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Quiz Session - Attempts With Random Questions

ASE xEV (Level 2) Exam Questions

Page 8 of 10

141.

Why are fuses, relays, and the Manual Service Disconnect (MSD) placed in a secured location?

  • To prevent accidental reinstallation

  • To add more work to the technician

  • So no one steals them

  • Because they are energized

Correct answer: To prevent accidental reinstallation

Technicians are responsible for securing fuses, relays, and the Manual Service Disconnect (MSD) in a locked location to prevent accidental reinstallation. If another person takes these items and reinstalls them, it could lead to electrical shock and fire danger.

Lockout is only needed in an uncontrolled environment. If the environment is controlled and there is an established group policy, tagout can be used instead. 

142.

What is the most likely hazard when working around Electrified Propulsion Vehicles (xEVs)?

  • Electrical shock

  • Fire

  • Arc flashes

  • Arc blasts

Correct answer: Electrical shock

Electrical shock is the most likely hazard when working on or around Electrified Propulsion Vehicles (xEVs). Electrocution at levels as low as 30 volts can lead to death. 

Fire is also a risk, as well as arc flashes and arc blasts. High-voltage batteries are dangerous to work around without proper training.

143.

What Class is recommended for a rubber insulating mat when working around xEVs?

  • Class 0

  • Class 1

  • Class 2

  • Class 3

Correct answer: Class 0

The Class 0 mats are recommended for technicians working around xEVs to prevent deadly shocks. These mats are flame retardant, oil and acid resistant, and tested to 5 kV for up to 1,000 V maximum working voltage.

These rubber insulating mats also have high dielectric strength. 

144.

Which of the following tasks cannot be performed by a Level 2 technician?

  • Diagnose issues with the high-voltage battery

  • Isolate voltage from the system

  • Secure the high-voltage system so it can't be activated

  • Perform general work on de-energized high-voltage components

Correct answer: Diagnose issues with the high-voltage battery

Only a Level 3 technician is qualified to diagnose or repair issues with the high-voltage battery. The Level 2 technician is qualified to evaluate the condition of the high-voltage electrical system and isolate the voltage.

Level 2 technicians can also secure the high-voltage system to ensure it doesn't get activated, and restart the system. These technicians perform general work on de-energized components and understand the risks of working with a high-voltage system. 

145.

Why is it vital to properly torque a threaded nut or bolt on a high-voltage connection to the Original Equipment Manufacturer (OEM) specs?

  • Proper torque provides resistance to corrosion

  • Because all xEVs are the same

  • To please the supervisor

  • So it doesn't get lost

Correct answer: Proper torque provides resistance to corrosion

Resistance to corrosion is dependent upon the threaded nut or bolt being torqued to OEM specifications. The cleanliness and quality of the electrical connection also relies on this torque.

It's important to never over-torque a threaded nut or bolt. 

146.

What can occur when power is removed to a charged inductor?

  • High-voltage transient or spike

  • Nothing

  • Reduced voltage

  • Power short

Correct answer: High-voltage transient or spike

It's possible for a high-voltage transient or spike to occur when power is removed to a charged inductor. The inductor attempts to maintain the current that was flowing, causing induced voltage, in the opposite direction to the current. 

Transients are also known as counter Electomotive Force (EMF). They are possible when working with xEV motors, capacitors, and coils. The spike is narrow, usually less than 100 mS, but it can reach up to thousands of volts. 

147.

At what point can the technician assume the circuit is no longer live?

  • After an absence of voltage test

  • After de-energizing the system

  • Once a supervisor checks

  • Never

Correct answer: After an absence of voltage test

An absence of voltage test should always be performed. After that is complete, the technician can assume the circuit is no longer live.

Technicians must assume the circuit is still live, even after de-energization.

148.

The severity of shock increases with what factor?

  • Higher current flow

  • Lower current flow

  • Higher ambient temperatures

  • Lower voltage

Correct answer: Higher current flow

The higher the flow of current is, the more severe the damage becomes. It's also important to consider what type of current it was (AC or DC). 

Intensity is another concern, because it isn't the voltage that causes the shock, but the current. 

149.

As part of de-energizing circuits, the technician should ensure the work environment offers all but which option?

  • Dimmed lights

  • Clean area

  • Dry area

  • Safe, non-conductive materials

Correct answer: Dimmed lights

When de-energizing circuits, the technician needs a safe work environment. To start, there must be plenty of lighting, so the technician can see what's being worked on.

In addition to adequate lighting, the area should be dry and clean. 

150.

What does the warning light with a turtle mean?

  • Limited power

  • Slow mode

  • Reduce speed

  • Proceed with caution

Correct answer: Limited power

A turtle dashboard warning light means that the EV has limited power. The warning light may be either red or amber-colored.

It could indicate a fault that prevents the vehicle from being responsive. This warning may signal a serious fault, so it needs to be looked at immediately. 

151.

Technician A says that current through the interlock circuits creates a voltage drop across computer monitoring circuits. Technician B says that current through these circuits creates a voltage increase. Which technician is correct?

  • Technician A

  • Technician B

  • Neither

  • Both

Correct answer: Technician A

When the connectors are fully seated and switches are closed, the current runs through the interlock circuits. This current drops the voltage across computer monitoring circuits because it is connected to a low-voltage power source.

Once any connector of the interlock circuit is removed, the circuit opens back up.

152.

What is the name of the electrical current that causes the muscles to lock up, making the person unable to release grip from the source?

  • Let-go

  • Shocker

  • Stuck-on

  • Stuck current

Correct answer: Let-go

The let-go threshold defines the current that is strong enough to force severe muscle contractions. With these contractions, the person being shocked won't be able to release their grip on the electrical source, causing them to remain part of the current. 

The let-go threshold can occur at as little as 6 milliamps (mA). Ideally, power would be cut to the source to stop the person from being shocked. 

153.

What could introduce a path for moisture intrusion?

  • Back-probing high-voltage connectors

  • Using a multimeter

  • Removing the Manual Service Disconnect (MSD)

  • Using insulated hand tools

Correct answer: Back-probing high-voltage connectors

Technicians should never back-probe high-voltage connectors. This practice introduces a path for moisture intrusion. 

It's also essential that no sprays are used around the high-voltage circuits. 

154.

What is one quality of an insulated hand tool?

  • Completely dielectric up to 1,000 V AC

  • Completely dielectric up to 500 V AC

  • Resistant to voltage

  • Completely dielectric up to 2,000 V AC

Correct answer: Completely dielectric up to 1,000 V AC

The insulated hand tool is required to be completely dielectric up to 1,000 V AC. No part of the tool's insulation will conduct electricity as long as the voltage is below that level.

These requirements are set forth by the American Society for Testing and Materials (ASTM F1505-10).

155.

What tool(s) helps technicians determine the insulation condition on motor windings, generators, and wire?

  • Insulation tester

  • Digital multimeter

  • Insulated hand tools

  • Socket and wrench

Correct answer: Insulation tester

The insulation tester is designed to check the insulation condition on motor windings, generators, and wire. When a trouble code entry is set stating either "Insulation Resistance Too Low" or "Loss of Insulation," technicians should first disconnect high-voltage components.

After that, the insulation tester can be used to check isolation at the component level. 

156.

Technician A says that the xEV will have codes set after the system has been shut down. Technician B says that the xEV won't have any codes. Which technician is correct?

  • Both

  • Technician A

  • Technician B

  • Neither

Correct answer: Both

Some xEVs will have codes set in the computer when the system has been shut down or disturbed. There are also some that won't set any codes, so both technicians could be correct, depending on what vehicle is being worked on.

Technicians should check for codes after powering the xEV back on. 

157.

What item is pocket-sized and helps to verify the measurements from an electrical test tool?

  • Proving unit

  • Digital multimeter

  • Test light

  • Capacitance meter

Correct answer: Proving unit

The proving unit is portable and pocket-sized. It sources stable AC and DC voltage to test electrical measurement tools with.

This battery-powered device offers technicians a safe and reliable way to ensure that measurement tools are operating correctly before performing live tests. 

158.

Which of the following items can the technician leave on when working on xEVs?

  • Shoelaces

  • Jewelry

  • Belt buckles

  • Watches

Correct answer: Shoelaces

Shoelaces should be non-conductive and shouldn't need to be removed. Technicians are required to remove anything conductive on their person.

These items may include jewelry, belt buckles, watches and anything that may conduct electricity. It's also vital to remove anything metallic from one's pockets before starting work. 

159.

What must a Level 2 technician set up around the electrified work area?

  • Safety zone

  • Chairs 

  • Nothing

  • Conductive barriers

Correct answer: Safety zone

The Level 2 technician is responsible for setting up a safe zone around the electrified work area. Whenever high-voltage system repairs are left unattended, warning signs must alert others of the danger.

Additionally, removed parts must follow all of the guidelines for the Lockout/Tagout (LOTO) procedure.

160.

What level technician is permitted to separate individual battery modules?

  • Level 3

  • Level 2

  • Level 1

  • None

Correct answer: Level 3

The Level 3 technician can separate individual battery modules. They can also perform diagnostic and repair work.

Level 3 technicians can also perform all of the same tasks as the Level 2 and Level 1 technicians. 

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