ESAMTAC Student Final Examination v.5

Which of the following does a microgrid not do?

Which type of microgrid is connected to a traditional utility, capable of operating in island mode, and has multiple generators and sophisticated controls?

Microgrids are considered sustainable when their energy sources are renewable.

When installing a combined heat and power (CHP) microturbine

The components of a typical fuel cell include an anode, cathode, and an electrolyte membrane.

Other sources of electrical generation technologies for microgrids include

An ESS is commonly referred to in what units?

Which of the following is the most common voltage for batteries comprising a small UPS energy storage system?

Battery specifications typically include:

Batteries are rated according to?

Which of the following best describes a 0.5 C-rate (or C/2) during a discharge?

Which of the following are alternate types of energy storage?

To dispose of batteries properly, contacting the manufacturer is an appropriate first step.

In a PV system which is grid connected, which of the following is not necessary for supplying electricity to the utility company?

A microinverter typically connects to

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.

An battery array is constructed of 144 series modules of 48 parallel LiCoO₂ cells (18650s) with system nominal voltage of 532 Vdc and system nominal capacity of 124.8 AH. Calculate the current delivered at a 2C rate.

The ratio of the density of electrolyte to the density of water is specific gravity which correlates to:

The battery output conductors are always terminated to the battery before the disconnect.

DC disconnect switches, both fusible and non-fusible, share similar traits with ______ across all voltage ranges.

Thermal protection in a circuit breaker protects against short circuits and faults, which are drastically larger than overload.

What is the final step prior to opening or entering ESS equipment?

Single batteries, no longer in strings, do not have to be discharged to a recommended shipping voltage or SOC prior to removal and packing for disposal.

An unapproved lubricant used when sliding batteries onto racks could deteriorate the battery enclosures causing them to eventually leak.

Acceptance testing procedures for batteries includes:

IEE 1187-2013 states that if the manufacturer has not provided sufficient information one should:

If you have questions concerning the overall installation of batteries, you should:

Li-ion batteries present racking risks because of

What is required by OSHA 29 CFR 1910.151(c) if any person is exposed to injurious corrosive materials?

Spill containment is dictated by

One should never lift or move a battery by its

Which of the following are concerns that need to be addressed when staging batteries on a job site?

Active ventilation is required for all batteries that may release gas.

One should not work from top to bottom when there is a tipping hazard:

This image is an example of a:

A lithium-ion battery has a 1C rated capacity of 128ah, what is a likely capacity at a 2C-rate?

IEEE installation procedures state that as cells are installed one should:

It is impossible to lock out voltage from the terminals of batteries other than by providing an insulation barrier.

The parallel connection of batteries or battery segments greatly increases the potential of short-circuit current and may change the PPE category and arc-flash boundary.

Which of the following are common connectors recommended by battery manufacturers?

A common corrosion inhibitor used for battery terminals is:

When making battery connections, _____________ could be the result of over-torque.

Which finely stranded cable has 19 strands of cable in sizes 18 AWG to 2 AWG, 37 strands of cable in sizes 1 AWG to 4/0 AWG, and 61 strands of cable in sizes 250 kcmil to 500 kcmil?

Fine stranded cables are terminated with

Voltage drop in dc systems is a __________.

The series connections of battery modules require an increase in conductor size.

2020 NEC 706.31 Overcurrent Protection states that overcurrent protection devices, either fuses or circuits breakers, used in any dc portion of an ESS shall have the appropriate voltage, current and interrupting ratings for the application.

The ampacity of the feeder circuit conductors from the ESS to the wiring system, serving the loads to be serviced by the system, shall not be less than the greater of the:

Cable insulation properties and applications are covered in NEC [2017] Table 310.104(A), and/or NEC [2020] Table 310.4(A).

The best shield to prevent interference in a BMS is

Ethernet cabling must be terminated in a specific pair order

What has a practical working limit of 100m?

In an ungrounded (floating) PV system, which conductor(s) is (are) switched when disconnected?

Grounding is done to limit hazardous ______ exposure.

Which of the following can be used to create a bond?

Section 250.4(B) Ungrounded Systems, of the NEC covers

When a dc system is on the premises, where can the grounding electrode conductor be located?

DC systems must be ________

Out of the following options, which one is not a part of BMS systems and controls

Common types of manufacturers specifications for control and communication wiring include

A BMS balances batteries by removing charge from the most-full cells to leave room for charging or adding resistances so the others can catch up.

Modbus RTU serial cabling typically requires what at the end of the line?

Which of the following governs ESS electrical safety, emergency shutoff, workspace, electrical connections/installation on the customer side of the meter?

Safe energy storage equipment, installations, and systems pertain to:

NFPA 70, Article 710 states that all ESS equipment shall be listed and labeled or field labeled for its intended use.

Energy Management Systems are designed so that they can override any alternate power sources for fire pumps, health care facilities, emergency systems, legally required standby systems and critical operations power systems.

Cables used in ESS systems installed in buildings must comply with NEC classifications

Li-ion batteries may create thermal injury hazards caused by overheating.

What are the causes for internal short circuiting in Lithium-ion battery?

The general inspection of batteries and the location of installation should address:

Which of the following is an electrical hazard associated with battery energy storage systems?

Which of the following batteries requires rewatering?

Applying charge to an over-discharged Li-ion battery can result in overheating and fire.

Thermal runaway is a common concern for

The safety diamond represents:

It is safe to charge a lithium battery without a high voltage cutoff.

Splash proof goggles are required when working with electrolyte while wearing a face shield

Which of the following PPE should be used when placing wet cell batteries in racks?

Rain gear can be used to protect from chemical spills without being evaluated per ASTM1296

Vaporized lead exposure is a chemical hazard when working in a battery room.

Which of the following is not listed as Category 1 PPE for arc flash and shock risk?

NFPA 70E Table 130.7(C)15(b) “Arc-Flash PPE Categories for Direct Current (dc) Systems” cannot be used for systems with voltages greater than:

2021 70E Table 130.5(C)

2021 70E Table 130.7(C)(15)(b)

You are taking a current reading on a 48Vnom UPS system on an intercell connector, what arc-flash category PPE should you wear?

2021 70E Table 130.5(C)

2021 70E Table 130.7(C)(15)(b)

The determination of short circuit current is necessary in order to use Table 130.7(C)(15)(b) of NFPA 70E.  The arcing current is calculated at ___% of the dc short-circuit value.

2021 70E Table 130.5(C)

2021 70E Table 130.7(C)(15)(b)

A neutralizing agent, rubber gloves and containment bag are part of a _________.

A field-expedient neutralizing agent is ______.

What type of hazard is created when two workers remove damaged Li-ion modules from a system?

NFPA 70E, Article 320 states that it is ok to wear metal jewelry such as a watch or ring as long as it is covered by insulated rubber or leather gloves.

NFPA 70E 110.6(A)(1) states that employees do not have to be trained on an appropriate test instrument to verify the absence of voltage if a battery energy storage system is locked out and tagged out.

Article 130.5 states that it is acceptable to use the results of an incident energy analysis to specify the Arc Flash PPE Category from Table 130.7(C)(16).

NFPA 70E 110.6(A)(1) Qualified Person states that in addition to Article 110 general requirements for ESRWP workers shall also be familiar with:

Which of the following is not determined by a shock risk assessment performed for an energized electrical work permit?

According to NFPA 70E Section 110.4 Energized Work, additional hazards or increased risks include:

Moveable or fixed conductors and circuit parts changes the _________ boundary, but not the ________ boundary.

The restricted approach boundary (RAB) for dc exposure at 480 volts is:

NEC 480.7(C) states that battery circuits, where exceeding ________ nominal between conductors and ground, shall have provisions to disconnect the series-strings into segments.

Non-insulated (standard) tools can be used on segmented battery arrays.

According to Article 110.4(C) work on equipment operating at less than 50-volts does not need to be de-energized if it is determined there is no additional increased exposure to electrical burns or explosion due to electric arcs.

If a dc feeder between a battery array and disconnect needs to be removed, what end should be removed first?

What typically has a greater fault current?