Question 1

What is ventricular fibrillation?

Accepted Answer

A)  a heart murmur 
B)  the result of an electrical shock that stops a heart from beating 
C)  a medical tool designed to reactivate a heart that has stopped beating 
D)  the consequence of an electrical short circuit 
A)  a heart murmur 
B)  the result of an electrical shock that stops a heart from beating 
C)  a medical tool designed to reactivate a heart that has stopped beating 
D)  the consequence of an electrical short circuit B

Question 2

What is the most common root cause of a thermal runaway event in a li-ion battery?

Accepted Answer

A)  deficit of electrolyte in a cell 
B)  exposure to external high temperatures 
C)  breakdown of the battery bank cooling system 
D)  manufacturing defect in the cell chemistry of a single cell 
A)  deficit of electrolyte in a cell 
B)  exposure to external high temperatures 
C)  breakdown of the battery bank cooling system 
D)  manufacturing defect in the cell chemistry of a single cell D

Question 3

When a person is electrocuted, which of the following best describes his/her physical condition?

Accepted Answer

A)  The person has received an electric shock. 
B)  The person has been injured by an electric shock. 
C)  The person is dead. 
D)  All of the above. 
A)  The person has received an electric shock. 
B)  The person has been injured by an electric shock. 
C)  The person is dead. 
D)  All of the above. C

Question 4

Which of the following is the best reason to always wear CAT III PPE when working on HV vehicle systems even after the electrical circuits have been tested to be neutral?

Accepted Answer

A)  Lighting might strike the vehicle 
B)  Distributed capacitance 
C)  A thermal runway event could occur 
D)  It impresses supervisors 
A)  Lighting might strike the vehicle 
B)  Distributed capacitance 
C)  A thermal runway event could occur 
D)  It impresses supervisors

Question 5

What does the acronym AED spell out to in the context of a shop repairing HV vehicles?

Accepted Answer

A)  Automated external defibrillator 
B)  Alternating current discharge 
C)  Accidental electrical discharge 
D)  Automatic eddy dissipation 
A)  Automated external defibrillator 
B)  Alternating current discharge 
C)  Accidental electrical discharge 
D)  Automatic eddy dissipation

Question 6

What does the NEC consider to be the upper safe limit of electrical current that the average human body can sustain?

Accepted Answer

A)  50 mA 
B)  10mA 
C)  5mA 
D)  2mA 
A)  50 mA 
B)  10mA 
C)  5mA 
D)  2mA

Question 7

Technician A uses shop air pressure regulated at 75 psi (500 kPa) to clean HV battery packs. Technician B cleans li-ion battery banks using a power washer but makes sure the wand is not brought closer than 6 feet (2 meters) from the orange bank terminals. Who is correct?

Accepted Answer

A)  Technician A Only 
B)  Technician B Only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A Only 
B)  Technician B Only 
C)  Both A and B 
D)  Neither A nor B

Question 8

When working on HV vehicle electrical systems what minimum category of tooling and PPE protection gear should be used?

Accepted Answer

A)  CAT I 
B)  CAT II 
C)  CAT III 
D)  CAT IV 
A)  CAT I 
B)  CAT II 
C)  CAT III 
D)  CAT IV

Question 9

What CAT designation is applied to grid electrical voltages?

Accepted Answer

A)  CAT I 
B)  CAT II 
C)  CAT III 
D)  CAT IV 
A)  CAT I 
B)  CAT II 
C)  CAT III 
D)  CAT IV

Question 10

Which of the following is the appropriate hand protection when working with HV circuits?

Accepted Answer

A)  Class E rated gloves. 
B)  Class 0 rated gloves. 
C)  Corrosive-protected rubber gloves. 
D)  Uncured cowhide welding gloves. 
A)  Class E rated gloves. 
B)  Class 0 rated gloves. 
C)  Corrosive-protected rubber gloves. 
D)  Uncured cowhide welding gloves.

Question 11

Which of the following voltage values is generally considered to fall under the definition of a high voltage circuit?

Accepted Answer

A)  600 volts or higher 
B)  110 volts or higher 
C)  50 volts or higher 
D)  12.6 volts or higher 
A)  600 volts or higher 
B)  110 volts or higher 
C)  50 volts or higher 
D)  12.6 volts or higher

Question 12

What is said to be responsible for most deaths by electricity in the United States?

Accepted Answer

A)  Lightning strikes 
B)  Workers trained in electricity, short-cutting basic safety procedures 
C)  House owners undertaking repairs on electrical equipment 
D)  Service technicians not wearing appropriate footwear 
A)  Lightning strikes 
B)  Workers trained in electricity, short-cutting basic safety procedures 
C)  House owners undertaking repairs on electrical equipment 
D)  Service technicians not wearing appropriate footwear

Question 13

When working on HV circuits, what is the reason for working one-handed and keeping one hand in a pocket behind your back?

Accepted Answer

A)  The back pocket of a pair of coveralls is a good ground point. 
B)  In the event of a HV shock, it minimizes the chance of the current passing through the heart. 
C)  The spare hand can be used to grab an iron safety rail in the event of an electric shock. 
D)  If one hand gets burned off, you'll still have one good hanD. 
A)  The back pocket of a pair of coveralls is a good ground point. 
B)  In the event of a HV shock, it minimizes the chance of the current passing through the heart. 
C)  The spare hand can be used to grab an iron safety rail in the event of an electric shock. 
D)  If one hand gets burned off, you'll still have one good hanD.

Question 14

Technician A says that it is safe to hose down LV batteries using a steam washer. Technician B says that it is safe to clean LV batteries with a power washer providing the wand nozzle remains at least 6 feet (2 meters) away from the batteries. Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 15

What CAT designation does a household refrigerator cleaner fall under?

Accepted Answer

A)  CAT I 
B)  CAT II 
C)  CAT III 
D)  CAT IV 
A)  CAT I 
B)  CAT II 
C)  CAT III 
D)  CAT IV

Question 16

How does the CEV battery management system (BMS) respond when it detects an overheated li-ion cell?

Accepted Answer

A)  Increases coolant flow around the cell jacket 
B)  Shorts out the overheating cell 
C)  Deletes the overheating cell 
D)  Rests the overheating cell 
A)  Increases coolant flow around the cell jacket 
B)  Shorts out the overheating cell 
C)  Deletes the overheating cell 
D)  Rests the overheating cell

Question 17

For what purpose is an AED used?

Accepted Answer

A)  energizing a dead battery cell 
B)  heart bypass surgery 
C)  heart defibrillation 
D)  heart fibrillation 
A)  energizing a dead battery cell 
B)  heart bypass surgery 
C)  heart defibrillation 
D)  heart fibrillation

Question 18

When selecting a wrench to work on an HV electrical component, which of the following specifications should be correct?

Accepted Answer

A)  Insulated, and CAT III rated 
B)  Insulated, and UL certified 
C)  ASTM certified 
D)  OSHA certified 
A)  Insulated, and CAT III rated 
B)  Insulated, and UL certified 
C)  ASTM certified 
D)  OSHA certified

Question 19

Technician A says that arc blast can be deadly because it releases massive amounts of electrical energy that can vaporize metals. Technician B says that an arc flash event is relatively harmless because electrical energy is released mainly as light. Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Question 20

Technician A says that a hydrogen fuel cell powertrain contains HV circuits. Technician B says that a hybrid electric powertrain contains HV circuits. Who is correct?

Accepted Answer

A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B 
A)  Technician A only 
B)  Technician B only 
C)  Both A and B 
D)  Neither A nor B

Exam 39: High Voltage Electricity

What is ventricular fibrillation?

What is the most common root cause of a thermal runaway event in a li-ion battery?

When a person is electrocuted, which of the following best describes his/her physical condition?

Which of the following is the best reason to always wear CAT III PPE when working on HV vehicle systems even after the electrical circuits have been tested to be neutral?

What does the acronym AED spell out to in the context of a shop repairing HV vehicles?

What does the NEC consider to be the upper safe limit of electrical current that the average human body can sustain?

Technician A uses shop air pressure regulated at 75 psi (500 kPa) to clean HV battery packs. Technician B cleans li-ion battery banks using a power washer but makes sure the wand is not brought closer than 6 feet (2 meters) from the orange bank terminals. Who is correct?

When working on HV vehicle electrical systems what minimum category of tooling and PPE protection gear should be used?

What CAT designation is applied to grid electrical voltages?

Which of the following is the appropriate hand protection when working with HV circuits?

Which of the following voltage values is generally considered to fall under the definition of a high voltage circuit?

What is said to be responsible for most deaths by electricity in the United States?

When working on HV circuits, what is the reason for working one-handed and keeping one hand in a pocket behind your back?

Technician A says that it is safe to hose down LV batteries using a steam washer. Technician B says that it is safe to clean LV batteries with a power washer providing the wand nozzle remains at least 6 feet (2 meters) away from the batteries. Who is correct?

What CAT designation does a household refrigerator cleaner fall under?

How does the CEV battery management system (BMS) respond when it detects an overheated li-ion cell?

For what purpose is an AED used?

When selecting a wrench to work on an HV electrical component, which of the following specifications should be correct?

Technician A says that arc blast can be deadly because it releases massive amounts of electrical energy that can vaporize metals. Technician B says that an arc flash event is relatively harmless because electrical energy is released mainly as light. Who is correct?

Technician A says that a hydrogen fuel cell powertrain contains HV circuits. Technician B says that a hybrid electric powertrain contains HV circuits. Who is correct?

Introduction

Hand and Shop Tools, Precision Tools, and Units of Measurement

Personal and Safety Awareness

Engine Basics

History of the Heat Engine

Power

Engine Powertrain Components

Engine Feedback Assembly

Engine Housing Components

Engine Lubrication Systems

Engine Cooling Systems

Engine Breathing

Engine Retarders

Servicing and Maintenance

Engine Removal, Disassembly, Cleaning,

Diesel Engine Run- in and Performance Testing

Chemistry and Combustion

Diesel Fuel Characteristics

Fuel Subsystems

Fuel Injection Basics and Governor Principles

Injector Nozzles

Port-Helix Metering Injection Pumps

Inlet-Metering Rotary Distributor Pumps

Sleeve-Metering Rotary Distributor Pumps

Single-Actuator Eui Systems

Dual-Actuator Eui Systems

Heui Fuel Systems

Electronic Unit Pump Eup Systems

Cummins Hpi-Tp

Common Rail Systems

Amplified Common Rail Systems

Review of Electrical and Electronics Fundamentals

Vehicle Computer Systems

Ests and Siss

Electrical Wiring, Connector Terminal Repair

Multiplexing

The Connected Vehicle

Natural Gas, Propane, and Biodiesel Fuels

Hybrid and Hydrogen Fuel Cell Drivetrains

Electric Powertrains

Bosch Edc Systems

Caterpillar Engine Management Systems

Cummins Management Systems

Detroit Diesel Electronic Controls Ddec

Navistar Diamond Logic

Paccar Engine Management Systems

Volvo and Mack Engine Management

Emissions Management

Servicing Maintenance of Exhaust Aftertreatment Systems

Failure Analysis

Troubleshooting and Diagnostics

Filters