforms to and from other forms of energy.

Proper temperature, humidity, and filtration are requirements for ______

A ____ system uses water to distribute heat and/or cool to the HVAC system

A psychrometric chart requires a minimum of ____ points to use

AHUs add conditioned air to the spaces by either a constant-volume or ______ method

A ____ is a heat exchanger that removes heat from the air surrounding or flowing through it

_____ is the ratio of the amount of water vapor in the air to the maximum moisture capacity of the air at a certain temperature

A ____ is a heat exchanger that removes heat from high-pressure refrigerant vapor

A ____ is a self-contained cooling unit used with forced-air HVAC systems

A ____ is an area within a building that shares the same HVAC requirements

Electric ______ are used in electric baseboard heaters and radiant heat panels

____ is the intensity of heat required to start a chemical reaction

_____ is the number of British Thermal Units per pound or gallon of fuel

_____ is the process of cooling the air in building spaces to provide a comfortable temperature

An air conditioning system produces an ____ effect and distributes the cool air or water to building spaces

A ___ and _____ are required in absorption refrigeration systems

A simple and inexpensive energy source used to cool a building is ____

The mechanical equipment of an ___ system can be used to transfer heat from the air inside a building to the air outside a building, producing a cooling effect

The ____ has established standards for grading fuel oil

Steam or ____ us used to provide cooling in absorption refrigeration systems

____ are used in electric baseboard heaters, radiant heat panels, air handlind units, and variable air volume terminal boxes

The use of outside air for cooling is referred to as ____ cooling

Steam and hot water cooling systems normally do not use ____ avoiding the problem of refrigerant replacement

___is the chemical reaction that occurs when oxygen reacts with the hydrogen and carbon present in a fuel at ignition temperature

____is the ability of a liquid to resist flow

A ____ system uses the absorption of one chemical by another chemical and heat transfer to produce a refrigeration effect

____ is provided if the outside air temperature drops below a set temperature or if a heat pump fails

A _____ is a mechanical device that compresses refrigerant or other fluid

A _____ is a system that uses a liquid(normally water) to cool building spaces

______ cooling systems are commonly used for large commercial or industrial applications in which mechanical compression systems are not as efficient

The _____ consists of the circuit conductors between a buildings electrical supply source and the final branch-circuit device

A ____ is a company that generates and/or distributes electricity to consumers is a certain region or state

A ____ is the last point of power distribution for the power company and the beginning point for the property owners electrician

A _____ is a device that isolates an electrical circuit from a power source

A _____ is an end-use point in the power distribution system

An ____ is an overcurrent protective device with a fusible link that melts and opens the circuit when an over current condition occurs

Electricity ____ is the total amount of electricity used during a billing period

A ____ is a heavy-duty relay for switching circuits that have high- power loads

A____ is a electrical device that provides stable and reliable power, even during fluctuations or failures of the primary power source

The alteration of power sources to supply the buildings electrical system is managed by an ____

_____ is the complete interruption or resumption of electrical power to a device

_____ is the difference in electrical potential between two points in an electrical circuit

______generation is an electrical distribution system in which electricity is distributed through a utility grid from a central generating station to millions of customers

A ______ is a set of contact that belong to a single circuit

A ______ is a specialized contactor used for switching electrical power to a load and includes overload protection

A ______ is a moto controller that is used to change the speed of AC motors by changing the frequency of the supply voltage.

A____ is a conductor that connects the grounding system to the buried grounding electrode

A ______is a switch that allows an electrical system to be stitched between two power sources

A ____ is a connection at the service equipment that connects the equipment grounding conductor, the grounding electrode conductor, and the grounded conductor

A ____ is an electric device that uses electromagnetism to change AC voltage or electrically isolate two circuits

A ___ signal is commonly electrical, such as voltage, current or resistance, but may also be conveyed by air pressure, optics, or radio frequency

A ____ is a device that makes decisions to change some aspect of a system based on sensor information and internal programming

_____ allow a low-voltage controlcircuit to open or close contacts in higher-voltage load circuits.

_____ ignals convey information as either one of two extremes, such as completely on or completely off, or completely open or completely closed

A ___ point is the actual value that a control system experiences at any given time and can be both inputs and outputs

_____ control saves energy by reducing the heating and/or cooling load when a building is unaccupied

A ____control algorithm is a control algorithm in which the output is determined by the sum of the offset over time

____ control is a supervisory control strategy designed to reduce a buildings overall electrical demand

A ____ table is a table that prioritizes the order in which electrical loads are turned off

_____ maintenance attempts to detect equipment problems with vibration analysis and other data collection methods

_____ is probably the most significant benefit of a building automation system

The power to a self-contained control system is supplied by a sealed, fluid filled ____

A ___ ia a sensing device that consists of two different metals joined together that expand and contract at different rates with temperature changes

A ___ control system is a control system in which compressed air is used to provide power and control signals for the control system

A ___ is an orifice that allows a small volume of air to be expelled to the atmosphere

____controllers are limited to communicating only with the few sensors and actuators to which they are directly connected

X10 technology is a control protocol that uses ____ signals to communicate between devices

Commercial buildings include offices, schools, hospitals, warehouses, and ___

Diivision 25 of the _____ contains specifications for integrated automation

A _____ system is a building system that controls a buildings indoor climate