TEST 4
The four stages of a fire are
incipient, smoldering, flame, heat
"Romex" is a type of
nonmetalic sheathed cable (typically used in small buildings)
A CLO is a unit that measures the insulating value of clothing. A single CLO is equivalent to which of the following:
A business suit
Under normal comfort conditions, the body experiences ______________ of heat loss through evaporation.
15%
Which of the following system voltages is most likely to be used as the primary distribution system in a large commercial or institutional building
277 / 480 volt, 3-phase, 4-wire
Single-axis tracking can increase insolation by ______ throughout the year
35% to 50%
Voltage drop in a feeder or branch circuit should generally be limited to
5% or so
Electricity in Europe and much of Asia is typically
50hz
Electricity in the US is typically
60hz
Typical efficiencies for today's commercial photo voltaic cells is around
8% - 12%
The primary components of a compressive refrigeration cycle include:
Evaporator, condenser, compressor, expansion valve
"Heat pump" is a term used to describe equipment that:
Can provide either heating or cooling (heating-cooling)
An increase in occupancy can directly result in an increase in:
Carbon Dioxide (CO2)
The design process generally flows from:
Conceptual design, to schematic design, to design development
Which (one or more) of the following ratios are actually reasonably important to appropriate performance of passive cooling?
Cross ventilation, Direct gain solar heat gain, Day lighting
Which (one or more) of the following ratios are actually reasonably important to appropriate performance of active cooling?
Cross ventilation, Direct gain solar heating, and Conventional cooling.
The psychometric chart shows the relationship of:
Dry-bulb temperature, wet-bulb temperature, RH
____ is the most prevalent form of E used in modern buildings
Electricity
Electrical loads in buildings generally include
HVAC equipment, lighting, kitchen equipment, plumbing/piping equipment, vertical transport equipment
Problems with poor indoor air quality in buildings seem to be increasing because:
More aggressive indoor pollutants have developed due to global warming
Control of the following air properties is critical when designing for comfort (Choose three):
Motion, relative humidity (RH), and particulate content (pollution)
NFPA stands for
National Fire Protection Association
Mechanical combustion results from all of the following EXCEPT
electric lighting
Which of the following best describes the sources of pollutants normally found in buildings?
Processes, equipment, occupants, finishes, and furnishings
The primary difference between sensible and latent heat is:
Sensible heat affects dry-bulb temperature, whereas latent heat affects moisture content
The concept of "distribution tree" is used to describe:
The means by which cooling and heating are delivered from a central system to conditioned space
Efficacy of a light source is best defined as:
The ratio of lumens provided to energy used
"Hydronic" refers to a system that uses:
Water for distribution of heat
At 100% relative humidity:
Wet-bulb temperature is equal to DB temperature
The difference between a cable and a wire is
a cable is a large wire or an assembly of wires
An electric closet is generally
a fairly small room used to house electric equipment and distribute power to branches
Materials utilized as fire barriers within buildings may also be useful for
acoustic isolation of airborne sound
Transformers may require a protective vault because
an oil-filled transformer is a potential fire hazard
A cable tray is best described as
an open support system for cables
deluge
areas with very high fire hazards
Fuses and circuit breakers
have similar uses but different construction and operation
switches and contactors
have similar uses but slightly different construction
Dry-type electrical transformers
can be installed virtually anywhere in the building
Reliability of a building electrical system is
dependent upon both the buildings electrical system and the utility service
all of the follwing are advantages to underground electric service except
ease of repair
wet pipe
everyday building occupancies
the following smoke control strategy is particularly useful in large atrium spaces
exhaust
Which of the follwing subsystems is less likely than the others to be controlled by a "building automation system (BAS)"
fire suppression
The 3 elements of the fire triangle of needs are
fuel, high temperature, and oxygen
The NEC provides regulations that define
fundamental safety measures for the use of electrical equipment and systems
The National Electric Code
is very specific about acceptable wiring materials and capacities
The purpose of a service switch is to
isolate items of electrical equipment for maintenance and repair
When a conventional automatic sprinkler system operates during a fire
only a very few sprinkler heads go off
Energy used is the product of
power and time
Computer grade power refers to
power that is generally free of power quality problems
An ionization type fire detector will be used to sense
products of combustion generated in the early stages of a fire
The overriding design objective for any electric power distribution system is
safety
portable fire extinguishers would normally be
selected and specified by the architect
When considering property protection, the designer must address _______ very early in the schematic design process
site access for fire fighting equipment
Most fire related deaths are a result of
smoke inhilation
A standby power system is intended to meet loads that will cause inconvenience of some sort if power supply fails; an emergency power system is intended to meet loads
that will endanger occupant safety if power fails
The most common motor in building applications is
the AC squirrel-cage motor
"insolation" can best be defined as
the amount of solar Energy received by a given area; representing a time-averaged value
The difference between a conventional and an addressanle fire alarm system is
the conventional only transmit signals when a condition is detected, the addressable transmits signals on a regular basis
To maximize the total annual isolation for a stationary solar array, the tilt angle should be approximately equal to
the latitude of the site
Current is the electrical term used to describe
the magnitude of the flow of electrons through a circuit
Conductor "ampacity" is determined by
the maximum safe operating temperature of the installation used on the conductor
Power factor represents
the phase difference between voltage and current
Standpipe and hose systems are classified primarily according to
the type of person expected to use the system
The angle, measured from the horizontal, at which a flat-plate collector is mounted is known as the
tilt angle
The objective of an electrical demand control system is
to reduce peak building energy consumption
Ventilation is generally required for indoor transformer installations because
transformers generate a great deal of heat during operation
Which means of service delivery is typically more expensive to install
underground service
A VVF or VFD control system is used to
vary speed of a motor
Ohm's Law establishes the relationship between
voltage, current, and resistance
Underfloor duct distribution systems will typically be used
where flexibility is critical and other systems are not applicable or appropriate