Chapter 7 Flashcards
Batteries
What solution is recommended to neutralize and clean corrosion from battery posts and terminals?
baking soda and water
What electrolyte specific gravity measured at 80 degrees Fahrenheit should indicate that a lead-acid battery is fully charged?
1.265
What type of battery is used where an isolated battery is required?
gelled electrolyte
Which of the following defines a galvanic device?
produces voltage by chemical action
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?
Technician A only
What is SAE metric battery cable of 100 mm equivalent to?
4/0 or 0000
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?
Neither A nor B
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?
9.6 volts
Which of the following represents the correct mixture proportions required of the electrolyte in a lead acid battery?
36% sulfuric acid, 64% distilled water
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?
make sure all electrical accessories are turned off
What is the chemically active matter on the anode plates of wet cell, lead-acid batteries?
lead peroxide
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?
Technician A
What temperature is the cold cranking amp capability of a lead-acid based on?
80 degrees Fahrenheit
If you suspect that a lead-acid battery has frozen, after bringing it to room temperature, what should you do first?
trickle charge and observe response
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?
Both A and B
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?
Technician B only
What is the primary method of rating current truck lead-acid batteries?
cold cranking amps
Which of the following battery cables would have the largest sectional diameter?
SAE metric 80 mm
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?
Both A and B
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?
2.090 volts
When load-testing a lead-acid battery, which of the following would be the recommended load to be drawn by the carbon pile?
1/2 of the CCA rating for 15 seconds
What is the role played by a battery described as an isolated battery in a truck electrical system?
used primarily when engine is off
What is used as electrolyte in a vehicle lead-acid battery?
water and sulfuric acid solution
If the integral charge indicator in a lead-acid battery is clear in color, what should you do?
replace the battery
The term used to describe the weight of a volume of a liquid versus the weight of an equal volume of pure water is:
specific gravity
