EL2-ASE-Style Review Questions

Battery terminal connections are being discussed. Technician A says when disconnecting battery cables, always disconnect the negative cable first. Technician B says when connecting battery cables, always connect the negative cable first. Who is correct?

• A only

• B only

• Both A and B

• Neither A nor B

A customer’s battery is always dead when she attempts to start her car in the morning. After jumping the battery one time in the morning, the car will start throughout the day with no problems. All of the following can be the cause EXCEPT:

• The starter motor is drawing too much current.

• The glove box light is staying on.

• A computer is not powering down.

• A relay contact is stuck closed.

The specific gravity of a battery has been tested. All cells have a corrected reading of about 1.200. Technician A says the battery needs to be recharged before further testing. Technician B says the battery is sulfated and needs to be replaced. Who is correct?

• A only

• B only

• Both A and B

• Neither A nor B

When charging a battery:

• Connect a voltmeter across the battery terminals while the battery is charging and keep the charge rate at fewer than 10 volts.

• Disconnect the negative battery cable before charging to prevent damage to the alternator and computers.

• Charge at an amperage rate of 50% of the CCA rating.

• All of the above.

Which statement concerning the battery leakage test is correct?

• The test is used to determine if the battery can provide current and voltage when loaded.

• A voltmeter reading of 0.05 when performing the test is acceptable.

• Both A and B.

• Neither A nor B.

The open circuit test is being discussed. Technician A says the battery must be stabilized before the open circuit voltage test is performed. Technician B says a test result of 12.4 volts is acceptable. Who is correct?

• A only

• B only

• Both A and B

• Neither A nor B

A maintenance-free battery has failed the capacity test. Technician A says if the voltage recovers to12.45 volts, the battery is still good. Technician B says if the voltage level does not return to 12.4 volts, recharge the battery and repeat the capacity test. Who is correct?

• A only

• B only

• Both A and B

• Neither A nor B

Technician A says the best way to charge the HV battery by allowing the engine to run. Technician B says usually an onboard jump assist method is available to start the engine if the HV battery SOC is too low. Who is correct?

• A only

• B only

• Both A and B

• Neither A nor B

While jump-starting a vehicle, a puff of smoke is observed and the engine ground cable is burned. Technician A says this happened because the two vehicles were touching. Technician B says this was caused by connecting the negative jumper cable to the disabled vehicle’s engine ground. Who is correct?

• A only

• B only

• Both A and B

• Neither A nor B

Ice crystals are found in the electrolyte. This can be caused by:

• A discharged battery.

• Use of tap water

• Reversed battery connections.

• Improper holddowns.