Deck 7: Batteries

Question 1

Which of the following conditions can shorten the life of a heavy-duty,wet cell,lead acid battery?

A) overcharging
B) undercharging
C) deep-cycling
D) all of the above

Answer 1

D

Question 2

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?

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

Answer 2

A

Question 3

Technician A says that a sulfated battery is less likely to freeze in extreme cold temperatures.Technician B says that a sulfated battery often measures an abnormally high voltage across its terminals immediately after charging.Who is correct?

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

Answer 3

B

Question 4

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

A) 1.225
B) 1.250
C) 1.265
D) 1.290

Question 5

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

A) 64% sulfuric acid,36% distilled water
B) 36% sulfuric acid,64% distilled water
C) 100% sulfuric acid
D) 100% distilled water

Question 6

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?

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

Question 7

When preparing to load test a lead-acid battery,the technician first checks the integral hydrometer eye and sees that it is dark.What should be done next?

A) Fully charge the battery before attempting to test it
B) Replace the battery,it has a low electrolyte level
C) Proceed with the test,the battery is fully charged
D) Remove the surface charge,then proceed to test the battery

Question 8

Which of the following defines a galvanic device?

A) produces voltage by chemical action
B) induces voltage by inductance
C) induces a static charge
D) stores a capacitive charge

Question 9

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

A) atomic mass
B) specific gravity
C) relative gravity
D) liquid mass

Question 10

When replacing a battery,which is the recommended sequence to use in disconnecting and re-connecting the cables?

A) Disconnect the ground cable first and re-connect it last
B) Disconnect the ground cable last and re-connect it first
C) Disconnect the positive cable first and re-connect it last
D) Disconnect the positive cable last and re-connect it last

Question 11

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?

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

Question 12

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

A) 1/2 of the CCA rating for 15 seconds
B) 100% of the CCA rating for 30 seconds
C) 1/2 of the amp/hour rating for 45 seconds
D) 1/2 of the amp/hour rating for 15 seconds

Question 13

Which of the following terms best describes the rapid charge-and-complete discharge cycling of a battery?

A) transient cycling
B) deep-cycling
C) sulfation
D) aeration

Question 14

When there are multiple 12-volt batteries in a bank,how must they be connected in a truck with a chassis voltage of 12-volts?

A) in series
B) in parallel
C) both A and B
D) neither A nor B

Question 15

Who invented the first battery?

A) William Gilbert
B) Alessandro Volta
C) Benjamin Franklin
D) Joseph Priestly

Question 16

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?

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

Question 17

Which of the following conditions could result in an undercharged batteries?

A) loose belt (s)
B) defective diode trio
C) residual magnetism in the rotor
D) all of the above

Question 18

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

A) distilled water
B) pure sulfuric acid
C) water and sulfuric acid solution
D) water and hydrochloric acid solution

Question 19

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

A) antimony
B) lead peroxide
C) sponge lead
D) calcium

Question 20

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

A) antimony
B) lead peroxide
C) sponge lead
D) calcium

Question 21

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

A) ampere-hour rating
B) reserve capacity
C) cold cranking amps
D) none of the above

Question 22

When testing specific gravity of a lead-acid battery,which of the following produces a reading that is not influenced by the actual temperature of the electrolyte?

A) built-in hydrometer
B) glass bulb hydrometer
C) plastic float type hydrometer
D) refractometer

Question 23

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?

A) 8.5 volts
B) 9.6 volts
C) 10.2 volts
D) 12.6 volts

Question 24

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?

A) 2.090 volts
B) 2.100 volts
C) 2.110 volts
D) 2.165 volts

Question 25

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

A) replace the battery
B) charge at high amperage
C) heat with a propane torch
D) trickle charge and observe response

Question 26

What is a common result of deep-cycling a lead acid battery?

A) explosions
B) extended life
C) plate buckling
D) corroded posts

Question 27

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?

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

Question 28

Assuming that the electrolyte mixture is correct,which of the following specific gravity readings would indicate that a lead-acid battery was completely dead?

A) 1.150
B) 1.190
C) 1.210
D) 1.225

Question 29

Which of the following battery types can best sustain repeated deep-cycling?

A) standard lead-acid
B) low-maintenance lead acid
C) maintenance-free lead acid
D) gelled electrolyte

Question 30

Which of the following is an advantage of a maintenance-free lead acid battery compared with a similarly sized and rated standard battery?

A) higher CCA
B) sustains overcharging without failing
C) longer inactivated shelf life
D) all of the above

Question 31

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

A) standard lead-acid
B) maintenance-free lead-acid
C) low-maintenance lead-acid
D) gelled electrolyte

Question 32

When inspecting a lead-acid battery with an integral hydrometer,you can see the colored dot is yellow through the sight glass.What does this tell you?

A) Battery is fully discharged
B) Battery is fully charged
C) It is safe to charge the battery
D) Discard the battery

Question 33

Which of the following would be a consequence of reversing the polarity of a battery bank on truck electrical system?

A) battery explosion
B) damage to the truck electronics
C) damage to the alternator
D) all of the above

Question 34

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

A) 80 degrees Fahrenheit
B) 60 degrees Fahrenheit
C) 32 degrees Fahrenheit
D) 0 degrees Fahrenheit

Question 35

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

A) used only for cranking
B) used primarily when engine is off
C) used only when other batteries are flat
D) used to power-up the data bus

Question 36

Which of the following statements about a standard lead-acid battery is true when compared with a maintenance-free battery?

A) better ability to handle deep-cycling
B) lower reserve capacity
C) faster discharge rate
D) all of the above

Question 37

Technician A says that battery cells that require frequent topping up is an indication of over-charging.Technician B says that voltage regulators should not be set above 14.1 volts on many current trucks.Who is correct?

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

Question 38

During a wet cell battery charge cycle,what do the water molecules in the electrolyte reduce to?

A) sulfuric acid
B) hydrogen only
C) oxygen only
D) hydrogen and oxygen

Question 39

When load testing a fully charged,lead-acid battery at 0 degrees Fahrenheit at one half the rated CCA for 15 seconds,what is the lowest acceptable voltage during the test?

A) 8.5 volts
B) 9.6 volts
C) 10.2 volts
D) 12.6 volts

Question 40

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

A) distilled water
B) baking soda and water
C) clean electrolyte
D) chassis grease

Question 41

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

A) SAE metric 80 mm
B) SAE metric 60 mm
C) SAE 2/0 or 00
D) SAE 1/0 or 0

Question 42

On current trucks with data bus driven electronics,where is recommended you should place the ground clamp from a battery charger or when boosting?

A) on the starter ground post
B) on the frame rail
C) directly on the alternator post
D) directly on the battery ground post

Question 43

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?

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

Question 44

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

A) trickle charge for 24 hours
B) replace the battery
C) fast charge for 60 minutes,then check
D) heat the battery up to 80 degrees

Question 45

Which of the following is the battery manufacturer's recommended method of removing the surface charge from a recently charged lead-acid battery?

A) crank engine 15 seconds,wait 15 minutes
B) turn on all of the vehicle lights
C) leave it for 24 hours
D) load at 300 amps for 15 seconds

Question 46

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

A) 1/0 or 0
B) 2/0 or 00
C) 3/0 or 000
D) 4/0 or 0000

Question 47

When using a Midtronics type capacitance tester to evaluate battery performance,which of the following data MUST be input?

A) ambient temperature
B) CCA
C) starter motor type
D) specific gravity reading

Question 48

Technician A says that it is acceptable to load test a sealed lead-acid battery providing the temperature is not below 32 degrees Fahrenheit.Technician B says that BCI recommends that carbon pile testing should be performed by loading the battery at one half of the specified CCA rating.Who is correct?

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

Question 49

If you know that a battery has become sulfated after a long period of inactivity and you want to save it,which of the following methods would be most likely to succeed?

A) replace the electrolyte with fresh
B) high charge for 24 hours
C) trickle charge for 2 days
D) connect in parallel with a known good battery then fast charge

Question 50

What is the main advantage of modern battery conductance test instruments?

A) the most accurate means of battery testing
B) reduces the incidence of mis-diagnosed batteries
C) can accurately predict remaining battery life
D) all of the above

Question 51

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?

A) disconnect the engine ECM before cranking
B) turn on all of the chassis lights before connecting the generator
C) make sure all electrical accessories are turned off
D) turn on just the headlights before connecting the generator

Question 52

Which of the following methods is the correct approach to cranking a hard to start,truck diesel engine using wet cell batteries?

A) crank for 2 minutes,rest for 15 seconds
B) crank for 30 seconds,rest for 2 minutes
C) crank for 15 seconds,rest for 2 minutes
D) crank until the batteries die