Test 4 Flashcards
The primary component common to all PV systems is the PV array.
True
Energy storage systems are characterized by the form of energy they store and how the energy is utilized or converted into other forms.
True
Batteries in a PV system are charged by the loads and discharged by the array.
False
A rectifier is a device that converts AC power into DC power.
True
Most residential and commercial loads are DC loads.
False
Standby engine generators are designed to operate continually as a primary source of power.
False
Diesel engines are well suited for constant loads, whereas gasoline engines can respond quickly to changing loads.
True
A micro-hydroelectric turbine is a device that produces electricity from the flow and pressure of water.
True
Direct-coupled systems include the fewest components, but can be the most complex PV systems to design properly due to the lack of energy storage or system control.
True
A hybrid system is a PV system that can operate in either utility-interactive or stand-alone mode, and uses battery storage.
False
A battery ____ is a group of batteries connected together with series and parallel connections to provide a specific voltage and capacity.
bank
____ store energy in an electrical field developed by two oppositely charged parallel conductive plates separated by a dielectric (insulating) material.
capacitors
A(n) ____ is a device that converts DC power into AC power.
inverter
A ____ is a device that converts DC power from one voltage to another.
DC-DC converter
The voltage and current output from an array can vary with ____.
temperature, irradiance, and load. (all of the above)
A ____ is a device that converts mechanical energy into electricity by means of electromagnetic induction.
generator
A(n) ____ turbine is a device that compresses and burns a fuel-air mixture, which expands and spins a turbine.
gas
A(n) ____ switch allows an electrical system to be switched from a primary power source to an alternate power source in order to keep critical loads operating.
transfer
A ____ cell is an electrochemical device that uses hydrogen and oxygen to produce DC electricity, with water and heat as byproducts.
fuel
A PV system that operates in parallel with and is connected to the electric utility grid is called a(n) ____ PV system.
utility-interactive, grid-connected, and interactive (all of the above)
Batteries convert electrical energy into ____ energy when harging and vice versa when discharging.
chemical
____ are large, spinning rotors and are commonly used to transfer power from motor and engines to pumps and other rotational loads.
Flywheels
Capacitance is the ability to store and electrical charge and is measured in units called ____.
farads
A(n) ____ is device that regulates battery charge by controlling the charging voltage and/or current from a DC power source, such as a PV array.
charge controller
An electrical ____ is any type of device, equipment, or appliance that consumes electrical power.
load
A(n) ____ is a bladed shaft that converts fluid flow into rotating mechanical energy.
turbine
A(n) ____ is an electrochemical device that uses electricity to split water into hydrogen and oxygen.
electrolyzer
A(n) ____ PV system is a type of stand-alone system where the output of a PV module or array is directly connected to a DC load.
direct-coupled
____ is a metering arrangement where any excess energy exported to the utility is subtracted from the amount of energy imported from it.
net metering
____ is the undesirable condition where an interactive inverter continues to supply power to the utility grid during a utility outage.
islanding
