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Question 1 of 100
Microgrids can operate in both normal mode (connected to the grid) and in islanded mode (on their own).
Question 2 of 100
What mode most closely defines the microgrid’s operation in the following image?
Question 3 of 100
Which of the following is not value added by microgrids?
Question 4 of 100
Microgrids are considered sustainable when their energy sources are renewable.
Question 5 of 100
Which of these inverters can be used in a grid-connected and islanded mode?
Question 6 of 100
Combined heat and power gas turbines:
Question 7 of 100
The efficiency and output of a solar PV system is based on:
Question 8 of 100
List the components of a battery system from smallest to largest.
Question 9 of 100
State of charge is often estimated with?
Question 10 of 100
Lead-acid batteries with thicker plates and larger acid volume are typically for:
Question 11 of 100
The discharge rate of a battery is not affected by temperature.
Question 12 of 100
Deterioration, or ageing, of a battery is dependent on:
Question 13 of 100
Stored lead-acid batteries self-discharge and may require freshening charges prior to installation if they remain in storage.
Question 14 of 100
Which of the following is not part the hierarchy of the components of a PV system as it is assembled?
Question 15 of 100
Which type of inverter produces synchronous ac power, regulates PV array battery charging, sends excess power to the grid and can operate during grid outages?
Question 16 of 100
A battery array is constructed of 144 series modules of 48 parallel LiCoO2 cells (18650s) with a system nominal voltage of 532 Vdc and system nominal capacity 124.8 AH. Calculate the nominal voltage of each cell.
Question 17 of 100
A battery array is constructed of 144 series modules of 48 parallel LiCoO2 cells (18650s) with a system nominal voltage of 532 Vdc and system nominal capacity 124.8 AH. Calculate the nominal capacity of each cell.
Question 18 of 100
As the internal resistance inside a battery increases, _______
Question 19 of 100
Equipment needed to conduct wet cell electrolyte testing includes:
Question 20 of 100
In most applications, direct current has a zero-amplitude crossing opportunity to quench the arc.
Question 21 of 100
In an ESS, the maximum current shall be the continuous inverter input current rating when the inverter is producing rated power at the _________ input voltage.
Question 22 of 100
What is the first thing that should be done in developing an MOP for an ESS retrofit?
Question 23 of 100
When removing batteries from an ESS, to minimize potential arc hazards one should:
Question 24 of 100
Prior to performing any work inside a battery enclosure, confirm _________
Question 25 of 100
When is it appropriate to perform individual voltage tests on a battery?
Question 26 of 100
IEE 1187-2013 states that if the manufacturer has not provided sufficient information one should:
Question 27 of 100
When assembling a battery rack, determining access requirements, and determining placement, one should always check:
Question 28 of 100
Seismic racks for batteries are required by:
Question 29 of 100
Which of the following should be utilized to determine the PPE required for a specific battery installation?
Question 30 of 100
AGM and lithium mounting racks are typically interchangeable
Question 31 of 100
Which of the following can be used to install batteries in racks or enclosures due their heavy weight?
Question 32 of 100
According to NEC 480.10 the minimum clearance between a battery terminal and the containment wall needs to be at least
Question 33 of 100
A good way to avoid short circuits when installing batteries is to:
Question 34 of 100
When lifting and moving large wet cell batteries, one should:
Question 35 of 100
When installing batteries in a rack, cells/batteries should be arranged so that the first and last (most positive and negative) batteries of a string are located on the same end of the rack.
Question 36 of 100
Four 6-volt lead-acid batteries are connected in series. They are rated at 2000 amps Isc. What is the short circuit current of the battery string?
Question 37 of 100
When cells are connected in a parallel circuit
Question 38 of 100
It is impossible to lock out voltage from the terminals of batteries other than by providing an insulation barrier.
Question 39 of 100
The risk of arc flash increases when batteries are installed in an enclosure.
Question 40 of 100
It is appropriate to grease nut/bolt hardware:
Question 41 of 100
What type of tools are required for all work on live battery components?
Question 42 of 100
Torqueing of battery connections is done to:
Question 43 of 100
Which type of connector is used in battery systems that exhibit thermal contraction and expansion, have the need for frequent battery replacement and exhibit limited work space?
Question 44 of 100
Flexible cable is often used in battery systems where
Question 45 of 100
As batteries are connected in series which of the following occurs?
Question 46 of 100
Which of the following can greatly degrade the health of an entire ESS?
Question 47 of 100
Calculations for conductor sizing show termination limitations require 2/0 AWG and conditions of use ampacity require 3/0 AWG. Which value should be used to determine conductor size?
Question 48 of 100
When a fused disconnect is utilized, the line terminals of the disconnecting means shall be
Question 49 of 100
The electric arc in a double-break contact system can continue to burn after an OCPD is tripped if the dc voltage wasn’t considered accurately.
Question 50 of 100
Both Ethernet and RS 485 wiring can be used in a BMS.
Question 51 of 100
In ESM systems, fiber optics are often used to
Question 52 of 100
A challenge with microgrid control installation is that they typically utilize
Question 53 of 100
A 24-volt Pb VRLA battery string is positively grounded. What conductor will the disconnect break?
Question 54 of 100
Which of the following is necessary for safe electrical installations?
Question 55 of 100
A conductive body extending the ground connection ________
Question 56 of 100
What is the maximum circuit ampere value which doesn’t require system grounding for a dc system per 2020 NEC 250.162(A)?
Question 57 of 100
The NEC states that dc systems
Question 58 of 100
A grounding electrode conductor (GEC) for a dc system shall be continuous.
Question 59 of 100
What is the full-form of CAN Bus?
Question 60 of 100
Out of the following options, which one is not a part of BMS systems and controls
Question 61 of 100
Protecting batteries installed in a series string by a BMS is harder because cell voltages do not always divide equally among the string, causing SOCs to vary.
Question 62 of 100
Site controllers can be PC or PLC based
Question 63 of 100
Identify the over-current protection devices from the following options:
Question 64 of 100
Spill containment, neutralizing and disposal is governed by which of the following?
Question 65 of 100
Which of the following covers direct current microgrids?
Question 66 of 100
The controls for an Energy Management System are capable of:
Question 67 of 100
Recommended practice for maintaining ESS can be found in:
Question 68 of 100
Which of the following causes electrolyte leakage in a Li-ion battery?
Question 69 of 100
Li-ion battery “don’ts” include:
Question 70 of 100
When planning ahead for locating and installing a battery rack one could install the following in case of electrolyte leakage or spills:
Question 71 of 100
Batteries present risks due to chemical and physical hazards in addition to electrical hazards.
Question 72 of 100
Which of the following is the most common cause of formation of gas bubbles in a lead acid battery?
Question 73 of 100
Excessive charge and discharge rates to Li-ion batteries may cause
Question 74 of 100
Which of the following present a fire risk from a Li-ion battery?
Question 75 of 100
Battery acid is highly flammable:
Question 76 of 100
Lithium chemistry is susceptible to thermal runaway from:
Question 77 of 100
When working on lead-acid batteries or with acids, which of the following is needed according to OSHA 1926?
Question 78 of 100
One should never work on installing vented lead-acid batteries unless an eye wash station or kit is in proximity.
Question 79 of 100
Common PPE to protect against chemical hazards presented by batteries does not include:
Question 80 of 100
Chemical PPE is not required when performing activities that do not involve handling electrolyte such as:
Question 81 of 100
Adding a circuit breaker to a battery energy storage system is justified energized work.
Question 82 of 100
Category 3 PPE for arc flash and shock risk includes clothing with a minimum incident energy rating of:
Question 83 of 100
You are performing maintenance on a single cell in an open rack. The array is 220Vnom with a bolted fault current of 2.3kA, what arc-flash category PPE should you wear?
For large spills of concentrated sulfuric acid what may be required before a neutralizing agent is introduced?
Question 86 of 100
In case of sulfuric acid contact with clothing or material one should _______.
Question 87 of 100
When performing a job hazard analysis which of the following is not an engineering controls issue?
Question 88 of 100
NFPA 70E, Article 320 states that electrical safety requirements for practical safeguarding employees while working with exposed stationary storage must be applied when direct current voltage exceeds:
Question 89 of 100
NFPA 70E, Article 320 states that tools and equipment shall be:
Question 90 of 100
Exposure to current above ______ can be life threatening.
Question 91 of 100
_______ is defined as a combination of the likelihood of occurrence of injury or damage to health and the severity of injury or damage to health that results from a hazard.
Question 92 of 100
NFPA 70E Section 110.4 Energized Work states that work on an energized system can be justified if the voltage is less than ______ if capacity of source and OCPD plus exposure to arc flash are considered and there is no increased exposures to burns or explosions.
Question 93 of 100
At what voltage is arc flash PPE required for work on direct current systems?
Question 94 of 100
Article 130.2(C) states that Exemptions to Work Permits can be given to qualified persons following ESWP and PPE:
Question 95 of 100
In order to perform a shock risk assessment, one needs to _______.
Question 96 of 100
Article 130 Work Involving Electrical Hazards allows exemptions to energized work permits for qualified persons:
Question 97 of 100
A work plan should be created to minimize the amount of work that is done requiring PPE.
Question 98 of 100
In addition to information listed in Tables provided by industry codes and standards, as well as manufacturers’ recommendations, hazard identification such as ___________ is important in identifying arc flash and arc fault risk.
Question 99 of 100
When an arc flash hazard exists, a risk assessment must be performed to determine:
Question 100 of 100
In a completed system undergoing troubleshooting, which conductor should be removed first if possible and not required for electrical testing?
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