Electrical System and Repairs

Which of the following is an electronic relay? A. A diode B. A transistor C. Both A and B D. Neither A nor B

a

AC generator output is ________________ phase A. Single B. Two C. Three D. Four

b

All of the following are true about battery conductance testing EXCEPT: A. It is fast way to test a battery to see is it can conduct current B. It is better than hydrometer and carbon pile testing at determining battery condition C. The test sends a small current through the battery and the amount of alternating response is measured D. It can detect short and open circuits in cells

b

Before charging a deep-cycle battery, the electrolyte level should be: A. Just above the top of the plates B. Just below the top of the plates C. Even with the split ring in the fill opening D. There should be no electrolyte in the battery

b

Extra resistance in a voltage regulator circuit will cause the battery to have _______________ normal charging voltage A. Higher than B. Lower than C. Half D. None of the above

b

Which wire to a charging system component can start a fire if it grounds out? A. The voltmeter B. The ammeter C. Both A and B D. Neither A nor B

b

Which of the following is another name for a solenoid-type starter? A. Bendix B. Overrunning clutch C. Both A and B D. Neither A nor B

d

Acceptable charging circuit voltage is between 13.5 and 15.2 volts. True or false?

true

Technician A says that FM radio is subject to a higher amount of interference than AM radio. Technician B says that the range of the AM broadcast is restricted to "line-of-sight" distances. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

a

Technician A says that batteries are rated by cold cranking amperage. Technician B says that a battery can be rated according to its reserve capacity. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

a

What allows an AC generator to put out direct current? A. A rectifier B. Diodes C. Both A and B D. AC generators put out alternating current only

a

What is the name of the part of the starter where the brushes ride? A. The armature B. The commutator C. The solenoid D. The overrunning clutch

a

All of the following are true about battery posts EXCEPT: A. They are labeled + or - B. The negative battery posts is larger than the negative post C. They are made of lead, which oxidizes when exposed to air D. They can be on the side or top of the battery

b

All of the following are true about electrical systems EXCEPT: A. Direct current (DC) is used in automobile electrical systems B. Magnetic poles attract each other and unlike poles repel. C. Current flow is measured with an ammeter D. A diode is an electrical one-way check valve

b

Each of the following statements is true about adaptive cruise control EXCEPT: A. A brake switch signal shuts off the cruise control B. Adaptive cruise control can apply the brakes C. The distance sensor can see oncoming vehicles on narrow roads D. The distance sensor cannot detect animals

b

Technician A says that a good diode will allow electricity to flow freely in both directions. Technician B says that a diode can be ruined when soldering it to a wire. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

b

Technician A says that a voltmeter can be used to check resistance in a circuit. Technician B says that an ohmmeter can be used to check resistance in a circuit. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

b

Technician A says that disconnecting a battery on a computer-controlled car can result in a change in a car's driveability. Technician B says that a small battery is all that is needed to maintain computer memory. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

b

Technician A says that electric windows are powered by two switches wired in parallel. Technician B says that a problem with either the window switch or the master switch will prevent the window from operating. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

b

Which of the following could cause a battery cable to become hot when the engine is cranked? A. A cable is too large B. A cable is too small C. Using the wrong battery for a vehicle D. None of the above

b

Which of the following is/are true about starter brushes in a negative ground system? A. Positive starter motor brushes must be insulated to keep them from touching the starter housing B. Negative starter motor brushes must be insulated to keep them from touching the starter housing C. Both A and B D. Neither A nor B

b

All the following are true about gear reduction starters EXCEPT: A. They have a reduction of from 2:1 to 4:1 B. They take less current to operate C. They use larger battery cables D. They tent to be smaller and lighter than other starter designs

c

Technician A says that applying the wrong polarity (+ or -) to the field terminal can ruin diodes. Technician B says that connecting the wrong wire to the ground or hot lead can ruin diodes or a regulator. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

c

Technician A says that the battery ground cable is often black. Technician B says that black is negative and red is positive on all vehicles. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

c

Technician A says that window motors must be properly grounded in the door. Technician B says that the polarity of a window motor changes with the direction of current flow through its two wires. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

c

The engine is prevented from spinning the starter motor armature by: A. The flywheel B. The back flow preventer C. The overrunning clutch D. None of the above

c

Two technicians are discussing testing AC generator diodes while the generator remains installed on the vehicle. Technician A says to use a DMM. Technician B says to use a low-amp current probe. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

c

The vehicle's largest load on the battery is the _______________. A. Air-conditioning blower B. Horn C. Electric seats D. None of the above

d

Which of the following is/are true about AC alternator diodes? A. Three positive diodes will be mounted in a heat sink B. Three negative diodes will be pressed into the AC generator frame C. Both A and B D. Neither A nor B

d

Which of the following is/are true about digital meter? A. It has a needle on the dial, moved by a magnet B. It is a better choice for electrical circuit testing than an analog meter C. Both A and B D. Neither A nor B

d

Turning the AC generator rapidly on and off is called: A. Rapid cycling B. Pulse width modulation C. Ground side switching D. Alternating current

b

Voltage drop testing is done when: A. Current is flowing in the circuit B. The circuit power is off C. Either of the above D. None of the above

b

What can be used to neutralize battery acid? A. A base B. Baking soda C. Both A and B D. Neither A nor B

b

When an automobile battery is fully charged, a voltmeter connected to it while the key is off will register ________________. A. 12 volts B. 12.6 volts C. 13.8 to 14.2 volts D. None of the above

b

When attempting to start an engine, a starter with good circuit wiring makes a strong, SINGLE click. Technician A says that the solenoid electrical contacts are probably burned. Technician B says that a low battery could be the cause. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

b

Which of the following is/are true about voltage drop testing? A. The starter motor is allowed more of a drop in voltage than the rest of the starting circuit B. Voltage drop testing is used to diagnose a no-crank condition C. Both A and B D. Neither A nor B

b

Technician A says that battery terminal posts are made of lead. Technician B says that battery posts turn green when they oxidize. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

c

Which of the following would make the action of a started motor stronger? A. A stronger magnetic field B. Higher current flow in the conductor C. Both A and B D. Neither A nor B

c

All of the following are true about cruise control EXCEPT: A. Stepping on the brake or clutch will deactivate cruise control B. A driver-controlled switch can reinstate cruise control to the originally selected vehicle speed C. Adaptive cruise control uses radar or a laser sensor mounted near the rear bumper D. On some systems if the brake lights do not work, cruise control cannot operate

d

At what speed does an AC generator rotate? A. Crankshaft rpm B. Camshaft rpm C. Distributor rpm D. None of the above

d

Each of the following is true statement about cranking tests EXCEPT: A. During engine cranking the normal meter readings will be low voltage and high amperage B. Voltage drop indicates resistance in a circuit C. With a standard starter motor, cranking speed is typically about 250 engine rpm D. Low resistance in a battery connection can result in a hot battery cable

d

Technician A says that FM radios need the longest antenna possible. Technician B days that AM antennas should be exactly 31 inches (79 centimeters) long. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

d

Technician A says that a deep-cycle battery use more water than a battery that uses calcium as a plate-strengthening material. Technician B says that a maintenance-free battery will not discharge as much on the shelf as a deep-cycle battery. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

d

Two technicians are discussing the memory effect. Technician A says that NiCd batteries suffer from this. Technician B says that the memory effect becomes worse if a battery is not discharged completely before it is recharged. Who is correct? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

d

What is the name of the part that allows a generator to produce direct current output? A. Armature B. Stator C. Commutator D. None of the above

d

Where should the inductive pickup on a volt amp tester be clamped on the battery cable? A. As close as possible to the battery B. As far away from the battery C. Anywhere on the cable D. It should not be clamped on the battery cable

d

Which of the following is/are true about AC generator diodes? A. They rectify AC output to DC B. They prevent alternating current from leaving the AC generator in the B+ output wire C. If more than 0.5 AC volt is found in the B+ output, defective diodes are indicated D. All of the above

d

Which of the following is/are true about electric seats? A. Four-way seats usually have two motors B. Some six-way seats have one motor C. Some seats have eight motors D. All of the above

d

Technician A says that voltage is electrical pressure. Technician B says that amperage is electrical flow. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

c

Two technicians are discussing power seats. Technician A says that most vehicles use a fuse in the power feed to the seat. Technician B says that a four-way seat allows independent adjustment of the front or rear height of the seat. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

c

Two technicians are discussing starter solenoids. Technician A says that they have two separate windings. Technician B says that a neutral start switch prevents current from flowing to a solenoid unless the car is in the park or neutral. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

c

Which of the following can result from voltage that is too low? A. A light that is dim B. A heater defroster motor that spins slower C. Both A and B D. Neither A nor B

c

Which of the following is/are true about an engine that cranks slowly with cranking amperage lower than normal? A. There is too much resistance internally in the starter B. The starter will have to be removed from the vehicle for repair or replacement C. Both A and B D. Neither A nor B

c

Technician A says that a starter will draw half the amperage if the battery voltage drops to half. Technician B says that most V8 engines will draw about 50 amps during cranking. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

d

Technician A says that in a completely discharged battery, the positive and negative plates are the same material. Technician B says that in a fully charged battery, the positive and negative plates are the same material. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

d

Technician A says that storing materials on the shelf above the back seat can cause a hybrid vehicle to set a code and run in fail safe mode. Technician B says that green electrical wiring signifies high voltage. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

d

The stator winding that has three wires connected to each other at a common place in the middle is called a _________ winding. A. Delta B. Wye (Y) C. Primary D. Secondary

d

Two technicians are discussing tests for voltage and amperage. Technician A says that large test leads are for high amperage, as when load testing a battery. Technician B says that small test leads for reading voltage. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

d

Which of the following is/are true about resistance in an electrical circuit? A. A longer conductor will have more resistance B. A large diameter wire will have less resistance C. Resistance determines the amount of current that can flow in a circuit. D. All of the above

d

During a full field test, current output remains below the specification. Technician A says that a bad AC generator could be the cause. Technician B says that a bad drive belt could be the cause. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

a

Electrical loads are being added to a circuit. Technician A says that in a series circuit. current flow will be reduced. Technician B says that additional loads can overload a parallel circuit. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

a

Technician A says that a rheostat varies voltage through a circuit. Technician B says that a potentiometer varies the current flow in a circuit. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

a

Technician A says that the electrically conducting ends of the armature make up its commutator. Technician B says that an armature is made up of multiple loops of wire. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

a

Technician A says that when current is flowing though a resistance, the resistance will have the same voltage at each of its ends. Technician B says that if there excessive resistance in a circuit, a test light will be brighter. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

a

Two technicians are attempting to diagnose an engine being cranked with the headlights on. Technician A says that if the lights go out while cranking, the battery is weak. Technician B says that id the lights stay bright but the engine does not crank, there could not be high resistance or an open circuit. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

a

Which of the following is NOT an acceptable method of preventing the engine from starting during starter motor testing? A. Cranking the engine with the wire from the coil to the distributor disconnected B. Removing the fuel pump fuse C. Removing the ignition fuse D. Disconnecting the wiring harness connector to the coil

a

Which of the following is/are true about magnetic fields? A. Lead is a good insulator for magnetic fields. B. A magnetic field can be made stronger by coiling a current-carrying wire C. Both A and B D. Neither A nor B

a

A battery has one cell low on electrolyte. What would be the most probable cause? A. A voltage regulator allowing too high a charge rate B. A shortened cell C. A leak in the case D. All of the above

b

AC generator cooling fans are: A. ON the outside of the AC generator B. Enclosed within the AC generator housing C. Both A and B D. Neither A nor B

b

Technician A says that a battery gives off the most hydrogen when it is fully charged. Technician B says that the most hydrogen given off is when the battery is dead and beginning to charge. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

b

Technician A says that all brushes in an AC generator must be insulated. Technician B says that all diodes in an AC generator must be insulated. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

b

Technician A says that current must not be flowing in a circuit during a voltage drop test. Technician B says that when voltage drop through a circuit is low, resistance is high. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

b

Technician A says that it is rare for both from air bags to deploy together. Technician B says that at least two sensors must say there is a crash before an air bag will be deployed. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

b

Technician A says that some late-model AC generators cannot be full-fielded. Technician B says that some of today's charging systems are capable of very high current output, and forcing full output could damage the electrical system. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

b

Which of the following devices completes the circuit to a starter motor from the battery? A. The magnetic starter switch or relay B. The starter solenoid C. Both A and B D. Neither A nor B

b

Which of the following would NOT cause a solenoid to click repeatedly? A. A weak battery B. An open circuit in the solenoid hold-in winding C. A faulty neutral start switch D. None of the above

b

All of the following are true statements about jumper cables EXCEPT: A. Using jumper cables that are too small in diameter can prevent the engine from starting B. When the last connection is made there will be an arc C. On negative ground systems always connect the positive cable last D. It is usually a better choice to charge a battery first, rather than to jump it

c

Each of the following statements about antitheft systems is true except: A. Each key must be programmed to match the vehicle's computer before it will start the engine B. If a PCM is replaced the engine will not start unless the PCM is reset to match the transponder C. All manufacturers' antitheft systems disable the starter motor D. If an engine starts and runs for longer than 1 second, the antitheft system is not the cause of engine stalling

c

Technician A says that unlike charges attract and like magnetic charges repel. Technician B says that there is a stronger magnetic field on one side of a conductor in a motor. Who is right? A. Technician A B. Technician B C. Both A and B D. Neither A nor B

c