Electrical/Electronic Sys I Final Exam

A voltage drop over _____ volt(s) indicates high resistance in either the circuit or ground wiring of the charging system. 0.1 0.2 0.5 1.0

0.5

The maximum voltage drop for the insulated circuit [battery positive to starter solenoid] is typically about _____ volt. 0.02 0.06 0.2 0.6

0.6

How many volts are present in a fully charged 12-volt battery? a 12.0 b 12.2 c 12.4 d 12.6

12.6

If the field of a 100 amp, pulse width modulated AC generator [PCM controlled] is fed a 30% duty cycle, how much current will be produced at the generator output terminal? 0 amps 30 amps 70 amps 100 amps

30 amps

The usual minimum cranking voltage specification is ______ volts. 9.6 10.5 11.0 12.65

9.6

Checking for excessive resistance in the starting circuit is being discussed. Technician A says connecting a voltmeter across the ground cable from the battery to the ground connection of the cable is the preferred method. Technician B says connecting an ohmmeter across the positive battery cable after it has been removed from the vehicle is the preferred method. Who is correct? A only B only both A and B neither A nor B

A only

Oscilloscope patterns are being discussed; Technician A says an open or shorted diode can be detected by the waveform on a lab scope. Technician B says the waveform produced by the AC generator after the output moves through the diodes is a straight line because it is a constant DC voltage. Who is correct? A only B only both A and B neither A nor B

A only

Technician A says a starter no-load test is conducted with the starter in a bench vise. Technician B says the battery must have a minimum voltage of 9.6 volts during the test. Who is correct? A only B only both A and B neither A nor B

A only

Technician A says electrolyte is very corrosive. Technician B says electrolyte is a water and hydrochloric acid solution. Who is correct? A only B only both A and B neither A nor B

A only

Technician A uses a solution of baking soda and water to clean a battery. Technician B uses soap and water. Who is correct? A only B only both A and B neither A nor B

A only

Vehicle wiring schematics use which theory of current flow almost exclusively? A. Conventional theory B. Electron theory C. Gilbert theory D. Faraday theory

A. Conventional theory

The unit for measuring electrical current is _____. A. amperes B. ohms C. volts D. watts

A. amperes

In the formula V = A x R, A represents_____. A. current B. resistance C. voltage D. wattage

A. current

A cranking current test is performed, and the amperage is found to be less than specification. Technician A says the starter is bad and it should be replaced. Technician B insists on testing the resistance of the cables, grounds, and connections. Who is correct? A only B only both A and B neither A nor B

B only

PCM-controlled AC generators are being discussed. Technician A says the battery current sensor is located inside the AC generator. Technician B says the battery current sensor is a three-wire hall effect type sensor that connects to the PCM. Who is correct? A only B only both A and B neither A nor B

B only

Technician A says permanent magnet starter motors are more robust than electromagnetic field type motors and can better withstand being dropped. Technician B says permanent magnet motors can produce more torque using less electric current. Who is correct? A only B only both A and B neither A nor B

B only

Technician A says the specific gravity of pure water is 10.00 at 80 degrees Fahrenheit (27 degrees Celsius). Technician B says the specific gravity of electrolyte in a fully charged battery is between 1.260 and 1.280 at 80 degrees Fahrenheit (27 degrees Celsius). Who is correct? A only B only both A and B neither A nor B

B only

Voltage regulators are being discussed. Technician A says charging voltage is decreased when the battery temperature is low because the battery cannot accept high charging rates at low temperatures. Technician B says the voltage regulator increases the current flowing through the field coil when the battery voltage is low. Who is correct? A only B only both A and B neither A nor B

B only

How many volts are required to push 3 amps through a resistance of 4 ohms? A.1 volt B. 12 volts C. 7 volts D. 1 1/4 volts

B. 12 volts

A simple on/off switch with one input terminal and one output is a _____type switch. A. SPDT [single pole, double throw] B. SPST [single pole, single throw] C. DPDT [double pole, double throw] D. MPMT [multipole, multi throw]

B. SPST [single pole, single throw]

When a dead short occurs, what happens to circuit resistance? A. Increases to a dangerous level B. Significantly reduced C. Not affected D. Increases a small amount

B. Significantly reduced

The function of a resistor in an electrical circuit is to limit _____. A. voltage B. current [amperes] C. resistance [ohms] D. power [ watts]

B. current [amperes]

The unit for measuring electrical resistance is _____. A. amperes B. ohms C. volts D. watts

B. ohms

In the formula V = A x R, R represents_____. A. current B. resistance C. voltage D. wattage

B. resistance

All the following are variable resistors EXCEPT: A. potentiometer B. resistor wire C. rheostat D. thermistor

B. resistor wire

The electrical principle that states "the sum of the voltage drops in a closed circuit equals the voltage applied to that circuit" is known as _____ law. A. Ohm's B. Watt's C. Kirchoff's D. Ampere's

C. Kirchoff's

In the formula V = A x R, V represents _____. A. current B. resistance C. voltage D. wattage

C. Voltage

Which of the following is a source of energy in a vehicle's electrical system? A. battery B. AC generator C. both "battery" and "AC generator" D. neither "battery" nor "AC generator"

C. both "battery" and "AC generator"

The starter solenoid's function is to _____. A. push the drive pinion gear into engagement with the ring gear teeth B. act as a relay switch to energize the starter motor C. both "push the drive pinion gear into engagement with the ring gear teeth" and "act as a relay switch to energize the starter motor" D. neither "push the drive pinion gear into engagement with the ring gear teeth" nor "act as a relay switch to energize the starter motor"

C. both "push the drive pinion gear into engagement with the ring gear teeth" and "act as a relay switch to energize the starter motor"

Technician A says current will increase with a decrease in resistance. Technician B says current will decrease with an increase in resistance. Who is correct? A only B only C. both A and B neither A nor B

C. both A and B

Technician A says moving magnetic fields are a source of electrical energy in an automobile. Technician B says chemical reaction is a source of electrical energy in an automobile. Who is correct? A. A only B only Correct Answer both A and B neither A nor B

C. both A and B

A momentary contact switch is used to operate the _____. A. headlights [on/off] B. heater fan C. horn D. turn signals

C. horn

The unit for measuring electrical pressure (force) is _____. A. amperes B. ohms C. volts D. watts

C. volts

Calculate the electrical pressure required to flow 6 amps through a 2 ohm resistance A. 3 volts B. .33 volts C. 6 volts D. 12 volts

D. 12 volts

Which of these terms mean the same thing as Voltage? A. Charge differential B. Electromotive force C. You Answered Potential difference D. All of the above

D. All of the above

What is the name of the formula V = A x R? A. Ampere's law B. Voltaire's law C. Watt's law D. Ohm's law

D. Ohm's law

Which statement concerning series circuits is NOT true? A. The sum of the voltage drops equals the source voltage B. The amount of current [amperes] flowing through the circuit is the same throughout the circuit C. The voltage drop across each load is different if the resistance of the loads is different D. The total resistance is equal to the lowest resistance in the circuit

D. The total resistance is equal to the lowest resistance in the circuit

Which type of resistor is commonly used in vehicle and equipment circuits? A. fixed value B. stepped C. variable D. all answers are correct

D. all answers are correct

Technician A says when there is a complete path through the electrical circuit, the circuit is said to be open. Technician B says when the circuit path is broken or interrupted the circuit is said to be closed. Who is right? A. A only B. B only C. both A and B D. neither A nor B

D. neither A nor B

A _____ is an electromagnet with a movable core that converts electrical current into mechanical movement. A. stator B. magneto C. reluctor D. solenoid

D. solenoid

What components in the generator blocks or allows current flow depending on how it's configured? Wye windings Ballast Diodes Resistors

Diodes

A faulty voltage regulator can only cause a no-charge condition. True False

False

Which of the following precautions should be followed whenever working on or testing a charging system? Keep carbon pile off unless running tests Ground the alternator's output terminals Disconnect the positive side of the battery before servicing any parts All answers are correct

Keep carbon pile off unless running tests

All the following are good safety precautions to follow when charging batteries EXCEPT: Always wear safety glasses Make sure the area is well ventilated Never charge a frozen battery or one with damaged plates Never allow the charging voltage to exceed 12.6 volts

Never allow the charging voltage to exceed 12.6 volts

How can you identify the high-voltage system in most hybrid vehicles? Orange cables Green cables Blue cables White cables

Orange cables

A vehicle that has a low cranking RPM is being diagnosed. After checking the battery a cranking voltage test measures 9.1 volts at the starter solenoid terminal. What should be done next? Replace the starter Perform a cranking current test Check the voltage at the ignition switch Perform a charging system output test

Perform a cranking current test

Technician A says that if there was no output from the charging system until the AC generator was full-fielded, the voltage regulator is faulty. Technician B says that this indicates one or more leaking diodes in the generator. Who is correct? Tech A Tech B both A and B neither A nor B

Tech A

While discussing what is indicated by a vehicle's charge indicator: Technician A says that any positive reading on an ammeter shows that the generator is in working condition. Technician B says that if the voltmeter reading does not increase immediately after starting the engine, the battery is bad. Who is correct? Tech A Tech B both A and B neither A nor B

Tech B

A bad diode can cause an abnormal whirring noise in the AC generator. True False

True

What controls the amount of current going through the AC generator rotor field? Voltage regulator Current By-pass Armature Diodes

Voltage regulator

When the starter spins but does NOT crank the engine, which of the following may be a cause? a defective starter drive excessive resistance in the control circuit a faulty neutral safety switch all answers are correct

a defective starter drive

When load testing a battery, the load applied to the battery should be _____. a one half the CCA rating b the CCA rating c two times the CCA rating d two times the CA rating

a one half the CCA rating

A conductance tester measures the battery condition by _____. a sending a small AC signal through the battery and measuring the current response b applying a load of 125 amps on the battery and measuring how fast the battery voltage returns to 12.4 volts when the load is turned off c measuring how fast the voltage drops when a 100 amp load is applied d measuring the voltage drop between cells as a load is applied

a sending a small AC signal through the battery and measuring the current response

Corrosion on or near the battery must be minimized because _____. a..corrosion on the battery terminals increases resistance in the battery circuit b corrosion on the battery cover can create a path that will allow the battery to slowly discharge c corrosion can destroy the hold-down straps and battery tray d all answers are correct

all answers are correct

If a ground circuit test reveals a voltage drop of more than 0.2 volt, the problem may be a ______. loose starter motor mounting bolt poor battery ground terminal post connector damaged battery ground cable all answers are correct

all answers are correct

Which of these statements is NOT a true conclusion from a battery load test? a The battery needs to be replaced if the voltage dropped below 9.6 volts while under a load but rose above 12.4 volts when the load was removed b The battery should be charged and then retested because it dropped below 9.6 volts and didn't rise above 12.4 volts when the load was removed c The battery should be charged and then retested because it dropped below 9.6 volts and rose above 12.4 volts when the load was removed d The battery is good because the voltage dropped only to 10.3 volts while under load

b The battery should be charged and then retested because it dropped below 9.6 volts and rose above 12.4 volts when the load was removed

Battery overcharging may be caused by _____. a faulty vehicle charging system b improper use of a battery charger c both "faulty vehicle charging system" and "improper use of a battery charger" d neither both "faulty vehicle charging system" nor "improper use of a battery charger"

b. both "faulty vehicle charging system" and "improper use of a battery charger"

When charging a battery that has been completely discharged, the most important item to monitor is _____. gassing charging voltage charging current battery temperature

battery temperature

Which method of testing for battery state of charge (SOC) can be used on maintenance-free batteries? built-in hydrometer open circuit voltage test battery hydrometer both "built-in hydrometer" and "open circuit voltage test"

both "built-in hydrometer" and "open circuit voltage test"

Before adjusting drive-belt tension, Technician A checks for proper pulley alignment. Technician B looks up the specified belt tension in the vehicle's service manual. Who is correct? A only B only both A and B neither A nor B

both A and B

Technician A checks a starter's field coils for opens by connecting an ohmmeter between the coil's power feed wire and the field coil brush lead. Technician B checks a starter's field coil for a short to ground by connecting an ohmmeter from the field coil brush lead and the starter housing. Who is correct? A only B only both A and B neither A nor B

both A and B

Technician A says absorbed glass mat [AGM] batteries have spiral wound plates and never require water. Technician B says recombinant batteries use a gel-type electrolyte and convert oxygen and hydrogen back into water. Who is correct? A only B only both A and B neither A nor B

both A and B

Technician A says generator output should be within 10 amps of the AC generator's rated output. Technician B says generator voltage output should not exceed 14.5 volts during voltage output test. Who is correct? Tech A Tech B both A and B neither A nor B

both A and B

Technician A says increasing the strength of the magnetic field in an AC generator increases the voltage output. Technician B says the voltage regulator controls the strength of the rotor's magnetic field. Who is correct? A only B only both A and B neither A nor B

both A and B

Technician A says overcharging can overheat and damage the battery. Technician B says overcharging causes gassing that can cause the battery to lose water. Who is correct? A only B only both A and B neither A nor B

both A and B

Technician A says that side post terminals need to be removed to inspect them for corrosion. Technician B says that side post terminals can be damaged by overtightening the terminal bolt. Who is correct? Tech A Tech B both A and B neither A nor B

both A and B

Technician A says the charging system is needed to keep the battery fully charged and recharge the battery after starting. Technician B say the charging system supplies all the vehicle's electrical current needs after the engine starts. Who is correct? A only B only both A and B neither A nor B

both A and B

Technician A says the purpose of the solenoid is to engage the starter pinion into the flywheel's ring gear. Technician B says the solenoid energizes the starter motor by closing the electrical circuit from the battery to the motor. Who is correct? A only B only both A and B neither A nor B

both A and B

Technician A says the starter circuit carries high current from the battery to the starter motor. Technician B says the control circuit is a low current circuit that sends current from the ignition switch to the starter relay or solenoid. Who is correct? A only B only both A and B neither A nor B

both A and B

Technician A says the starter solenoid mounts directly on top of the starter motor. Technician B says the starter solenoid pushes the starter drive pinion into mesh with the flywheel teeth. Who is correct? A only B only both A and B neither A nor B

both A and B

Technician A uses a current output test to check AC generator output. Technician B uses a voltage output test to check output. Who is correct? A only B only both A and B neither A nor B

both A and B

Technician A uses a voltmeter to test the open circuit voltage of a battery. Technician B uses the results of an open circuit voltage test to determine the battery's state of charge. Who is correct? A only B only both A and B neither A nor B

both A and B

When checking AC generator output on a late-model vehicle: Technician A tests the battery's open circuit voltage before testing the generator's output because the battery's SOC will affect the maximum output of the generator. Technician B checks the ambient temperature before performing any tests because the generator's output will be affected by temperature. Who is correct? Tech A Tech B both A and B neither A nor B

both A and B

When checking the charging system on a late-model vehicle: Technician A connects a scan tool to monitor the system's voltage output. Technician B connects a scan tool to retrieve any DTCs that may be in the system. Who is correct? Tech A Tech B both A and B neither A nor B

both A and B

While diagnosing rapid and severe belt wear after generator replacement: Technician A says that a defective drive belt tensioner may be the cause. Technician B says that the generator may have the wrong type of pulley installed. Who is correct? Tech A Tech B both A and B neither A nor B

both A and B

While discussing armature testing, Technician A says to test for opens, check for continuity between segments of the commutator. Technician B says an ohmmeter can be used to test for shorts. Who is correct? You Answered A only B only both A and B neither A nor B

both A and B

A vehicle's battery goes dead after sitting for two days. Technician A says a thorough battery inspection should be performed. Technician B says a check for a parasitic draw should be performed. Who is correct? Tech A Tech B both Aand B neither A nor B

both Aand B

A cold-cranking amperes (CCA) rating specifies the minimum amperes available at _____ degrees Fahrenheit. a 50 b 32 c 0 d 50

c 0

What is the first step when removing an old battery? a Disconnect the positive cable b Remove the battery hold-down straps and cover c Inspect and clean the area d Remove the heat shield

c Inspect and clean the area

The two main components of the armature are the armature windings and the _____. field coil brush holder pole shoe commutator

commutator

Which of the following could result in a hard starting condition? corroded battery cables excessive CCA capacity heavy-gauge battery cables all answers are correct

corroded battery cables

If an electrical connection in a closed electrical circuit heats up, which of the following would be the more likely cause? a blown fuse wire gauge thickness too large corroded connectors overcharged battery

corroded connectors

The alternating current produced by the AC generator is rectified into DC, or direct current, through the use of ___. transistors electromagnetic relays diodes capacitors

diodes

Which of the following is NOT a common cause for premature battery failure? increased cycling sulfation excessive engine restarting overcharging

excessive engine restarting

Which of the following would NOT cause excessive current draw by the starter motor? a short in the starter motor excessive resistance in the battery cables high mechanical resistance due to engine problems misalignment of the starter drive

excessive resistance in the battery cables

Which of the following tests would be performed to check for high resistance in the positive battery cable? cranking voltage test insulated circuit resistance test starter relay bypass test ground circuit resistance test

insulated circuit resistance test

An engine cranks slowly. Technician A says a possible cause of the problem is low resistance in the starter circuit connections. Technician B says a possible cause is an open in the starter field coil circuit. Who is correct? A only B only both A and B neither A nor B

neither A nor B

Technician A says that the waveform produced by an AC generator after rectification is called a sine wave. Technician B says that the waveform produced by the AC generator after the output moves through the diodes is a straight line because it is a constant DC voltage. Who is correct? Tech A Tech B both A and B neither A nor B

neither A nor B

Technician A says when battery cells are connected together in series, the amperage increases. Technician B says when battery cells are connected together in parallel, the voltage increases. Who is correct? A only B only both A and B neither A nor B

neither A nor B

While the engine is cranked, a voltmeter placed between positive battery post and the positive post of the starter reads less than .01 volt. The cause of this reading could be ______. excessive resistance in the ground circuit normal resistance in the positive battery cable excessive resistance in the solenoid control circuit excessive resistance in the positive battery cable

normal resistance in the positive battery cable

The device that prevents the engine from turning the armature of the starter motor is the ______. overrunning clutch pinion gear flywheel pole shoe

overrunning clutch

The function of the overrunning clutch in the starter drive is to _____. allow the pinion gear teeth to engage the ring gear teeth if they don't initially align prevent damage to the ring gear and drive pinion if the driver accidentally engages the starter when the engine is running prevent damage to the armature if the starter stays engaged after the engine starts

prevent damage to the armature if the starter stays engaged after the engine starts

A technician connects the red lead of a voltmeter to the B+ [output] terminal of an AC generator and the black lead to the battery positive terminal. He starts the engine and turns on all the lights and electrical accessories. What is the technician measuring? resistance in the positive side charging system cables diode leakage charging voltage charging current

resistance in the positive side charging system cables

When replacing a starter drive that has chipped pinion gear teeth what else must be checked before the starter is installed? ignition switch starter solenoid starter relay ring gear teeth

ring gear teeth

Which part of the AC generator produces the moving magnetic field? stator rotor brushes poles

rotor

Which of the following components is not part of a battery cell? positive electrode negative electrode electrolyte solenoid

solenoid

The pull-in winding and hold-in winding are part of the _____. starter field coil assembly starter solenoid armature winding starter safety switch

starter solenoid

When checking AC generator output using an oscilloscope, the correct pattern resembles ______. the rounded tops of a picket fence a square sine-wave pattern a square wave a sawtooth wave

the rounded tops of a picket fence

The best way to test battery cables and terminal for excessive resistance is by _____ testing. ohmmeter voltage drop ammeter [conventional] inductive ammeter

voltage drop