13- EHS- Section 8 Flashcards
In a Grid Tied solar PV system, what happens to excess electricity?
a. Stored in batteries
b. Sold back to the grid
c. Used to power nearby buildings
d. Converted into heat energy
B
Grid Tied systems generate electrical power through solar PV panels and any excess electricity is sold back to the grid. A typical system is made up of solar panels, combiner boxes, inverter,
disconnect devices and metres
What is the basic generating element in a solar PV system?
a. Inverter
b. Battery
c. Charge controller
d. PV panel
D
The solar PV panel is the basic electricity generating element in the system.
What is the purpose of the inverter in a solar PV system?
a. Store excess energy
b. Convert DC to AC
c. Control charge flow
d. Disconnect the system
B
Since solar PV systems produce DC power, an
inverter is required to convert the DC electrical
energy to alternating current, AC. Inverters can
be located on the roof, exterior or interior wall,
garage, basement near the main electrical panel,
attics or lots
Where can inverter boxes be located in a solar PV system?
a. Only on the roof
b. Exterior or interior wall
c. Basement near the main electrical panel
d. Only in the garage
e. Any of the above
E
. Inverters can
be located on the roof, exterior or interior wall,
garage, basement near the main electrical panel,
attics or lots
What is a characteristic of Off-Grid solar PV systems?
a. Connected to the larger electrical grid
b. Rely solely on PV panels
c. Sell excess electricity
d. Require no batteries
B
Of Grid or stand alone systems, typically found in
rural or remote areas, rely solely on PV panels to
produce direct current (DC) electrical energy and
contain battery banks to store the energy.
What is the purpose of disconnecting devices in solar PV systems?
a. Increase energy production
b. Provide disconnection of all electrical equipment
c. Improve battery efficiency
d. Control inverter operation
B
Depending on the location of the disconnecting device, emergency responders will be exposed to continually electrically energized ‘live’ components
In which type of wind system are turbines arranged into an array or wind farm?
a. Small wind system
b. Large wind system
c. On-Grid wind system
d. Off-Grid wind system
B
A large wind system consists of one or more wind
turbines with a rated output exceeding 100 kW.
Large wind systems will typically have a number
of wind turbine towers arranged into an array or
wind ‘farm’.
What is a Nacelle in the context of wind turbine technologies?
a. A type of battery
b. The body covering the gear and generator
c. A type of solar panel
d. The main disconnecting device
B
A Nacelle is the body, shell and casing covering the gear box, generator, blade hub and other parts mounted on the top of the tower structure of a propeller-type wind turbine. It is electrically connected to the rest of the wind turbine generator electrical system after installation
Why should emergency responders establish a contact list of solar panel installers?
a. To promote renewable energy
b. To get discounts on solar panels
c. To safely assist and advise on disconnection
d. To report illegal activities
C
Emergency responders are encouraged to develop a contact list of solar panel installers/
maintainers to safely assist and advise on the disconnection of alternative generation systems
What is the danger when a wind turbine is disconnected from the utility source?
a. Overheating
b. Loss of energy production
c. Wires remaining electrically energized
d. Increased noise production
C
When a turbine is disconnected from the utility source, the turbine will continue to produce energy as long as the blades continue to rotate. Wires inside the structure will remain electrically energized ‘LIVE’. Some wind generating systems may employ storage batteries similar to those found on large UPS systems (uninterruptable power supplies).
What is a fuel cell’s method of electricity generation?
a. Mechanical energy conversion
b. Chemical reaction
c. Solar energy absorption
d. Wind turbine rotation
B
A fuel cell is a device that generates a DC electrical current by the electromechanical combination of a continuously supplied gaseous fuel and oxidant. The fuel cells may be either stationary or portable
What fuels can be used in fuel cells?
a. Only natural gas
b. Only hydrogen
c. A variety of gases, including natural gas and hydrogen
d. Only gasoline
C
Fuel cells can run on a variety
of fuels including natural gas and hydrogen
Why are fuel cell disconnection devices required to be labeled?
a. To meet government regulations
b. To improve aesthetics
c. To warn about potential hazards
d. To track maintenance records
C
Disconnecting device is required to be labelled and installed within site of the fuel cell or integral to the equipment. The location of the manual fuel shut-of valve should be marked at the location of the primary disconnecting device of the incoming building supply.
What is a common hazard associated with illegal grow operations?
a. Overloaded circuits
b. Excessive noise
c. Exposure to toxic chemicals
d. Poor lighting conditions
A
Dangerous wiring methods are typically used to
avoid suspicion that would be associated with
the very high consumption of electrical power.
Typically the electrical service has been tampered
with in order to by-pass the electrical meter and
tap directly into the incoming electrical utility line.
What is the primary reason for dangerous wiring methods in grow operations?
a. Energy efficiency
b. Avoiding suspicion of high power consumption
c. Compliance with safety standards
d. Aesthetic reasons
B
Dangerous wiring methods are typically used to
avoid suspicion that would be associated with
the very high consumption of electrical power.
