Deck 5: Automotive Batteriesbattery Diagnosis and Service

Question 1

The battery of a vehicle has "died" three days in a row. Each day the customer was able to start the car after he charged the battery. He was then able to drive the car 150 miles, but the next morning the battery was again discharged. A battery current drain test revealed a 10 mA drain. Technician A says the current drain is excessive and it could be the source of the problem. Technician B says that further testing is required, but it is possible that the battery may need to be replaced. Who is correct?

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

Answer 1

B

Question 2

An open circuit voltage in the 12.6-volt range indicates an overcharged battery.

Answer 2

False

Question 3

How may batteries be rated?

A) Ampere-hours
B) Reserve capacity
C) Cold Cranking Amps
D) Any of the above

Answer 3

D

Question 4

Sulfating is increased if a battery is left in a discharged state for extended periods of time.

Question 5

A battery must be fully charged before testing with a conductance tester.

Question 6

Which of the following statements is NOT true of a replacement battery?

A) It may have the same rating as the original battery
B) It may have a higher rating than the original battery
C) It may have a lower rating than the original battery
D) It should be selected according to an application chart

Question 7

Technician A says a 12.6-volt open circuit voltage reading indicates a fully charged battery. Technician B says a corrected hydrometer reading of 1.265 indicates that a battery cell has the proper electrolyte specific gravity. Who is correct?

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

Question 8

Which of the following is an indication of how well a battery would perform if the charging system of a vehicle failed?

A) Cold cranking amps
B) Hot cranking amps
C) Amp-hour rating
D) Reserve capacity

Question 9

How long can an automotive battery with a cold cranking rating of 380 deliver 380 amperes?

A) 30 seconds at 0º F
B) 60 seconds at 0ºF
C) 90 seconds at 32ºF
D) 90 seconds at 0ºF

Question 10

Having to add water to a low-maintenance battery can be an indication of a higher-than-specified charging voltage.

Question 11

Technician A says the current capacity rating of a battery depends on the types of materials used in the construction of the battery. Technician B says the amount of electrical energy that a battery is capable of producing depends on the size, weight, and active area of the plates. Who is correct?

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

Question 12

Charging batteries can produce hydrogen and oxygen gasses.

Question 13

Technician A says during a load test, the battery voltage must not fall below 9.6 volts. Technician B says the load applied should be half the cold cranking amp rating. Who is connect?

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

Question 14

A three-minute charge test can be used instead of a hydrometer to test a cell's state of charge.

Question 15

A load of 325 amperes for a 650 cold cranking amperage battery is the correct capacity load test amperage.

Question 16

Battery electrolyte is a mixture of water and what other element?

A) Lead dioxide
B) Sulfuric acid
C) Sulfur dioxide
D) Hydrochloric acid

Question 17

The electrolyte solution consists of 64% water and 36% sulfuric acid by weight.

Question 18

During the capacity test the voltage reads 10.6 volts. This indicates that the battery must be replaced.

Question 19

Battery efficiency is reduced as the temperature falls below 82ºF (28ºC).

Question 20

At 80ºF, what is the correct specific gravity of electrolyte in a fully charged battery?

A) 1.200
B) 1.220
C) 1.265
D) 1.290

Question 21

At the conclusion of a three-minute charge test, the voltage reading for a satisfactory 12-volt battery should not exceed how many volts?

A) 13.0 volts
B) 15.5 volts
C) 12.6 volts
D) 9.6 volts

Question 22

A 450 cold cranking amperage battery is being load tested. What will the correct load be?

A) 1350 amperes
B) 450 amperes
C) 225 amperes
D) 990 amperes

Question 23

Unlike conventional capacitors that use a dielectric, the ultra-capacitors use a(n) ____.

A) gel
B) electrochemical
C) gas
D) electrolyte

Question 24

All recombination batteries are classified as valve-regulated batteries since they have one-way safety valves that control the ____ of the battery case.

A) ratings
B) internal pressure
C) resin coating
D) temperature

Question 25

Why should specific gravity readings be temperature compensated?

A) They are a more accurate indicator of the actual state of charge.
B) Electrolyte gets thicker as it gets warmer than 80ºF.
C) Hydrometers do not work on cold batteries.
D) None of these choices.

Question 26

Electrical energy is produced in the battery by the chemical reaction that occurs between two dissimilar plates that are immersed in a(n) ____ solution.

A) pure water
B) pure acid
C) electrolyte
D) alkali

Question 27

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

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

Question 28

The HV battery is charged when the vehicle is driven, or when the engine is running. This is the ____ method of charging the HV battery pack.

A) best
B) only
C) fast
D) slow

Question 29

Why should specific gravity readings be temperature compensated?

A) They are a more accurate indicator of the actual state of charge
B) Electrolyte gets thicker as it gets warmer than 80ºF
C) Hydrometers do not work on cold batteries
D) None of the above

Question 30

Which of the following statements about battery ratings is true?

A) The ampere-hour rating is defined as the amount of steady current that a fully charged battery can supply for 1 hour at 80ºF (26.7ºC) without the cell voltage falling bellow a predetermined voltage.
B) The cold cranking amperage  rating represents the number of amps that a fully charged battery can deliver at 0ºF (-17.7ºC) for 30 seconds while maintaining a voltage above 9.6 volts for a 12 volt battery.
C) The cranking amperage rating expresses the number of amperes a battery can deliver at 32ºF (0ºC) for 30 seconds and maintain at least 1.2 volts per cell.
D) The reserve capacity rating expresses the number of amperes a fully charged battery at 80ºF can supply before the battery's voltage falls below 10.5 volts.

Question 31

What is the principle cause of battery water loss?

A) Spillage from the vent caps
B) Leakage through the battery case
C) Conversion of water to sulfuric acid
D) Evaporation due to heat of the charging current

Question 32

How much of a change in specific gravity readings does temperature compensation involve for every 10 degrees?

A) 0.004
B) 0.040
C) 0.400
D) 4.000

Question 33

The condition of a battery cable end (where it connects to the battery post) is questionable. Technician A says a battery leakage test will determine the quality of the connection. Technician B says a battery terminal voltage drop test can be used to determine the quality of the connection. Who is correct?

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

Question 34

How many volts can each cell of an automobile battery produce?

A) 1.2 volts
B) 2.1 volts
C) 4.2 volts
D) 6 volts

Question 35

Which of the following statements about NiMH cells is NOT true?

A) When a NiMH cell discharges, hydrogen moves from the anode to the cathode electrode.
B) Nickel-metal hydride batteries have an anode electrode that contains nickel hydroxide.
C) The alkaline electrolyte has no active role in the chemical reaction.
D) The plates are separated by a sheet of fine fibers saturated with potassium hydroxide.

Question 36

Technician A says most hybrid vehicles have a high voltage battery pack. Technician B says most vehicles have a 12 volt battery. Who is correct?

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

Question 37

____ reduce the amount of vibration and help increase the life of the battery.

A) Holddowns
B) Heat shields
C) Cables
D) Grommets

Question 38

Technician A says a fully charged battery will not freeze as easily as a discharged one. Technician B says the specific gravity of a fully discharged battery is around 1.100. Who is correct?

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

Question 39

When using a battery starter tester to make a battery load test, turn the control knob to draw battery current at a rate equal to which of the following?

A) The battery's ampere-hour rating
B) Twice the battery's ampere-hour rating
C) 15.5 volts for a 12-volt battery
D) 1/2 of the battery's cold cranking amps rating

Question 40

The reserve-capacity rating is determined by the length of time, in minutes, that a fully charged battery can be discharged at ____ amps before battery voltage drops below 10.5 volts.

A) 20
B) 25
C) 35
D) 50

Question 41

Do not use more than ____ volts to jump-start a vehicle that is equipped with an engine control module.

A) 8
B) 12
C) 14
D) 16

Question 42

Describe the main purposes of the vehicle battery.

Question 43

What advantages does a maintenance-free battery have over a conventional battery?

Question 44

What rating indicates the battery's ability to deliver a specified amount of current to start an engine at low ambient temperatures?

Question 45

What test is being performed in the figure below?

Question 46

Explain how to perform a battery load test.

Question 47

Name the four types of battery capacity ratings.

Question 48

A ____ test is conducted to see if current is flowing across the battery case.

A) battery terminal
B) battery leakage
C) state of charge
D) capacity

Question 49

If allowed to accumulate, dirt and grease on the top of the battery can form a ____ between the battery terminals.

A) short
B) vapor condensation
C) conductive path
D) parasitic drain

Question 50

What is the makeup of the electrolyte solution used in automotive batteries?

Question 51

Computer control modules use memories that require battery voltage to be maintained and will ____ if the battery is disconnected.

A) reset
B) short out
C) remain
D) repair themselves

Question 52

What is the specific gravity of a fully charged battery at 80ºF (26.7ºC)?

Question 53

What type of battery uses separators that hold a gel-type material in place of liquid electrolyte.

Question 54

What is the advantage of battery conductance testing?

Question 55

What safety precautions should be taken when working with a battery?

Question 56

What type of energy conversion occurs when a battery is discharging?

Question 57

What factors determine current output capacity of an automotive battery?

Question 58

What effect does corrosion on the battery terminals have on the battery output?

Question 59

Properly sealed NiMH batteries that are not leaking are considered dry cell batteries and are not ____.

A) recyclable
B) reusable
C) rechargeable
D) hazardous waste

Question 60

What term is used to describe electrical loads that are still present after the ignition switch is in the off position?