Chapter 7

Question 1

What solution is recommended to neutralize and clean corrosion from battery posts and terminals?

Answer 1

baking soda and water

Question 2

What electrolyte specific gravity measured at 80 degrees Fahrenheit should indicate that a lead-acid battery is fully charged?

Answer 2

1.265

Question 3

What type of battery is used where an isolated battery is required?

Answer 3

gelled electrolyte

Question 4

Which of the following defines a galvanic device?

Answer 4

produces voltage by chemical action

Question 5

Technician A says that excessive vibration can shorten the life of a lead-acid battery by shaking the active material from the plates. Technician B says that wet cell truck batteries are designed to sustain high levels of vibration and this seldom causes premature failures. Who is correct?

Answer 5

Technician A only

Question 6

What is SAE metric battery cable of 100 mm equivalent to?

Answer 6

4/0 or 0000

Question 7

Technician A says that adding pure sulfuric acid to a discharged lead-acid battery is a recommended means of reducing the time required to charge it. Technician B says that it is acceptable to add tap water to top-up the electrolyte in a lead-acid battery. Who is correct?

Answer 7

Neither A nor B

Question 8

When load testing a fully charged, lead-acid battery at 80 degrees Fahrenheit at one half the rated CCA for 15 seconds, what is the lowest acceptable voltage during the test?

Answer 8

9.6 volts

Question 9

Which of the following represents the correct mixture proportions required of the electrolyte in a lead acid battery?

Answer 9

36% sulfuric acid, 64% distilled water

Question 10

When using a portable generator to fast charge a set of discharged batteries on a truck, which of the following would be best practice to get the unit started?

Answer 10

make sure all electrical accessories are turned off

Question 11

What is the chemically active matter on the anode plates of wet cell, lead-acid batteries?

Answer 11

lead peroxide

Question 12

Technician A says that wet cell battery gassing produces an explosive mixture of hydrogen and oxygen and that great care should be taken any time a battery is being charged. Technician B says that gassing occurs only during battery discharge cycles on maintenance-free batteries. Who is correct?

Answer 12

Technician A

Question 13

What temperature is the cold cranking amp capability of a lead-acid based on?

Answer 13

80 degrees Fahrenheit

Question 14

If you suspect that a lead-acid battery has frozen, after bringing it to room temperature, what should you do first?

Answer 14

trickle charge and observe response

Question 15

Technician A says that a defective voltage regulator can result in overcharging the batteries. Technician B says that when batteries are overcharged, they can boil off electrolyte. Who is correct?

Answer 15

Both A and B

Question 16

Technician A says that used batteries can be disposed of in the garbage providing the electrolyte is removed first. Technician B says that battery vendors are usually required by law to receive as many batteries for recycling as they sell. Who is correct?

Answer 16

Technician B only

Question 17

What is the primary method of rating current truck lead-acid batteries?

Answer 17

cold cranking amps

Question 18

Which of the following battery cables would have the largest sectional diameter?

Answer 18

SAE metric 80 mm

Question 19

Technician A says that a recombinant battery is usually required where an isolated battery is specified. Technician B says that gelled electrolyte batteries are much less likely to produce corrosion on the battery posts and terminals. Who is correct?

Answer 19

Both A and B

Question 20

Using the 84-factor method of correlating specific gravity (SG) to voltage, what would a SG reading in one cell of 1.250 convert to?

Answer 20

2.090 volts

Question 21

When load-testing a lead-acid battery, which of the following would be the recommended load to be drawn by the carbon pile?

Answer 21

1/2 of the CCA rating for 15 seconds

Question 22

What is the role played by a battery described as an isolated battery in a truck electrical system?

Answer 22

used primarily when engine is off

Question 23

What is used as electrolyte in a vehicle lead-acid battery?

Answer 23

water and sulfuric acid solution

Question 24

If the integral charge indicator in a lead-acid battery is clear in color, what should you do?

Answer 24

replace the battery

Question 25

The term used to describe the weight of a volume of a liquid versus the weight of an equal volume of pure water is:

Answer 25

specific gravity