ASE xEV (Level 2) Exam Questions

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101.

When performing an insulation test, which of the following is tested with the inner conductor?

  • Chassis ground

  • High-voltage battery

  • A/C compressor

  • Manual Service Disconnect (MSD)

Correct answer: Chassis ground

The inner conductor to chassis ground connection is tested. The measuring voltage should be between 500 V and 1,000 V.

Other steps for an insulation test include checking the shielding to the inner conductor, shielding to the chassis ground, and e-motor windings. 

102.

What does the second digit of the Ingress Protection (IP) rating mean?

  • Level of water protection

  • Level of dust protection

  • Price

  • Manufactured year

Correct answer: Level of water protection

The IP rating includes two digits. The first digit shows the size of excluded objects, offering dust protection, while the second digit reveals the level of water protection it provides.

A zero rating means there's no water protection, while an eight means it's protected from continuous immersion in one meter of water. 

103.

When should test tools be inspected?

  • Before every use

  • Once a week

  • Once a month

  • Once a day

Correct answer: Before every use

Test instruments and accessories must be inspected before every use. Any defective or damaged tool must be repaired and re-tested before using it. 

This guideline aligns with Article 110.4 of NFPA 70E (National Fire Protection Association), the Standard for Electrical Safety in the Workplace. 

104.

At what point is it safe to touch a person in contact with an electrical current?

  • Never

  • When you have a conductive stick to push them with

  • When standing on a rubber mat

  • Anytime 

Correct answer: Never

It's never safe to touch a person being shocked by an electrical current. By touching them, you could become part of the current.

Instead, you want to turn off the power at the source, whenever possible. You also want to call 911. Once the patient isn't being shocked, you can follow other first aid protocols, such as treating burns, performing CPR, and keeping the person from becoming too cold. 

105.

Before measuring the high-voltage system to see if current has been isolated, the technician must first do what?

  • Measure known fixed voltage

  • Touch the high-voltage cables

  • Begin maintenance and repairs

  • Drive the EV

Correct answer: Measure known fixed voltage

With the appropriate Personal Protective Equipment (PPE) on, the technician should always measure a known fixed voltage first. This can be done by using the digital multimeter on a low-voltage component, such as a 12- or 24-volt battery. It can also be done with a proving unit, if one is available. 

This simple test ensures that the digital meter is working as it should before using it to verify high-voltage status. 

106.

All of the following conditions indicate that the test leads or probes should be replaced, except:

  • Intact wires

  • Cut wires

  • Frayed wires

  • Broken wires

Correct answer: Intact wires

All test leads and probes should be checked before use. If an inspection shows that the wires are intact and in good condition, there's no need to replace them. 

If these parts reveal cut, frayed, or broken wires, it's important to replace the tool before using it again. 

107.

How is the xEV's high-voltage system related to the chassis ground?

  • Fully isolated

  • In series

  • In parallel

  • Not connected at all 

Correct answer: Fully isolated

The xEV's high-voltage system is fully isolated from the chassis ground. This condition is known as "floating."

Because of this relationship, multi-channel instruments are needed for the floating measurements. 

108.

When can the low-voltage battery of an xEV be re-connected?

  • Only after the high-voltage Manual Service Disconnect (MSD) or switch is returned to its original position

  • Before the high-voltage Manual Service Disconnect (MSD) or switch is returned to its original position

  • At any time

  • It shouldn't be disconnected

Correct answer: Only after the high-voltage Manual Service Disconnect (MSD) or switch is returned to its original position

The low-voltage battery can be re-connected after the high-voltage Manual Service Disconnect (MSD) or switch is returned to its original position. Any removed covers must also be reinstalled first.

These steps must be taken to finalize the work and are part of the planning and documentation that needs to be done. 

109.

What must be performed after de-energizing the system?

  • An absence of voltage test

  • A physical inspection

  • An inspection by a supervisor

  • Repairs and maintenance work as scheduled

Correct answer: An absence of voltage test

The absence of voltage test verifies that the system is de-energized. Until this test is performed, the technician must assume that the circuit is live. 

The absence of voltage test is part of planning and documenting the work that is done. 

110.

How should the threaded nut or bolt be torqued on a high-voltage connection?

  • To Original Equipment Manufacturer (OEM) specs

  • To supervisor's instructions

  • To generic specs

  • Until it's tight

Correct answer: To Original Equipment Manufacturer (OEM) specs

If a high-voltage connection contains a threaded nut or bolt, it must be torqued to the OEM specifications. Do not over-torque the nut or bolt because damage could occur.

Generic specs aren't sufficient and the supervisor shouldn't give any information against what the OEM recommends. 

111.

When can the xEV be powered back on?

  • After it's reassembled and the low-voltage battery is connected

  • After it's reassembled, but before the low-voltage battery is connected

  • Any time during the process of repair and maintenance

  • Before it's reassembled, but after the low-voltage battery is connected

Correct answer: After it's reassembled and the low-voltage battery is connected

The xEV can be powered back on once it's been reassembled and the low-voltage battery is connected. After turning it on, the vehicle should be checked for codes.

Some vehicles will set codes because the system has been shut down. 

112.

What arc faults are xEV systems subject to?

  • Both series and parallel

  • Series

  • Parallel

  • None

Correct answer: Both series and parallel

EV systems are subject to series arc faults caused by disruption in continuity of the conductor. They are also prone to parallel arc faults from the unintended current between the two conductors. These parallel arc faults are usually caused by a ground fault. 

Arc flash is a known hazard of EV batteries, especially after they have been damaged or are deemed defective. 

113.

What does CPR stand for?

  • Cardiopulmonary Resuscitation

  • Cardiac Pulse Restoration

  • Cardio Pushing Resting 

  • Cardiac Pumping Response

Correct answer: Cardiopulmonary Resuscitation

CPR stands for Cardiopulmonary Resuscitation. This emergency procedure helps keep the blood flowing in a victim when the blood stops. 

By performing immediate CPR, the victim's chances of survival double or triple. CPR can be performed as a hands-only procedure, or mouth-to-mouth can be included. 

114.

Along with the CAT rating on the front of a multimeter, what other symbol should a technician look for?

  • Double insulated

  • Made in the USA

  • Waterproof

  • Windproof

Correct answer: Double insulated 

All digital multimeters should contain a double insulated symbol on the back of the tool. This symbol indicates that it has the highest level of protection.

Technicians also need a CAT III 600 V, CAT III 1000 V, or CAT IV 600 V rated multimeter. This designation should be listed on the front of the meter. 

115.

What is the term to describe the uneven and uncoordinated pumping of the heart after an electrical shock?

  • Ventricular fibrillation

  • Muscle contraction

  • Nerve damage

  • Shock

Correct answer: Ventricular fibrillation

Ventricular fibrillation occurs when the heart pumps unevenly and uncoordinated after an electrical shock. This condition is a threat with electrical shock between 17–99 mA.

At this same time, muscular contraction and nerve damage are likely. Death is also probable. 

116.

Why is only one hand allowed to touch the lead, vehicle, or ground while working with live circuits?

  • It prevents the technician from contacting a circuit

  • To prevent a fire

  • To make repairs more difficult

  • It's standard protocol for most employers

Correct answer: It prevents the technician from contacting a circuit

If the technician only uses one hand while working with live circuits, they prevent having electricity running through their body if isolation is lost. Technicians should only use a single hand to touch the lead, ground, or vehicle during this time.

This rule should also be followed when wearing the appropriate Personal Protective Equipment (PPE). 

117.

Which of the following may employees need to be protected from when working on xEVs?

  • Arc-flash burns

  • Flooding

  • Natural disasters

  • Respiratory illnesses

Correct answer: Arc-flash burns

Employees need to be safeguarded against arc-flash burns with the appropriate shields, barriers, and insulating material. They must also be protected against electric shock and blasts.

xEVs won't cause flooding to occur, as the major threats include those related to electrical current. 

118.

Who is permitted to lockout or tagout components?

  • Technician working on the vehicle

  • All technicians

  • Supervisor

  • Customer

Correct answer: Technician working on the vehicle

Only the technician performing the maintenance or repair is qualified to lockout or tagout the components. These components must be secured and attributed to this technician.

It's not permitted to have another technician handle these components, as there's the threat of them being re-energized when they shouldn't be. 

119.

At what voltage can electrocution be fatal?

  • 30 volts

  • 25 volts

  • 20 volts

  • 40 volts

Correct answer: 30 volts

Electrocution becomes deadly at as little as 30 volts. Any voltage greater than 30 volts AC rms and 60 volts DC is considered dangerous.

Electric vehicles produce this level of voltage, and are considered dangerous to work around or on without proper precautions. 

120.

Prior to the start of CPR, what should be done?

  • Call 911

  • Verify electric source is active

  • Head count taken of employees

  • EV should be moved out of bay

Correct answer: Call 911

If an emergency event has occurred, 911 should be called first. CPR can be started after 911 is called, and performed at the direction of the operator.

By starting CPR, you give the victim a better chance of survival when the emergency responders arrive.