AUTT 2200 Final exam study guide
Even a pin-sized puncture is enough to compromise the class 0 glove and allow voltage to enter the body. For this reason, the rubber part of class 0 gloves should be tested before every use and recertified every _________.
a. six months
Some vehicles are equipped with blue cables to carry the less high voltages that drive the accessories. This voltage is less than _________ but is still dangerous and must be isolated.
c. 50 volts
Two technicians are discussing 12-volt battery safety. Technician A says when disconnecting battery cables, always disconnect the positive cable first. Technician B says when connecting battery cables, always connect the negative (ground) cable last. Who is right?
c. B only
Technician A says a flash electrical injury can include hot metal spray. Technician B says a true electrical injury happens when a person becomes part of an electrical circuit. Who is correct?
c. Both A and B
Technician A says safety data sheets (SDS) explain employers' and employees' responsibilities regarding the handling and disposal of hazardous materials. Technician B says safety data sheets (SDS) contain specific information about hazardous materials. Who is correct?
c. Both A and B
Technician A says that AC current changes direction. Technician B says that a battery may be a DC power source. Who is right?
c. Both A and B
Technician A says that tailpipe emissions sometimes include hydrocarbons. Technician B says that crankcase emissions sometimes include hydrocarbons. Who is correct?
c. Both A and B
What is the minimum CAT rating a DVOM must have when servicing high-voltage systems?
c. CAT III
Latex gloves provide good hand protection; however, some people are allergic to latex. What type of gloves could be worn if latex causes a rash or redness?
c. Either nitrile or vinyl
What do we call the process of creating electricity with magnetism?
c. Induction
Two technicians are discussing the history of the automobile. Technician A says the first cars developed in the late 1800s used 4-cylinder 4-stroke engines. Technician B says these early cars made roughly 50 horsepower. Who is right?
c. Neither A nor B
Hybrid vehicles were some of the first to use ___________ refrigerant in their air conditioning systems.
c. R-1234yf
Which of the following is the least useful measurement when using a wiring diagram to diagnose a circuit fault?
c. Resistance
If voltage to a circuit is constant and the circuit's total resistance increases, what happens to the circuit's amperage?
c. The amperage goes down.
Which of the following is a characteristic of all parallel circuits?
c. The current through each leg is different if the resistance values are different.
Which of these is true about inverter service safety?
c. The inverter should be allowed to discharge after the system is isolated.
Which of the following is NOT a type of variable resistor?
c. Zener diode
When performing a cranking system test,
c. disable the ignition system
The process in which a conductor cuts across a magnetic field and produces a voltage is called ______________.
c. electromagnetism
One major defining characteristic of a modern hybrid vehicle is _____.
c. regenerative braking
Class 0 gloves are a special type of gloves designed to protect the wearer while working on high-voltage systems. They are comprised of two parts, consisting of _____.
c. rubber and leather
OBD 2 was mandated in ______________.
d. 1996
Onboard diagnostics 2 (OBD 2) was mandated for all road-legal vehicles in the United States in what year?
d. 1996
Ear plugs are suitable for providing about a _______ reduction in noise levels.
d. 30-decibel (dB)
Two technicians are discussing electromagnetism. Technician A says that the number of turns of wire around an iron core is directly proportional to the strength of the magnetic field. Technician B says that as the reluctance increases, the field strength will also increase. Who is right?
d. A only
In October 1973, what did the members of the Organization of Petroleum Exporting Countries (OPEC) impose on the world?
d. An oil embargo
Voltage drop is the primary measurement used when diagnosing electrical faults. Voltage drop will identify which characteristics of a circuit?
d. Available voltage, available ground, and unwanted circuit resistance
Which of the following is NOT an outcome when measuring voltage drop?
d. How much resistance is in the circuit
A manufacturer must issue recalls for safety concerns identified by the _____.
d. National Highway Traffic Safety Administration (NHTSA)
Two technicians are discussing service disconnect plug locations. Technician A says the Toyota Prius' plug is in the center console. Technician B says the Chevrolet Volt's service plug can be accessed from the trunk below the back seat. Who is right?
d. Neither A nor B
What color is the insulation on high-voltage circuits in an electric-drive vehicle?
d. Orange
What causes bulbs to glow dimly in a circuit?
d. Too little current flow
Which of the following is the specified method for testing the charging system on a vehicle that uses a DC-to-DC converter?
d. Turn on the blower motor and headlights and observe the voltage reading
The actions of the Organization of Petroleum Exporting Countries (OPEC) in 1973 resulted in all of these, EXCEPT:
d. higher crankcase emissions.
Parallel hybrids are also known as ______________ hybrids.
d. mild
High-voltage cables are typically much larger than any other cable on a vehicle and are identified by their _______ or blue casing.
d. orange
Electric vehicles are distinguished by all the following EXCEPT:
d. recharge time and range
The benefits of a hybrid vehicle include better fuel economy, which also results in reduced emissions and _____.
d. reduced operational costs
True or False: A locomotive hybrid is typically a series type.
a. True
True or False: E = IR is an expression of Ohm's law.
a. True
True or False: Full-face shields are designed to provide protection for the face, neck, and eyes of the technician.
a. True
True or False: Harmful auto emissions come primarily from three sources: crankcase gases, tailpipe emissions, and fuel vapors.
a. True
True or False: In a series circuit, circuit current is the same throughout the circuit.
a. True
True or false: A relay is an electro-mechanical switching device that allows a higher current circuit to be controlled by a lower current control.
a. True
True or false: Gasoline internal combustion engines (ICEs) were developed at the end of the era of external combustion steam engine cars.
a. True
True or false: Police and firefighters are trained to safely manage accidents involving HEV and EV vehicles.
a. True
True or false: The magnetic field generated by a coil of wire increases as the current through the coil increases.
a. True
Which of these statements is true about voltage and amperage?
a. Voltage is the difference in potential.
Many modern vehicles use ____________ to activate the parking brake. This is more common in hybrid electric vehicles and requires some special attention.
a. electric motors
Magnetic fields produce electricity through a process called ______________.
a. induction
All of these are true about voltage, EXCEPT:
a. it is the flow of electrical charges through a load.
With the large expansion of infrastructure, electric vehicles started to get left behind due to all the following EXCEPT:
a. people had no interest in electric cars
The main step when isolating a high-voltage circuit is to remove the _____________.
a. service disconnect plug
Long hair may pose a safety concern. If your hair is long enough to touch the bottom of your ________, it should be tied back.
a. shirt collar
In what year did the Toyota Prius become available worldwide?
a. 2000
Because hybrid electric vehicle (HEV) and battery electric vehicle (BEV) systems feature voltages in excess of __________, it is vital that the service technician observe all safety precautions.
a. 300 volts
Technician A says that high-voltage electrical circuits may be turned off by removing a service plug. Technician B says that high-voltage electrical circuits will be turned off by disconnecting the low-voltage battery. Who is right?
a. A only
Technician A says the right-to-know laws require employers to train employees regarding hazardous waste materials. Technician B says labeling of hazardous materials is not a provision in the right-to-know laws. Who is correct?
a. A only
Two technicians are discussing HV battery safety. Technician A says the most common repair performed on a high-voltage battery is simple replacement after failure. Technician B says it is uncommon in a repair shop to service the battery internally. Who is right?
a. A only
Two technicians are discussing ground circuits. Technician A says the ground cable is the return path for current in the circuit. Technician B says that a loose fastener at the ground cable will increase current flow in the circuit. Who is right?
a. A only
Two technicians are discussing hybrid vehicle types. Technician A says a series hybrid can mechanically disengage the ICE from the power train and operate the electric motors independently. Technician B says a series hybrid incorporates an electric motor that is always engaged with the ICE. Who is right?
a. A only
Two technicians are discussing the impact of automobiles on the environment. Technician A says that the EPA was formed in 1970. Technician B says that the EPA was formed in response to growing concerns about the impact of emissions and burning fossils fuels on air and water. Who is right?
a. Both A and B
The abbreviation EREV stands for what?
a. Extended range electric vehicle
In 2010, Nissan launched a vehicle capable of a range of around 100 miles on a single charge called the _____.
a. Leaf
The EGR Valve was introduced as a way to control the release of ______________.
a. NOx
How much lag time does the DC-to-DC converter have to compensate for loads on the 12V system?
a. No lag at all
What color is the insulation, connectors, and conduits on high-voltage electrical circuits?
a. Orange
The abbreviation OPEC stands for what?
a. Organization of Petroleum Exporting Countries
Which of the following is responsible for converting DC to AC voltage?
a. The inverter
Which of the following is NOT a characteristic of a series circuit?
a. Total circuit resistance lower than the lowest branch's resistance
William Morrison developed the first American electric car in what year?
b. 1890
Two technicians are discussing the components of hybrid and electric vehicles. Technician A says with the exception of the ICE, hybrid and fully electric vehicles share most of their components. Technician B says these vehicles do not require the use of a 12-volt battery to run the low-voltage systems. Who is right?
b. A only
Technician A says that DC power produces less heat than AC power does. Technician B says that AC power is preferred to power electric motors. Who is right?
b. B only
Technician A says that the total resistance of a parallel circuit is the sum of the resistors (R1 + R2 + R3...). Technician B says that the total resistance of a series circuit is the sum of the resistors (R1 + R2 + R3...). Who is right?
b. B only
Technician A states that gasoline internal combustion was the obvious choice for consumers in 1896. Technician B states that a lack of infrastructure leads to the failure of the electric car. Who is correct?
b. B only
Two technicians are discussing the Clean Air Act of 1970. Technician A says the act included limiting carbon dioxide emissions. Technician B says the act initiated a study of the effect vehicle emissions has on air and water. Who is correct?
b. B only
Technician A states that electrical current flow in a circuit is expressed as the amperage in a circuit. Technician B states that amperage must be measured in series with the load. Who is right?
b. Both A and B
Two technicians are discussing regenerative braking. Technician A says regenerative braking allows hybrid and electric vehicles to recharge their batteries during braking. Technician B says recapturing some of the kinetic energy during deceleration allows for better fuel economy and extended range. Who is right?
b. Both A and B
What is the preferred type of battery tester when testing an auxiliary battery on a hybrid or electric vehicle?
b. Conductance tester
Which of the following components switch the high-voltage power on out of the battery pack?
b. Contactor relays
What happens in a series circuit when its resistance increases and voltage remains constant?
b. Current decreases
True or False: Any time technicians step away from a vehicle, they should make sure that the high-voltage system has been restored before continuing with repairs.
b. False
True or False: Class 0 gloves should be replaced every six months.
b. False
True or False: Hybrid technology is a recent invention and has only ever been used in cars.
b. False
True or False: The strength of the magnetic poles in an electromagnet decreases with an increase in the number of turns of wire and the current flowing through them.
b. False
True or false: A 48-V system is considered a high-voltage system.
b. False
True or false: Automotive batteries provide alternating current to power the vehicle's electrical loads.
b. False
True or false: Diodes, transistors, and transformers are all types of semiconductors.
b. False
True or false: Like their low-voltage counterparts, high-voltage cables can use the chassis of the vehicle as a common ground.
b. False
True or false: Oxygen is the most abundant element in the universe.
b. False
True or false: The first step in any high-voltage system repair is to remove the ground cable from the 12-volt auxiliary battery and isolate the cable.
b. False
All of the following components are shared between a hybrid vehicle and an electric vehicle, EXCEPT:
b. ICE.
Which type of circuit has multiple branches for current to flow through?
b. Parallel circuit
Why do hybrid and electric vehicles need to use high-voltage systems?
b. To operate the electric motors and keep current levels low
Pneumatic tools are powered by ______________.
b. compressed air
Wearing insulated gloves ______________.
b. increases electrical resistance
Hybrid vehicles use a combination of
b. internal combustion engines and electric motors
All of the following are very simple steps that you can take to help assure safe hand tool use EXCEPT:
b. lay tool across the battery, as it is a nice flat area under the hood
By the 1960s, air quality in several U.S. cities was abysmal. Harmful emissions from automobiles—primarily crankcase gases, tailpipe emissions, and fuel vapors—were contributing to a new phenomenon known as _____.
b. photochemical smog
Each of the following is a type of diode EXCEPT:
b. semiconductor
