Week 5 Chapter 14, 15, and 16 Test Questions

DS 100

Secondary batteries for commercial vehicles convert chemical energy into electric current through what process?

Select one:

a. Electrolysis

b. Hydrolysis

c. Galvanic reaction

d. Combination reaction

c. Galvanic reaction

In vehicles, batteries perform all of the following functions, EXCEPT:

Select one:

a. Diminishing the affects of corrosion

b. Storing energy over long periods of time

c. Acting as an electrical shock absorber for the vehicle’s electrical systems

d. Providing electrical energy to operate the starter motor during cranking

a. Diminishing the affects of corrosion

What type of system is typically used to separate the main vehicle electrical system from the deep cycled battery circuit?

Select one:

a. Voltage reduction system

b. Battery isolator system

c. Battery protection system

d. Battery divider system

b. Battery isolator system

Technician A says lead-acid batteries have a limited shelf life even when stored dry. Technician B says lead-acid batteries are the least expensive to manufacture in terms of cost per watt of power. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

b. Technician B

What instrument is used to check the specific gravity of liquids?

Select one:

a. Hydrometer

b. Voltmeter

c. Ammeter

d. Electro-hydraulic pump

a. Hydrometer

_____ plates are very think, porous, glass-fiber materials allowing the electrolyte to diffuse freely throughout the cell and prevent plate contact.

Select one:

a. Negative

b. Positive

c. Separator

d. Deep cycle

c. Separator

What can occur if a battery is left in a discharged state for a long period of time, continually undercharged, or left partially charged?

Select one:

a. Galvanic reaction

b. Ignition

c. Sulfation

d. Recombination

c. Sulfation

A battery’s self-discharge rate is dependent on the selection of materials used during manufacturing and _____.

Select one:

a. The reserve capacity

b. Temperature

c. Electrolyte composition

d. The difference in voltage between the battery terminals

b. Temperature

While discussing the disadvantages of low- and no-maintenance batteries, Technician A says these batteries often have a lower self-discharge rate. Technician B says these batteries have difficulty accepting a boost when completely discharged. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

b. Technician A

Which of the following cause excessive gassing?

Select one:

a. Antimony alloyed grids

b. Black-carbon graphite foams

c. Lead peroxide plates

d. Hydrogen and oxygen gases

a. Antimony alloyed grids

Batteries used for what purpose are commonly termed starting, lighting, and ignition (SLI) batteries?

Select one:

a. Hybrid

b. Cranking

c. Marine

d. Deep cycle

b. Cranking

_____ are current draws on the battery when the ignition is switched off.

Select one:

a. Cold cranking amps

b. Electrical reserve capacities

c. Key-off electrical loads

d. Cranking amps

c. Key-off electrical loads

Batteries for commercial vehicles using diesel engines are designed to supply high _____ to the starting motor for short periods of time.

Select one:

a. Amperage

b. Tolerance

c. Voltage

d. Resistance

a. Amperage

A single battery cell consists of two dissimilar metals: an electrolyte and _____.

Select one:

a. electrodes

b. lead

c. a conductor

d. an insulator material

a. electrodes

The amount of _____ that a battery supplies is a function of the surface area of the plates.

Select one:

a. Discharge

b. Amperage

c. Resistance

d. Voltage

b. Amperage

Batteries are generally classified by _____.

Select one:

a. Application

b. Duration

c. Operation

d. Configuration

a. Application

What type of battery is used to deliver a lower, steady level of power for a longer period of time?

Select one:

a. Sealed lead-acid

b. Deep cycle

c. Valve-regulated lead-acid

d. Traction

b. Deep cycle

What is another name for a VRLA battery?

Select one:

a. Hybrid drive battery

b. Nickel-metal hydride battery

c. Traction battery

d. Recombinant battery

d. Recombinant battery

When the _____ of battery acid is too low, such as when a battery is discharged, it may freeze in colder climates. Select one:

a. Amp-hour

b. Specific gravity

c. Reserve capacity

d. Parasitic draw

b. Specific gravity

Technician A says a gap between the plates and the bottom of each cell forms a sediment trap. Technician B says ribbing and irregular features on the outside of the case add to the appearance of the battery and make it sturdy. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

a. Technician A

How many volts do the electrodes and electrolyte of a lead-acid battery cell produce?

Select one:

a. 2.3 volts

b. 2.0 volts

c. 2.1 volts

d. 2.5 volts

c. 2.1 volts

What substance can be used to effectively neutralize electrolyte spills?

Select one:

a. Water

b. Sodium bicarbonate

c. Lithium

d. Calcium

b. Sodium bicarbonate

Battery plates are made of two different compositions of lead fabricated from paste bonded to leas alloy grids. The negative plate used lead. What does the positive plate use?

Select one:

a. Silver alloy

b. Lead sulfate

c. Lead peroxide

d. Sulfuric acid

c. Lead peroxide

Which of the following is a measure of a battery’s capacity and is an important rating when selecting a deep-cycle battery?

Select one:

a. Reserve capacity

b. Amp-hour

c. Cranking amps

d. Specific gravity

b. Amp-hour

During charging and discharging, water is the electrolyte is broken apart into its constituents, hydrogen and oxygen. What is this process called?

Select one:

a. Sulfation

b. Gassing

c. Galvanic reaction

d. Electrolysis

d. Electrolysis

The latest innovation to lead-acid battery technology incorporates _____ foam into the plate paste to prevent sulfation damage.

Select one:

a. Calcium-lead alloy

b. Strontium

c. Cadmium

d. Black-carbon graphite

d. Black-carbon graphite

Which of the following is a measurement of battery capacity, in amps, that a battery can deliver for 30 seconds while maintaining a voltage of 1.2 volts per cell or higher at 0F (-18C)?

Select one:

a. Amp-hour

b. Cold cranking amps

c. Reserve capacity

d. Cranking amps

b. Cold cranking amps

What type of battery can deliver more cranking amperage and absorb 40% more charging current?

Select one:

a. SLI

b. Deep cycle

c. Traction

d. Absorbed glass mat

d. Absorbed glass mat

Why do no- and low-maintenance batteries need a large electrolyte reserve area above the plates?

Select one:

a. To store energy for longer periods

b. To absorb the electrical shocks

c. To compensate for some water loss

d. To increase the resistance to grid growth

c. To compensate for some water loss

An advantage of low- or no-maintenance batteries would include _____.

Select one:

a. Higher self-discharge rate

b. Grid growth/expansion

c. Lower electrical reserve capacity

d. Less gassing

d. Less gassing

Which of the following has demonstrated a very high resistance to grid growth and corrosion?

Select one:

a. Antimony alloy

b. Hard rubber

c. Calcium-lead alloy

d. Silver alloy

d. Silver alloy

Technician A says the latest and most advanced commercial vehicle battery technology is absorbed glass mat (AGM) batteries. Technician B says the AGM battery can deliver more cranking amperage and absorb up to 45% more charging current than conventional lead-acid battery. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

a. Technician A

What is a disadvantage of low- and no-maintenance batteries?

Select one:

a. Less gassing

b. Less water usage

c. Lower self-discharge rate

d. Grid growth/expansion

d. Grid growth/expansion

Although no-maintenance batteries contain a vent located beneath the top cover, the battery tops are completely _____.

Select one:

a. Concealed

b. Recharged

c. Sealed

d. Discharged

c. Sealed

Which of the following significantly lengthen battery life in high heat and severe service conditions?

Select one:

a. Silver alloy

b. Calcium

c. Antimony alloy

d. Cadmium

a. Silver alloy

Which of the following is an advantage of NiMH batteries over other battery types?

Select one:

a. Electrodes are made from an unusual alloy from a group of rare earth metals.

b. Lighter weight as compared to lead-acid batteries

c. Commonly used in laptops and cell phones

d. More high-end as compared to lithium batteries

b. Lighter weight as compared to lead-acid batteries

With no liquid electrolyte, what type of battery is immune to leaking?

Select one:

a. Lithium-ion

b. Nickel-metal hydride

c. Flooded cell

d. Absorbed glass mat

a. Lithium-ion

Li-ion cells maintain a constant voltage for over what percentage of their discharge curve?

Select one:

a. 50%

b. 80%

c. 5%

d. 90%

b. 80%

Technician A says gel-cell batteries cannot be considered spill-proof batteries. Technician B says gel-cell batteries are sensitive to overcharging and can be ruined by overcharging. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

b. Technician B

_____ batteries are AGM batteries in every way, except that the electrodes for each cell are not made of rectangular plates.

Select one:

a. VRLA

b. NiMH

c. Lithium-ion

d. Spiral-wound cell

d. Spiral-wound cell

The dielectric material in an ultra-capacitor is double layered and is made from _____.

Select one:

a. Nickel-metal hydride

b. Porous carbon

c. Lithium

d. Fiberglass

b. Porous carbon

Technician A says ultra-capacitors are particularly advantageous in situations requiring regenerative braking an in frequent stop-start systems, such as in electric and hybrid vehicles. Technician B says that unlike other battery technologies, ultra-capacitors are not worn out by continuous charge and discharge cycles. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

Battery balancers perform all of the following functions, EXCEPT:

Select one:

a. Prevent plate sulfation

b. Balance battery charging to within 1.0 volts

c. Charge 12-volt batteries from a 24-volt charging system

d. Balance battery discharge to within 0.1 volts

b. Balance battery charging to within 1.0 volts

Technician A says rotating the position of batteries will not correct the condition of unequal charge rates. Technician B says batteries will not charge discharge unevenly in multiple battery configurations, thereby shortening battery life. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

d. Neither Technician A nor Technician B

Which of the following is NOT one of the functions of an onboard battery management system?

Select one:

a. Enabling adaptive strategies or emergency “limp-home” mode in case of battery failure

b. Communicating with the onboard vehicle network to receive information and instructions from other electronic vehicle control units and responding to changes in the vehicle operating mode

c. Providing reverse polarity protection

d. Providing a digital service manual for major repairs on the high-voltage hybrid system

d. Providing a digital service manual for major repairs on the high-voltage hybrid system

Which of the following is NOT correct concerning NiMH batteries?

Select one:

a. Allison EV heavy-duty hybrids use these, as do many automotive electric hybrid systems.

b. NiMH batteries provide only one-fourth the power of lead-acid batteries, at 0.6 volts/cell compared to 2.1 volts/cell for lead-acid batteries.

c. The negative electrode is made of nickel hydroxide (NiOH2).

d. The electrolyte is composed of an alkaline.

b. NiMH batteries provide only one-fourth the power of lead-acid batteries, at 0.6 volts/cell compared to 2.1 volts/cell for lead-acid batteries.

When discussing Nickel-metal hydride (NiMH) batteries; Technician A says that the negative electrode is formed from NiOH2, while the positive electrode is NiOH. Technician B says that the negative electrode material has a unique ability to absorb hydrogen. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

b. Technician B

What type of batteries provides twice the energy storage of lead-acid by weight, but only half the power density?

Select one:

a. Spiral-wound cell

b. Absorbed glass mat

c. Lithium-ion

d. NiMH

d. NiMH

What is measured by the number of charge/discharge cycles as a function of depth of discharge?

Select one:

a. Energy efficiency

b. State of charge window

c. Life span

d. Energy density

c. Life span

Li-ion batteries have higher cell _____.

Select one:

a. Voltages

b. Connections

c. Amperages

d. Capacity

a. Voltages

What type of battery is destroyed at high temperatures and has been known to overheat and even catch fire when overcharged or damaged?

Select one:

a. NiMH

b. Li-ion

c. VRLA

d. Absorbed glass mat

b. Li-ion

What type of battery has twice the power density per kilogram of weight compared to NiMH chemistry?

Select one:

a. Absorbed glass mat

b. Spiral-wound cell

c. Li-ion

d. VRLA

c. Li-ion

LFP batteries have been preferred for electric vehicles because they have a favorable trade-off between cost and the high discharge rates required for low weight, longer life, and _____.

Select one:

a. Capacity

b. Cell voltage

c. Cooling

d. Acceleration

d. Acceleration

Which of the following is a disadvantage of current Li-ion battery technology?

Select one:

a. Can discharge current faster

b. Cost

c. Low internal resistance

d. Higher cell voltages

b. Cost

Technician A says AGM batteries are not pressurized internally. Technician B says AGM batteries will be damaged if charged at greater than 13.2 volts. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

d. Neither Technician A nor Technician B

What is the availability of usable battery voltage?

Select one:

a. Energy efficiency

b. State of charge window

c. Life span

d. Energy density

b. State of charge window

Technician A says there is no cable corrosion with a VRLA battery. Technician B says that a VRLA battery has the longest service life of all lead-acid battery types. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

Glass mat plate separators used in AGMs absorb _____ better than other batteries.

Select one:

a. Hydrogen

b. Mechanical shock

c. High-energy currents

d. Corrosive gas

b. Mechanical shock

What feature of ultra-capacitors makes them ideally suited for electric vehicle technology?

Select one:

a. They recharge in seconds.

b. They prevent voltage fluctuations.

c. They can be cycled thousands of times.

d. They enhance electromagnetic interference.

a. They recharge in seconds.

What is one of the main factors that determine how much electrical energy an ultra-capacitor can store?

Select one:

a. Cost in dollars per kWh

b. State of charge window

c. Energy density

d. Distance between the plates

d. Distance between the plates

In an ultra-capacitor, the greater the plate area, the higher the _____.

Select one:

a. Temperature

b. Voltage

c. Capacity

d. Cranking amperage

c. Capacity

Which of the following are electrical devices known for their ability to temporarily store short bursts of electrical energy?

Select one:

a. Balancers

b. Battery equalizers

c. Smart chargers

d. Capacitors

d. Capacitors

Ultra-capacitors are currently used to assist batteries for the first 1.5 seconds during cranking, where they can supply an additional _____ amps of current to supplement the starter batteries.

Select one:

a. 500

b. 1000

c. 2000

d. 4000

c. 2000

Battery management systems (BMS) are designed to perform all of the following functions, EXCEPT:

Select one:

a. Adjust battery voltage

b. Prolong the life of the battery

c. Protect the cells or the battery from damage

d. Maintain the state of charge for the battery to perform the specified work

a. Adjust battery voltage

Charging and discharging resistance changes with battery use and the electrical distance from the _____.

Select one:

a. Alternator

b. Capacitor

c. Ignition switch

d. Isolator relay

a. Alternator

Technician A says a battery isolator is a component of the battery management system. Technician B says a battery modulator is a component of the battery management system. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

d. Neither Technician A nor Technician B

Which of the following enables charging of an auxiliary battery by the vehicle charging system and electrical separation of the auxiliary battery from the starting circuit when the engine shuts down?

Select one:

a. Stop-start systems

b. Battery management systems

c. Battery equalizers

d. Battery isolator systems

d. Battery isolator systems

Technician A says many commercial vehicles use multiple battery banks that can be separated according to function. Technician B says a commercial vehicle has one battery bank of starting, lighting and ignition (SLI) batteries for the starting and main vehicle operating system, and another for auxiliary deep-cycle batteries for accessories. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

A hybrid battery management system will perform which of the following functions?

Select one:

a. Provide the highest vibration resistance

b. Enable no tray corrosion

c. Prolong the life of the battery

d. Provide reverse polarity protection

d. Provide reverse polarity protection

An onboard battery management system adjusts the battery state of charge to enable regenerative braking charges to be absorbed without _____.

Select one:

a. Isolating the batteries

b. Overcharging the battery

c. Changing the vehicle operating mode

d. Changing the rate of charge

b. Overcharging the battery

What is critical for series-connected battery cells in hybrid vehicle applications?

Select one:

a. Charge equalization

b. Amperage protection

c. Internal resistance

d. Reverse polarity protection

a. Charge equalization

Battery monitors typically collect all of the following data, EXCEPT:

Select one:

a. Temperature of each battery

b. Voltage of the pack

c. Diagnostic information on battery/cell condition

d. Rate of charge or discharge

c. Diagnostic information on battery/cell condition

While discussing batteries, Technician A says visual checks include checking the electrolyte level if it is possible. Technician B says most batteries today are not the sealed, low- or no-maintenance type. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

a. Technician A

Which of the following should be done to reduce the risk when working with batteries?

Select one:

a. Remove the positive battery cable first.

b. Charge batteries in a well-ventilated area.

c. Leave the booster on while servicing.

d. Create a low-resistance connection.

b. Charge batteries in a well-ventilated area.

Which of the following is NOT correct concerning grid corrosion?

Select one:

a. Grid corrosion takes place primarily in the negative grid and is accelerated by overcharging and high temperatures.

b. When corrosion takes place, grid resistance increases during charging and discharging.

c. Grids are the foundation and the electrical conducting layer for they battery plate.

d. Although grids are alloyed with antimony, calcium, or sometimes barium to minimize the corrosive effects of the electrolyte, grids do disintegrate

a. Grid corrosion takes place primarily in the negative grid and is accelerated by overcharging and high temperatures.

Temperatures higher than _____ speed up chemical activity inside a battery, accelerating the self-discharge of a battery.

Select one:

a. 39C

b. 29C

c. 19C

d. 49C

a. 39C

Technician A says battery terminals should be tight and show no evidence of overheating. Technician B says always coat battery terminals with chassis grease to prevent corrosion. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

a. Technician A

A fully charged lead-acid battery should have an open-circuit voltage of _____ volts.

Select one:

a. 10.25

b. 12.65

c. 13.45

d. 14.65

b. 12.65

_____ chargers are recommended to recover sulfated batteries.

Select one:

a. Constant-voltage

b. Pulse

c. Taper-current

d. Intelligent

b. Pulse

When charging above 2.35 volts per cell, or 14.1 volts for a 12-volt, flooded lead-acid battery, it begins to gas, which means _____.

Select one:

a. The battery can be charged at even lower rate, but the planes and electrolyte begin to cool.

b. An initial fast charge lasting for a few hours uses a charging voltage.

c. Water in the electrolyte is broken down into hydrogen and oxygen has through electrolysis.

d. The batteries need to be isolated, if they are connected in a bank, so they can be individually tested.

c. Water in the electrolyte is broken down into hydrogen and oxygen has through electrolysis.

Technician A says that the low-voltage disconnect (LVD) systems disconnect a battery load when the voltage of the battery falls below a present threshold. Technician B says that the LVDs are tested by varying the amount of input voltage around the threshold settings. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

Technician A says disposal is a critical issue at the end of every battery’s service life. Technician B says batteries contain many environmentally damaging chemicals and toxic copper. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

a. Technician A

Technician A says that the jump cables from the battery can be disconnected when charging or jump-starting. Technician B says that sparks occur when the battery is disconnected and can result in battery explosions. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

b. Technician B

Technician A says an explosive gas mixture consisting of hydrogen and nitrogen is produced during charging and discharging of the battery. Technician B says always remove the positive terminal first when disconnecting battery cables. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

d. Neither Technician A nor Technician B

Technician A says batteries should be fully charged to perform properly and prolong their service life. Technician B says a weakened battery causes the alternator to work harder charging batteries and shortens its life. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

Never set a wrench or other tool on a battery, as doing so can cause _____.

Select one:

a. Shorted battery terminals

b. Sulfation

c. An explosion in an alarmingly long period

d. Sparks that may extinguish the explosive gas mixture

a. Shorted battery terminals

Sulfation occurs when batteries are subjected to prolonged _____ conditions.

Select one:

a. Overcharged

b. Undercharged

c. No-charge

d. Fast charge

b. Undercharged

A battery losing more than _____ of its capacity is considered defective and should be replaced.

Select one:

a. 30%

b. 20%

c. 15%

d. 10%

b. 20%

Technician A says battery failures are by far the leading cause for service break-downs, with tires being the next most common failure. Technician B says the two most common complaints concerning batteries are that they will either not charge or not hold a charge. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

c. Both Technician A and Technician B

By touching one voltmeter lead to the terminal post and dipping the other lead in each cell’s electrolyte, a successive increase of _____ volts should be observed in each cell after the first cell.

Select one:

a. 2.1

b. 1.15

c. 3.25

d. 2.35

a. 2.1

To correct for temperature effects on SpGr when using a hydrometer, add or subract 4 points to the reading either above or below _____ for every 10F temperature change.

Select one:

a. 80F

b. 20F

c. 70F

d. 60F

a. 80F

Technicians use hydrometers and _____ to measure the specific gravity of the electrolyte in the battery during a SOC test.

Select one:

a. Refractometers

b. Voltmeters

c. Hygrometers

d. Dynamometers

a. Refractometers

_____ chargers are DC power supplies that use a step-down transformer and a rectifier

Select one:

a. Constant-voltage

b. Pulsed

c. Taper-current

d. Intelligent

a. Constant-voltage

A flooded lead-acid battery should not be charged when charging voltage exceeds cell voltage of _____ volts.

Select one:

a. 2.15

b. 1.15

c. 3.15

d. 4.15

a. 2.15

While connecting lead to jump-start commercial vehicles, Technician A says that the first step is to connect the red jumper lead to the positive terminal of the charged battery. Technician B says that the first step is to connect the red jumper lead to the positive terminal of the discharged battery in the vehicle you are trying to start. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

b. Technician B

Technician A says the conductance test determines the ability of a battery to deliver cranking amperage and is based on the battery CCA rating. Technician B says that during a load test, only one-fourth the CCA rating is applied as an electrical load for 15 seconds. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

d. Neither Technician A nor Technician B

Which of the following is one of the steps to measure parasitic draw on a battery?

Select one:

a. Disconnect the vehicle circuit fuses one at a time to isolate the source of excessive parasitic current draw.

b. Research the parasitic draw specifications in the appropriate service information system for the vehicle with a suspected parasitic, key-on excessive current draw.

c. Connect the high-current amp clamp around the positive and negative battery cables.

d. Determine the necessary actions by comparing conventional current draws for the device against original equipment manufacturer specifications.

a. Disconnect the vehicle circuit fuses one at a time to isolate the source of excessive parasitic current draw.

In the LVD systems, the voltage threshold is normally set between _____ and _____ volts.

Select one:

a. 12.2, 12.4

b. 13.2, 13.4

c. 11.2, 11.4

d. 15.2, 15.4

a. 12.2, 12.4

Technician A says to consult the manufacturer’s service information to determine the maximum allowable parasitic current draw and the time period, after the ignition is turned on, that it takes the modules to go to wake up. Technician B says that if excessive parasitic draw is measured, connect fuses or systems one at a time while monitoring parasitic current draw to determine the systems causing the excessive draw. Who is correct?

Select one:

a. Technician A

b. Technician B

c. Both Technician A and Technician B

d. Neither Technician A nor Technician B

d. Neither Technician A nor Technician B

Which of the following is NOT correct concerning low-voltage disconnect (LVD) systems?

Select one:

a. Low-voltage disconnect (LVD) systems disconnect a battery load when the voltage of the battery falls below a preset threshold.

b. LVD systems protect the battery from being excessively discharged.

c. The voltage threshold is normally set between 12.0 and 12.2 volts.

d. Once the battery voltage rises above the set threshold, as it does when the vehicle starts and the alternator commences charging, the load is reconnected automatically.

c. The voltage threshold is normally set between 12.0 and 12.2 volts.