Quiz 3 (Ch 36, 44, 45, 46)
The solar constant is the energy flow outside the atmosphere of approximately _____.
1.35 kW/m2
In a single-family residence, line voltage is considered _____.
120 Vac or 240 Vac
Low-voltage thermostat wiring for lengths over 50′ (15 m) should normally be at least _____.
16 AWG
Low-voltage thermostat wiring for lengths up to 50′ (15 m) should normally be at least _____.
18 AWG
A low-voltage thermostat is typically supplied with _____.
24 Vac
For all-season home hot water heating, a solar collector should be angled upward about _____ from the horizontal.
35° to 45°
A solar energy collector that uses a series of flat plates with an insulated surface to collect solar energy is a _____.
Flat-plate collector
What device is used to connect networks within a system as well as to connect nonnative controllers and devices to the system?
Gateway
Which of the following statements regarding pneumatic control systems is false?
They were inexpensive to install.
A multistage thermostat for a heating system will have more than one _____ wiring terminal.
W
A multistage thermostat for a cooling system will have more than one _____ wiring terminal.
Y
For a solar PV system to be off -the-grid and able to operate standalone, it must have _____.
a bank of batteries and an inverter
For a solar PV system to engage in net metering, it must have _____.
a connection to the electrical grid and an inverter
When an air-based solar heating system uses electric resistance heating to supplement heat, _____.
a direct electric resistance radiator may be installed in the air ducts
A cooling anticipator is always installed in _____.
a low-voltage dc circuit
A heat anticipator is always installed in _____.
a low-voltage dc circuit
Millivolt thermostats can only be used in certain _____ systems.
air conditioning
Input devices in a DDC system may monitor _____.
ambient temperature, airflow, & humidity
When a liquid-based solar heating system uses electric resistance heating to supplement heat, _____.
an electric heating element can be installed in an auxiliary tank
To control higher-current loads, a low-voltage thermostat will usually use _____.
an isolation transformer
Direct digital control (DDC) is a type of control system that uses _____ to control an HVAC or automated building system.
analog and digital electric signals
To test a home for air infiltration and locate leaks, perform a(n) _____.
blower door test
If a multistage thermostat signaled for a cooling system's scroll compressor to run at less than full capacity, the scroll compressor would _____.
bypass a small amount of discharge vapor into the suction line
In the event of a mercury spill, _____.
call local hazardous material disposal agency
A line-voltage thermostat _____.
can conduct higher current than other types of thermostats
The process used by a latent TES system _____ of the storage medium.
changes the physical phase
Workstations that send instructions to and receive information from servers may be referred to as _____.
clients
A rough estimate of a home's energy efficiency can be done by _____.
comparing its energy usage to similar houses in the same locality
A mechanical HVAC system that uses ice storage as its CTES system saves money by running its _____ during off -peak hours.
compressor
A solar cooling system usually uses _____ collectors.
concentrating
An energy audit for a large commercial or industrial complex can be done by a single auditor and take the same amount of time and eff ort as required for a single-family home residence.
day of the week, time of day, & total amount of energy used at a given time
In solar domestic hot water (DHW) systems, antifreeze _____.
does not come into contact with the water supply
In a single-family residence, a line-voltage thermostat is primarily used to control _____.
electric baseboard heaters
If a forced-air electric heating system with a multistage thermostat was turned on and sensed that temperature was significantly below set point (more than 20°F or 11°C), it would _____.
energize all of the heating elements
A combination of inorganic salts, water, and various elements that are formulated to freeze at a desired temperature is called _____.
eutectic salts
An efficient type of solar collector that uses tubes containing fluid contained within slightly larger glass tubes that are in vacuum describes _____.
evacuated tube collectors
The passing of inside air out of a building is referred to as _____.
exfiltration
An advantage that millivolt thermostats have over other thermostats is that they require no _____.
external power source, hardware, and wiring
For a heating thermostat, system lag occurs when temperature _____.
fails to reach the cut-in value
An energy audit for a large commercial or industrial complex can be done by a single auditor and take the same amount of time and eff ort as required for a single-family home residence.
false
An energy audit is concerned with energy usage and does not take into account the weather data where a building is located.
false
Building performance encompasses the scientific principles related to building science.
false
For a residential energy audit, it is important to check the age and maintenance of the heating and cooling system, but you should not bother examining ductwork, registers, and dampers.
false
In a passive solar energy system, the solar energy is absorbed into a collector
false
In warm climates, the solar heating system for a swimming pool always requires protection from freezing temperatures.
false
Primary controllers receive the output signal as an input signal.
false
A black object's temperature can be increased by placing a(n) _____ cover over its black surface.
glass
A drainback system uses _____ to remove liquid from the collectors whenever the pump is off.
gravity
The shorter the wavelength, the _____ of the wave.
greater the energy
Temperature swing is the total difference between _____.
high and low temperatures in a room
A solarium or other passive solar heating system relies heavily on floors and walls that have a _____.
high thermal mass
The difference between a heating-only thermostat with two wires and a heating-only thermostat with three wires is the addition of a(n) _____.
holding circuit
The passing of outside air into a building is referred to as _____.
infiltration
Light radiation with wavelengths that are greater than 740 nanometers (nm) is called _____.
infrared radiation
A solar energy system that includes batteries in its circuit _____.
is ideal for roadside signs in remote areas, may be used to help power satellites, and works well for many portable electronics
Total energy management is a conservation concept in which a building is viewed in terms of _____.
its total energy usage
Occupants in a building can be a source of _____.
latent and sensible heat
A thermostat that remembers set points and adapts system operation and cycles accordingly is a _____ thermostat.
learning
The primary purpose of a multistage thermostat is that it can control an HVAC system's _____.
length of operation
A switch used with a bimetal coil that consists of a glass tube containing wire contacts and a puddle of liquid metal and that changes position based on its physical position is a _____ switch.
mercury
The type of HVAC system operation that regulates the increase or decrease of intensity and can result in significant energy usage reduction over time is _____ operation.
modulating
The longer a bimetal coil is, the _____.
more bending movement it can produce
A solar absorption air-conditioning system can produce more cooling when there is _____.
more sun
A program in which homeowners connected to the power grid can sell excess energy they generate back to the utility company is called _____.
net metering
A cooling anticipator's purpose is to switch _____.
off the blower before turning off the compressor
A heat anticipator's purpose is to switch _____.
on the heating system just before reaching the cut-in temperature
Most ultraviolet radiation is absorbed by _____.
ozone
Solar energy can be described as a stream of _____.
photons
A thermostat that draws a small amount of power from the low-voltage side of the HVAC system control to operate its electronics is a _____ thermostat.
power-stealing
Being able to schedule automatic operation using user set points is an advantage of a _____.
programmable
The process used by a sensible TES system _____ of the storage medium.
raises and lowers the temperature
A switch used with a bimetal coil that consists of a pair of contacts in a glass tube that changes position based on magnets is a _____ switch.
reed
To prevent relay activation and other circuit board problems, power-stealing thermostats often require the addition of a bypass _____ to the circuit.
resistor
Passive liquid-based solar heating systems use water's natural tendency to _____.
rise as it heats and fall as it cools
For a heating thermostat, system overshoot occurs when temperature _____.
rises above the cut-out value
The VA rating of step-down transformers used with thermostats is used to determine _____.
secondary side current rating
A special absorber surface used to increase the temperature of a collector is described as a(n) _____.
selective surface
A _____ is a device that measures a physical quantity and provides an output based on the measured value.
sensor
Solar cells can be connected in _____ to obtain higher voltages.
series
As an object gets hotter, the wavelength at which the most radiation is given off becomes _____.
shorter
Solar modules are constructed into a _____.
solar array
The device most commonly used to convert radiant energy to electricity is a _____.
solar cell
The electrical load that a millivolt thermostat is used to actuate is a _____.
solenoid valve
Energy use intensity (EUI) shows a building's annual energy use per _____.
square foot
To operate, a millivolt thermostat depends on a(n) _____.
standing pilot light
The number of wires to connect to a combination thermostat depends primarily on _____.
technician preference
In simplest terms, a thermostat is a sensing device that reacts to _____.
temperature
Electronic thermostats use a _____ to sense air temperature.
thermistor
The sensing element used in millivolt thermostats is a(n) _____.
thermocouple
A building automation system increases building efficiency by causing each subsystem to operate at peak efficiency without compromising functionality of any of the other subsystems.
true
A solar array can be used to power a dc electrical device.
true
BACnet is a set of rules for hardware and software communication that allows controllers from one company to work with those from another company.
true
Direct digital control can be used to manipulate compressor operation.
true
The ability of modern thermostats to interface with mobile devices (smartphones, laptops, etc.) allows users to remotely control indoor environments.
true
The end result of an energy audit should be the reduction of a building's energy cost and usage.
true
The term thermal energy storage (TES) refers to the temporary storage of heat energy for later use.
true
Light radiation with wavelengths that are less than 380 nanometers (nm) is called _____.
ultraviolet radiation
The forced airflow that takes place by design between the inside and outside of a building is referred to as _____.
ventilation
Light radiation with wavelengths between 380 nanometers (nm) and 740 nanometers (nm) is called _____.
visible light
The heat generated by lighting is in direct proportion to its _____ rating.
wattage
