1407: Chapters 5-8

How much of a change in specific gravity readings does temperature compensation involve for every 10 degrees?

0.004

When using a battery starter tester to make a battery load test, turn the control knob to draw battery current at a rate equal to which of the following?

1/2 of the battery's cold cranking amps rating

How many volts can each cell of an automobile battery produce?

2.1 volts

A 450 cold cranking amperage battery is being load tested. What will the correct load be?

225 amps

How long can an automotive battery with a cold cranking rating of 380 deliver 380 amperes?

30 seconds at 0 degrees F

Technician A says the flasher uses a bimetallic strip to open and close the turn signal circuit. Technician B says the dimmer switch is a part of the turn signal circuit. Who is correct?

A only

Technician A says an LED brake light illumination time is much more than a conventional incandescent bulb. Technician B says LED lighting has an extended life span when compared to standard bulbs. Who is correct?

B only

Technician A says composite headlights do not have replaceable bulbs. Technician B says composite headlights with broken lenses will continue to operate. Who is correct?

B only

Technician A says the flasher is at fault when the turn signals work in one direction, but the indicator light stays on steadily in the other direction. Technician B says this condition may be caused by a burned out light bulb. Who is correct?

B only

Technician A says the regulator is the cause if full fielding with the regulator bypassed produces lower than specified output. Technician B says a full field test will isolate the problem if it is in the AC generator or the regulator. Who is correct?

B only

Technician A says when replacing a composite headlight bulb, it is ok to touch the glass envelope with your fingers. Technician B says when replacing a composite headlight bulb, extreme care must be taken so as not to touch the glass envelope with your fingers. Who is correct?

B only

Technician A says when testing the charging system, the state of charge of the battery is not a concern. Technician B says the battery must be checked first before testing the charging system. Who is correct?

B only

The battery of a vehicle has "died" three days in a row. Each day the customer was able to start the car after he charged the battery. He was then able to drive the car 150 miles, but the next morning the battery was again discharged. A battery current drain test revealed a 10 mA drain. Technician A says the current drain is excessive and it could be the source of the problem. Technician B says that further testing is required, but it is possible that the battery may need to be replaced. Who is correct?

B only

The charging system of a vehicle is producing 100 amps and 12.4 volts at 1500 RPM with all electrical accessories turned "on." The charging system output specification for this vehicle is 110 amps. Technician A says the alternator needs to be replaced. Technician B says the electrical demand of the vehicle may be exceeding the capacity of the charging system. Who is correct?

B only

The condition of a battery cable end (where it connects to the battery post) is questionable. Technician A says a battery leakage test will determine the quality of the connection. Technician B says a battery terminal voltage drop test can be used to determine the quality of the connection. Who is correct?

B only

What are the only white lamps allowed on the rear of a car?

Backup lamps and license plate lamps

Technician A says a full fielding test should be performed only if the charging system fails the output test. Technician B says the field windings are constantly energized with full battery current during full fielding. Who is correct?

Both

Technician A says a poor ground on one of the headlamps will cause it to be dim. Technician B says AC generator output that is too high can cause headlights to be brighter than normal. Who is correct?

Both

Technician A says before performing a voltage output test, a visual inspection and preliminary check of the charging system should be done. Technician B says a voltage output test will indicate if the charging system is working properly. Who is correct?

Both

Technician A says during a load test, the battery voltage must not fall below 9.6 volts. Technician B says the load applied should be half the cold cranking amp rating. Who is correct?

Both

Technician A says speeding up the armature will result in decreased amperage draw. Technician B says slowing down the starter armature will result in increased amperage draw. Who is correct?

Both

Technician A says the neutral safety switch can apply a ground to the starter relay. Technician B says the neutral safety switch can also control the back-up lights on a vehicle. Who is correct?

Both

What type of voltage is the output at the "Bat" terminal of the AC generator?

DC

What is the principle cause of battery water loss?

Evaporation due to the heat of charging current

Slower-than-normal speed and higher-than-normal cranking amperage is usually the result of internal starter problems.

False

What should be done to the system when a 0.7 volt drop is observed between the battery positive terminal and the starter solenoid with the engine cranking?

Replace the cable or component between the voltmeter leads

Why should specific gravity readings be temperature compensated?

They are a more accurate indicator of the actual state of charge

In the ISG how does current flow to make the system perform as a starter?

Through the stator windings which generate magnetic fields in the rotor, causing the rotor to turn the crankshaft

Technician A says a fully charged battery will not freeze as easily as a discharged one. Technician B says the specific gravity of a fully discharged battery is around 1.100. Who is correct?

both

Technician A says a scan tool may be used to full field some alternators. Technician B says a field current draw test indicates if there is current available to the field windings. Who is correct?

both

Technician A says excessive resistance in the common portions of the circuit could cause both headlights to be dim. Technician B says low AC generator output could be the cause of dim headlights. Who is correct?

both

Technician A says increasing the amount of current flowing through a conductor will increase the strength of its magnetic field. Technician B says coiling a wire around a soft iron core will increase the strength of its magnetic field. Who is correct?

both

Technician A says the current capacity rating of a battery depends on the types of materials used in the construction of the battery. Technician B says the amount of electrical energy that a battery is capable of producing depends on the size, weight, and active area of the plates. Who is correct?

both

Technician A says the fastest check when only one bulb in the circuit is not operating, is to replace it with a good one. Technician B says start the diagnostic tests at the easiest location to access. Who is correct?

both

Technician A says when testing, the ground side voltage drop should be less than 0.2 volt. Technician B says the total insulated system drops should be less than 0.7 volt. Who is correct?

both

The "bulb failure" warning light of a vehicle is illuminated whenever the headlights are turned on. Technician A says this can be caused by an excessive voltage drop on the ground circuit of one of the headlamps. Technician B says excessive resistance in the left low beam circuit could cause the warning light to be on. Who is correct?

both

What are nonelectronic turn signal flasher units acting like when they supply a rapid on-off-on current flow to the turn signal lamps?

circuit breakers

Technician A says a shorted diode may be indicated by a whining noise. Technician B says a squealing noise may indicate a loose belt. Who is correct?

neither

To assist in headlight aiming, most sealed beam lenses use

aiming pads

Technician A says a full battery test series should be done before testing the starting system. Technician B says the internal condition of the engine has little effect on the operation of the starting system. Who is correct?

A only

Technician A says diodes are used in the center high mounted stop light (CHMSL) circuit for proper turn signal operation. Technician B says diodes are used in the center high mounted stop light (CHMSL) circuit to prevent radio static when the brake light is activated. Who is correct?

A only

Technician A says the commutator is a series of conducting segments located around one end of the armature that come in contact with the brushes. Technician B says the armature is the stationary component of the motor that consists of a conductor wound around a pole shoe. Who is correct?

A only

Technician A says the two windings of the solenoid are called the pull-in and the hold-in windings. Technician B says both windings of the solenoid are continually energized any time the ignition switch is in the start position and the starter motor is spinning. Who is correct?

A only

The charging system of a vehicle equipped with an on-board computer-controlled charging system is undercharging. A lab scope connected to the ground side of the alternator field indicates a 90 percent duty-cycle. Technician A says the alternator may need to be replaced. Technician B says the on-board computer may need to be replaced. Who is correct?

A only

The right headlight does not function on either high or low beam. Technician A says this could be caused by an open ground on the right side. Technician B says the B+ to the dimmer switch might be open. Who is correct?

A only

The ring gear teeth of a flywheel are badly worn in various spots. Technician A says this could cause poor drive gear engagement. Technician B says this could cause a lower-than-normal starter current draw. Who is correct?

A only

When there is no current draw and the starter does not rotate, the cause could be

All of the above

Which of the following statements is true concerning headlight circuits?

All of the above

Which of the following statements is true of solenoids?

All of the above

How may batteries be rated?

Any of the above

A vehicle is being checked for a no-crank condition. A voltmeter placed across the contacts of the starter solenoid indicates 12 volts when the ignition is turned to the "start" position. A distinct "click" noise is heard coming from the solenoid at the same time. Technician A says the starter motor may have an open armature or field current. Technician B says the starter solenoid needs to be replaced. Who is correct?

B only

A neutral safety switch will have continuity through it when the transmission is in drive or reverse.

False

A tighter-than-normal engine will decrease the amperage draw of the system.

False

Why should an AC generator never be operated open-circuit?

It could burn out electric components

Which of the following statements is NOT true of a replacement battery?

It may have a lower rating than the original battery

How is a three-bulb taillight system wired?

It uses separate bulbs for turn signals and brake lights

The taillights of a vehicle are dimly illuminated whenever the brake lights are on. Technician A says this could be caused by a blown fuse. Technician B says an open ground circuit could cause this problem. Who is correct?

Neither

A 100amp AC generator produces 105 amperes all the time. Full fielding it produces 105 amperes also. What does this indicate?

The regulator is running the AC generator full field all the time

Which of the following represents the correct sequence of steps that may need to be performed when testing a starting system?

Visual inspection, battery condition, starter draw, voltage drop

All of the following could prevent a starter solenoid from engaging, EXCEPT

a bent armature shaft

A ground circuit voltage drop test taken on a vehicle's alternator indicates a 0.965V drop. Technician A says this could cause a problem in the alternator's field current. Technician B says this could affect the output circuit of the alternator. Who is correct?

both

Technician A says a 12.6-volt open circuit voltage reading indicates a fully charged battery. Technician B says a hydrometer reading of 1.265 indicates that a battery cell has the proper electrolyte specific gravity. Who is correct?

both

Which of the following is NOT used to control the brightness of the instrument panel lamps?

diodes

What does increasing the regulator field resistance mean?

more output current is desired

Technician A says when testing the voltage output, if the charging voltage is too high, the cause could be a open field wire from the regulator. Technician B says a loose or glazed drive belt could be the cause of too high charging voltage. Who is correct?

neither

The starting safety switch is also called a

neutral-start switch

Which of the following is an indication of how well a battery would perform if the charging system of a vehicle failed?

reserve capacity

How many output diodes does an AC generator stator with three windings usually have?

six

The overrunning clutch protects the armature from

spinning too fast

Battery electrolyte is a mixture of water and what other element?

sulfuric acid

What component carries the magnetic field current in an AC generator?

the rotor

Where is the output of an AC generator created?

the stator

Which of the following is NOT true of automatic headlamp systems?

they are easily repaired when defective

At the end of a three-minute charge test, the voltage reading for a satisfactory 12-volt battery should not exceed how many volts?

15.5 volts

The overrunning clutch accomplishes which of the following?

All of the above

What components make up the AC generator field circuit?

Battery, rotor, and regulator

Which of the following statements about NiMH cells is NOT true?

Nickel-metal hydride batteries have an anode electrode that contains nickel hydroxide.

What device(s) is (are) used to rectify current in an AC generator?

diodes

At 80 degrees F, what is the correct specific gravity of electrolyte in a fully charged battery?

1.265