Question 1

How many volts can each cell of an automobile battery produce ?&#10;A) 1.2 volts&#10;B) 2.1 volts&#10;C) 4.2 volts&#10;D) 6 volts

Accepted Answer

Each cell of an automobile battery can produce 2.1 volts.

Question 2

Ice crystals are found in the electrolyte. This can be caused by :&#10;A)A discharged battery .&#10;B)Use of tap water .&#10;C) Reversed battery connections .&#10;D) Improper hold downs .

Accepted Answer

Ice crystals are formed in the electrolyte when the battery is discharged. This indicates that the battery has been left in a discharged state for a long time or has been used extensively without being recharged.

Question 3

What is the main cause of battery water loss ?&#10;A) Spillage from the vent caps&#10;B) Leakage through the battery case&#10;C) Conversion of water to sulfuric acid&#10;D) Evaporation due to heat of the charging current

Accepted Answer

The evaporation of water due to the heat generated by the charging current is the main cause of battery water loss. This is because charging causes the electrolyte to heat up and produce water vapor, which escapes through the vent caps. Spillage from the vent caps and leakage through the battery case can also contribute to water loss, but they are typically not the main cause. The conversion of water to sulfuric acid does not result in water loss, as the overall amount of liquid in the battery remains the same.

Question 4

Which of the following statements is NOT true of a replacement battery ?&#10;A) It may have the same rating as the original battery.&#10;B)It may have a higher rating than the original battery.&#10;C) It may have a lower rating than the original battery.&#10;D) It should be selected according to an application chart.

Accepted Answer

Replacement batteries can have the same or higher ratings than the original battery, and should be selected based on an application chart. However, using a battery with a lower rating than the original could lead to insufficient power delivery and potential device malfunction, making this option generally not recommended.

Question 5

How may batteries be rated ?&#10;A) Ampere-hours&#10;B)Reserve capacity&#10;C) Cold Cranking Amps&#10;D) Any of these choices

Accepted Answer

Batteries may be rated in different ways depending on their intended use, such as Ampere-hours for deep cycle batteries, Reserve capacity for automotive batteries, and Cold Cranking Amps for starting batteries. Therefore, any of these choices could be the best depending on the specific application.

Question 6

Why should specific gravity readings be temperature compensated ?&#10;A) They are a more accurate indicator of the actual state of charge.&#10;B) Electrolyte gets thicker as it gets warmer than 80 degrees F.&#10;C) Hydrometers do not work on cold batteries.&#10;D) None of these choices.

Accepted Answer

Specific gravity readings are affected by the temperature of the electrolyte, so it is important to compensate for temperature in order to get a more accurate indication of the state of charge. If the temperature is not taken into account, the specific gravity readings may be misleading and result in incorrect conclusions about the battery's state of charge.

Question 7

How long can an automotive battery with a cold cranking rating of 380 deliver 380 amperes ?&#10;A) 30 seconds at 0 degrees F&#10;B) 60 seconds at 0 degrees F&#10;C) 90 seconds at 32 degrees F&#10;D) 90 seconds at 0 degrees F

Accepted Answer

The duration of time that a battery can deliver its rated amperage is dependent on many factors including temperature, age, and the condition of the battery. However, as a general rule, a battery with a cold cranking rating of 380 amperes can only deliver that amount of current for a very short period of time. At 0 degrees F, the battery can deliver 380 amperes for approximately 30 seconds before its voltage drops too low to start an engine.

Question 8

When using a battery load tester to conduct a battery load test, turn the control knob to draw battery current at a rate equal to which of the following ?&#10;A) The battery's ampere-hour rating.&#10;B) Twice the battery's ampere-hour rating.&#10;C) 15.5 volts for a 12-volt battery.&#10;D) 1/2 of the battery's cold cranking amps rating.

Accepted Answer

When conducting a battery load test, the control knob should be turned to draw battery current at a rate equal to 1/2 of the battery's cold cranking amps rating. This is because cold cranking amps (CCA) is a measure of a battery's ability to deliver current at low temperatures, and drawing current at a rate equal to half the CCA rating provides a good measure of the battery's performance under normal operating conditions. Drawing current at a rate equal to the battery's ampere-hour rating or twice its ampere-hour rating is not appropriate for a load test, as it does not provide an accurate measure of the battery's performance. Similarly, drawing current at 15.5 volts for a 12-volt battery is not appropriate, as it exceeds the battery's normal operating voltage and can damage the battery.

Question 9

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:

A)The starter motor is drawing too much current .
B)The glove box light is staying on .
C)A computer is not powering down .
D)A relay contact is stuck closed .

Accepted Answer

The starter motor drawing too much current would cause issues when starting the car at any time, not just in the morning. The other options could cause a battery drain overnight.

Question 10

At the end of a three-minute charge test, the voltage reading for a satisfactory 12-volt battery should not exceed how many volts ?&#10;A) 13.0 volts&#10;B) 15.5 volts&#10;C) 12.6 volts&#10;D) 9.6 volts

Accepted Answer

A satisfactory 12-volt battery should not exceed 15.5 volts at the end of a three-minute charge test, as this indicates the battery is accepting charge properly without being overcharged.

Question 11

A 450 cold cranking amperage battery is being load tested. What will the correct load be ?&#10;A) 1350 amperes&#10;B) 450 amperes&#10;C) 225 amperes&#10;D) 990 amperes

Accepted Answer

The answer of A 450 cold cranking amperage battery is...

Question 12

How much of a change in specific gravity readings does temperature compensation involve for every 10 degrees ?&#10;A) 0.004&#10;B) 0.040&#10;C) 0.400&#10;D) 4.000

Accepted Answer

The answer of How much of a change in specific...

Question 13

At 80 degrees F, what is the correct specific gravity of electrolyte in a fully charged battery?&#10;A) 1.200&#10;B)1)220&#10;C) 1.265&#10;D) 1.290

Accepted Answer

The answer of At 80 degrees F, what is the...

Question 14

Which of the following statements about battery ratings is true?&#10;A)The ampere-hour rating is defined as the amount of steady current that a fully charged battery can supply for 1 hour at 80&#176;F (26.7&#176;C) without the cell voltage falling below a predetermined voltage.&#10;B)The cold cranking amps rating represents the number of amps that a fully charged battery can deliver at O&#176;F (17.7&#176;C) for 30 seconds while maintaining a voltage above 9.6 volts for a 12V battery.&#10;C)The cranking amp rating expresses the number of amperes a battery can deliver at 32&#176;F (O&#176;C) for 30 seconds and maintain at least 1.2 volts per cell.&#10;D)The reserve capacity rating expresses the number of amperes a fully charged battery at 80&#176;F can supply before the battery's voltage falls below 10.5 volts.

Accepted Answer

The answer of Which of the following statements about battery...

Question 15

Which of the following is an indication of how well a battery would perform if the charging system of a vehicle failed ?&#10;A) Cold cranking amps&#10;B) Hot cranking amps&#10;C) Amp-hour rating&#10;D) Reserve capacity

Accepted Answer

The answer of Which of the following is an indication...

Question 16

When charging a battery :&#10;A)Connect a voltmeter across the battery terminals while the battery is charging and keep the charge rate at fewer than 10 volts .&#10;B)Disconnect the negative battery cable before charging to prevent damage to the alternator and computers .&#10;C) Charge at an amperage rate of 50% of the CCA rating .&#10;D) All of these choices .

Accepted Answer

The answer of When charging a battery :&#10;A)Connect a voltmeter...

Question 17

Battery electrolyte is a mixture of water and what other element ?&#10;A) Lead dioxide&#10;B) Sulfuric acid&#10;C) Sulfur dioxide&#10;D) Hydrochloric acid

Accepted Answer

The answer of Battery electrolyte is a mixture of water...

Deck 5: Automotive Batteries Battery Diagnosis and Service