AET233 Quizzes (Modules 1-5)
A battery cable problem produces symptoms similar to each of the following except:
Brush Holder Problem
Which configuration has stator wires connected end to end?
Delta Type Stator
An automotive battery produces:
Direct Current
Which injector problem can create a lean air-fuel mixture?
Dirty Injector
Battery charging converts:
Electrical Energy Into Chemical Energy
Which of the following is used to warm air to help start a cold diesel engine?
Glow Plugs
Each of the following is an engine lubrication system function except:
Helps Cool Engine Parts
Which of the following can be used to block current flow to an electric fuel pump after a severe collision?
Inertia Switch
The spring-loaded valves that spray fuel into each combustion chamber are called:
Injector Nozzles
A computer-controlled diesel system uses all of the following components to increase efficiency, except:
Linkage
In which fuel injection system is gasoline sprayed into the top center of an intake manifold?
Throttle Body
All of the following are basic components of a turbocharger, except:
Transfer Pump
Each of the following is a radiator component except:
bypass valve.
When fully charged, an automotive battery has:
12.6 Volts
Charging system voltage is approximately:
13-15 Volts
Power is transferred from the engine to the injection pump using a:
Any Of The Above
Technician A says a variable resistor sensor opens or closes the sensor circuit to provide an electrical signal for the computer. Technician B says a variable resistor sensor changes its internal resistance with a change in a condition. Who is right?
B Only
Diesel engine compression ratio is about:
17:1 To 25:1
An engine's operating temperature is usually between:
180°F and 210°F.
A 12-volt automotive circuit has a current of 3 amps. Technician A says the electric power in this circuit is 36 watts. Technician B says the electric power in this circuit is 4 watts. Who is right?
A Only
Technician A says coils are usually wrapped around an iron core. Technician B says coils block direct current flow. Who is right?
A Only
Which of the following is not a function of a radiator cap?
Absorb Heat
Oil " viscosity" refers to a motor oil's:
All Of The Above
Oil additives are used to prevent:
All Of The Above
When working on charging systems, all of the following precautions should be taken except:
Always Polarize The Alternator
What is the best way to be trained to service a specific HV charging system?
Attend factory Or Manufacturer Classes And Read Their Service Instructions
Technician A says the term "cybernetics" refers to the study of how chemical-mechanical devices can duplicate the action of the human body. Technician B says the term "cybernetics" refers to the study of how electrical-mechanical devices can duplicate the action of the human body. Who is right?
B Only
Technician A says the term "gate" refers to an electronic circuit that stops current from flowing in a particular direction. Technician B says the term "gate" refers to an electronic circuit that produces a specific output voltage for given input voltages. Who is right?
B Only
The HV starting system in a hybrid vehicle will not crank the engine for starting. Technician A says the problem could be caused by a faulty HV power control module. Technician B says the problem could be caused by a faulty hybrid control module. Who is right?
Both A & B
When performing fuel tank repairs, Technician A believes, for safety reasons, leaks should never be mended by welding or soldering. Technician B agrees, but says any fuel tank leak repair should be handled strictly by a specialist. Who is right?
Both A & B
A metallic grinding noise can be caused by each of the following except:
Broken Main Feed Wire
Which of the following engine types does not use a throttle valve to control airflow into the engine?
Diesel
When removing a starter motor, which of the following should be done first?
Disconnect The Battery
Which of the following memories can be altered in the field to adjust for operating parameters?
EEPROM
A mechanical fuel pump is powered by a(n):
Eccentric
A faulty fuel pressure regulator can cause:
Either A Or B
All of the following are photonic devices except:
Field-Effect Transistors
All of the following are wire protection devices except:
Flux
A properly burning spark plug should be:
Grayish-Tan
A cooling system pressure tester is a(n):
Hand Operated Air Pump
Which of the following is not a problem that can be caused by bad spark plugs?
High Idle Speed
Crude oil is used to make each of these except:
Hydrogen
Overcooling may be caused by each of these except:
Ice In Coolant
Which of the following is not a type of alternator belt?
Integrated
Which of the following tools measures voltage over time?
Oscilloscope
Which of these is a commonly used antiknock additive?
Oxygenates
Each of these is a hose problem that may affect cooling system performance except:
Shrinking
Which of the following spark plug components causes electricity to jump the gap and return to the battery through frame ground?
Side Electrode
Which of the following is not a common indicator that an engine is overheating?
Slow Engine Warm Up
Which of the following uses a small current flow from the ignition switch to control a larger current flow to the starter solenoid?
Starter Relay
Which of the following converts electrical energy from the battery into mechanical or rotating energy to crank the engine?
Starting Motor
A chemically correct air-fuel ratio is called a:
Stoichiometric Fuel Mixture
Which of the following system parts controls coolant flow through a radiator?
Thermostat
Pressure-fed oiling is provided by the oil pump to each of the following except:
Timing Chain
Each of these is an electric rotary fuel pump except:
Vacuum
When bubbles form in overheated fuel and prevent fuel flow, it is called:
Vapor Lock
Which of the following is not a typical electronic spark advance ignition system sensor?
Vehicle Height Sensor
The electrical pressure that causes current is known as:
Voltage
Antifreeze serves each of these functions except:
control engine temperature.
One milliamp is equal to:
.001 Amp
Normal combustion takes about:
3/1000 Of A Second
Automakers recommend a cetane rating of about:
45
Each of these is a form or result of abnormal combustion except:
Ignition Lag
Which of the following is not a component of a typical 12-volt charging system?
Ignition Switch
When water, antifreeze, and oil mix, it turns:
Milky White
Which of the following components do hybrid vehicles use to recharge the HV battery?
Motor Generator
As a supercharger intercooler system is pressure tested, the engine begins to run rough and white smoke can be seen coming out of the tailpipe. Technician A says that the cylinder head may be cracked. Technician B says that the problem may be caused by bent cooling fins on the intercooler. Who is correct?
Neither A Nor B
Which of the following is the measurement of a fuel's ability to resist knock?
Octane Rating
A water pump normally mounts:
On The Front Of The Engine
A direct ignition system uses:
One Coil Per Spark Plug
A faulty engine fan may cause each of these engine problems except:
Revving
Technician A believes that once an engine starts running, the engine crankshaft pulley powers the alternator to supply electricity to a car's electrical systems. Technician B feels a battery is a car's sole electrical supplier. Who is right?
A Only
Technician A says a fuel heater is used to prevent diesel fuel from gelling. Technician B says all diesel engines have fuel heaters. Who is right?
A Only
Technician A says if an automotive computer system detects an abnormal condition, the car's malfunction indicator light will normally be activated. Technician B says if an automotive computer system detects an abnormal condition, the car's low oil warning light will normally be activated. Who is right?
A Only
A discharged 12-volt battery can be caused by a(n):
All Of The Above
Which of the following provides voltage to the battery and ignition system after an engine is running?
Alternator
Each of these is a common 12-volt charging system test except:
Alternator Mounting Test
Which type of bearings use balls or rollers?
Antifriction
A pressure relief valve can be located in the:
Any Of The Above
An automobile has a small fuel tank leak. Technician A says this problem may activate the car's computer system "malfunction indicator light." Technician B says this type of problem has no effect on the car's computer system. Who is right?
B Only
A loud growling noise can be heard coming from the supercharger. Technician A says that the noise may indicate rotor bearing failure. Technician B says that the noise may indicate drive gear teeth breakage. Who is correct?
Both A & B
A scan tool indicates a problem with the MAP sensor. Technician A says you should check the operating condition of the MAP sensor. Technician B says you should check for poor electrical connections in the system. Who is right?
Both A & B
A turbocharged vehicle has a severe detonation problem. Engine power is good and initial ignition timing is within specifications. Technician A says that the trouble could be in the knock sensor. Technician B says the waste gate could be stuck closed. Who is correct?
Both A & B
Technician A says that a variable resistance sensor can be tested with an ohmmeter. Technician B says that a variable resistance sensor can be tested with a voltmeter. Who is right?
Both A & B
While discussing oil pump drive methods, Technician A says an oil pump can be directly engaged to and powered by the crankshaft snout. Technician B says an oil pump can be driven by a cogged belt. Who is right?
Both A & B
While discussing thermostat service, Technician A says a stuck thermostat can cause engine overheating. Technician B says a stuck thermostat can cause engine overcooling. Who is right?
Both A & B
When a thermostat is closed, which of these permits coolant circulation through the engine?
Both Of The Above
Which of the following serves as a sliding electrical connection between motor windings and brushes?
Commutator
When a diode is forward biased, it acts like a(n):
Conductor
Which of the following is not one of the three fuel system subsystems?
Cooling System
Technician A says an oscilloscope can be used to check ignition system operating voltages. Technician B says an oscilloscope can be used to check output signals from computer system sensors. Who is right?
Both A & B
A particular type of resistor has a tolerance of 3%. Technician A says this indicates that the resistor's current value can be 3% above or below its stated specification. Technician B says this indicates the resistor's resistance value can be 3% above or below its stated specification. Who is right?
B Only
Technician A says a rheostat has at least three electrical connections. Technician B says a potentiometer has at least three electrical connections. Who is right?
B Only
Technician A says dc circuits are not normally used in automotive circuits. Technician B says certain automotive computer sensors use ac. Who is right?
B Only
Technician A says electrons and protons form the nucleus of an atom. Technician B says electrons have a negative charge. Who is right?
B Only
Technician A says soldered connections have high resistance. Technician B says solder has a relatively low melting point compared to other metals. Who is right?
B Only
Technician A says that a good hybrid HV battery should show a voltage reading of almost 100% of maximum charge. Technician B says that most hybrids only charge their battery packs to about 80% of maximum charge. Who is correct?
B Only
Technician A says that a soldering gun is generally better suited to delicate work on circuit boards than a soldering iron. Technician B says using a soldering torch heats up faster than a soldering iron. Who is right?
B Only
Technician A says that the best way to splice a broken wire is to use a crimp connector. Technician B recommends soldering. Who is correct?
B Only
Technician A says that you should never put any kind of grease on HV power cable connections. Technician B says that dielectric grease prevents electrical corrosion and the resulting bad connections that can burn up cables and components. Who is right?
B Only
Technician A says the term hot wire refers to the section of the circuit after the load or electric device. Technician B says the ground wire refers to the section of the circuit after the load or electric device. Who is right?
B Only
Test light use is being discussed. Technician A says that self-powered test lights are the most common type of test light used in automotive repair. Technician B says that you should avoid using a test light probe to puncture wire insulation whenever possible. Who is right?
B Only
When testing a battery's charge condition, the indicator shows a visible dark green dot. Technician A interprets this to mean the battery needs to be charged. Technician B feels the dot indicates the battery is fully charged. Who is right?
B Only
A diesel engine has a possible dead cylinder. Technician A is going to use a magnetic timing meter to check this problem. Technician B is going to use a glow plug harness tester to check for a possible dead cylinder. Who is right?
Both A & B
A wire has come loose from an automotive component. Technician A says the tip of the soldering gun should be tinned before the wire is soldered. Technician B says the wire and the component lead should be preheated before melting solder onto the joint. Who is right?
Both A & B
An automobile is brought into the shop with an engine electrical problem. Technician A says the first step to electrical diagnosis is to verify the symptoms and the problem. Technician B says electrical diagnosis involves using a logical sequence of steps to find the source of the problem. Who is right?
Both A & B
One of an automobile's fuse links is burned. Technician A says the circuit problem should be identified and corrected before the link is replaced. Technician B says the battery cable should be disconnected before the link is replaced. Who is right?
Both A & B
Technician A says a capacitor blocks dc current and is commonly used as a noise suppressor for automotive radios. Technician B says a capacitor has the ability to store electrical energy. Who is right?
Both A & B
Technician A says a change in circuit resistance will change the amount of current in the circuit. Technician B says a change in circuit voltage will change the amount of current in the circuit. Who is right?
Both A & B
Technician A says a circuit breaker is designed to protect a circuit from high current. Technician B says a circuit breaker's rating is given in amps. Who is right?
Both A & B
Technician A says a load tester can be used to check the condition of a vehicle's battery. Technician B says a load tester can be used to check the condition of a vehicle's starting system. Who is right?
Both A & B
Technician A says a mercury switch can be used to activate the underhood light in a vehicle. Technician B says a pressure switch can be used in the engine oil light circuit. Who is right?
Both A & B
Technician A says a motor-generator armature can be attached directly to the engine crankshaft. Technician B says that a motor-generator armature can be connected to the engine through the transmission or transaxle for engine starting. Who is right?
Both A & B
Technician A says a neutral safety switch prevents the starting system from operating when the transmission is in gear. Technician B says the neutral safety switch is often wired into the same control circuit as the brake light switch. Who is right?
Both A & B
Technician A says a semiconductor can act like an insulator. Technician B says a semiconductor can be used as a conductor. Who is right?
Both A & B
Technician A says a short circuit can be caused by a conductor touching ground. Technician B says a short circuit can be caused by a conductor touching another conductor. Who is right?
Both A & B
Technician A says a transformer can be used to isolate a circuit. Technician B says a transformer can be used to change the voltage in a circuit. Who is right?
Both A & B
Technician A says an insulator is a substance that resists the flow of electricity. Technician B says the atoms in an insulator are very stable and resist electron movement. Who is right?
Both A & B
Technician A says an open will always stop current in a circuit. Technician B says high circuit resistance will normally reduce current in a circuit. Who is right?
Both A & B
Technician A says intermittent problems occur only under certain conditions. Technician B says intermittent problems are often caused by poor electrical connections. Who is right?
Both A & B
Technician A says silver is a good electrical conductor. Technician B says iron is a good electrical conductor. Who is right?
Both A & B
Technician A says that as voltage increases and resistance remains constant, current increases. Technician B says that as voltage decreases and resistance remains constant, the number of free electrons flowing through a circuit decreases. Who is right?
Both A & B
Technician A says the HV battery ECM can activate a battery cooling system when the HV battery cells become hot. Technician B says that if the HV battery temperature sensor detects battery overheating, it can prompt the HV battery ECM to disconnect the HV power control module to prevent further overheating. Who is right?
Both A & B
Technician A says the frame-ground circuit, also called a one-wire circuit, uses the metal structure of the vehicle to return electricity to the power source. Technician B says the ground includes the portion of the circuit between the load and the negative terminal of the battery. Who is right?
Both A & B
Technician A says the voltage and current in a transformer are inversely proportional. Technician B says impedance is resistance to alternating current at a given frequency. Who is right?
Both A & B
Technician A says wire code identification systems provide information about the appearance, location, and size of wire in a given circuit. Technician B says wire code identification systems vary from manufacturer to manufacturer. Who is right?
Both A & B
The active material on positive plates is:
Lead Peroxide
An atomic force that can attract or repel ferrous substances is known as:
Magnetism
A particular diode has a reading of infinite ohms in both directions. Technician A says this indicates the diode is in good condition. Technician B says this indicates that the diode has an internal short. Who is right?
Neither A Nor B
Battery plates are grids that are coated with:
Porous Lead
Which of the following is not a common type of electric circuit?
Series-Ground Circuit
Which of the following uses a plunger to move a shift lever that engages the pinion gear?
Starter Actuated Solenoid
Direct ignitions systems are being discussed. Technician A says that service procedures for these systems are very similar to procedures used on contact point distributor ignition systems. Technician B says that when replacing this type of coil, the new coil requires a 1″ air gap with the spark plug. Who is right?
A Only
Ignition modules are being discussed. Technician A says that the module may be adversely affected by excessive heat and vibration. Technician B says that a specific car company's ignition modules will be identical across all the vehicle makes and models they manufacture. Who is right?
A Only
Technician A says a peak-and-hold injector waveform will have two induced voltage spikes. Technician B says a peak-and-hold fuel injector circuit uses a low amount of current to open the injector and a high amount of current to hold the injector open. Who is right?
A Only
Technician A says a thyristor is a controllable diode. Technician B says a thyristor can be used to control different amounts of current. Who is right?
A Only
Technician A says a transistor is a device used to amplify current in a circuit. Technician B says a transistor is a device used to rectify current in a circuit. Who is right?
A Only
Technician A says an AND gate requires voltage at both inputs to produce a voltage at the output. Technician B says an AND gate requires voltage at only one input to produce a voltage at the output. Who is right?
A Only
A radiator shop will properly:
All Of The Above
Technician A says a passive automotive sensor is capable of generating its own voltage. Technician B says a passive automotive sensor is not capable of generating its own voltage. Who is right?
B Only
Technician A says a reference voltage of about 12 volts is normally required for an automotive variable resistance type sensor to operate properly. Technician B says a reference voltage of about 5 volts is normally required for an automotive variable resistance type sensor to operate properly. Who is right?
B Only
Technician A says a switch diagnostic test involves energizing specific output devices. Technician B says an actuator diagnostic test involves the scan tool giving orders to the vehicle's computer. Who is right?
B Only
Technician A says about 50% of all automotive engine performance problems are caused by the computer system. Technician B says about 80% of all automotive engine performance problems are caused by something other than a computer system malfunction. Who is right?
B Only
Technician A says automotive computer system trouble codes are used to detect faulty components in the system. Technician B says automotive computer system trouble codes are used to indicate the general area of trouble in a computer system. Who is right?
B Only
Technician A says both inputs of a NAND gate must be on to produce an output. Technician B says both inputs of a NAND gate must be off to produce an output. Who is right?
B Only
Technician A says a scan tool can be used to check computer system actuator operations. Technician B says a scan tool can be used to check the operation of computer system sensors. Who is right?
Both A & B
Technician A says a servo motor is one type of output device used in an automotive computer system. Technician B says a solenoid is one type of output device used in an automotive computer system. Who is right?
Both A & B
Technician A says a starter rebuild generally involves replacing brushes, bushings, and other damaged parts. Technician B says the commutator is typically polished or turned during a starter rebuild. Who is right?
Both A & B
Which of the following are known as the "linking cells" of the human brain?
Neurons
Which of the following separates engine parts to prevent metal on metal contact?
Oil Film
Which of the following holds an extra supply of oil for a lubrication system?
Oil Pan
Each of the following is a function of diesel injection pumps, except:
Open Injector Nozzles Before Injection
All of the following can normally be performed during an automotive computer system actuator self-test except:
Operate The Reed Valve
Which device will properly measure ignition system operating voltages over time?
Oscilloscope
A diesel fuel substance that can separate from other fuel parts and clog fuel filters is:
Paraffin
Which of the following is not a solenoid injector part?
Piezo Crystal
The component that is turned by the alternator drive belt and creates a rotating magnetic field is the:
Rotor
The highest API oil service rating for gasoline engines is:
SN
A starter armature consists of each of these except:
Flange
Which of the following is used with a wireless diagnostic tablet?
Sending Unit
Which of the following tests measures the number of amps used by a starting system?
Starter Current Draw Test
10,000 ohms can also be written as:
10 kilohms
An electric fuel pump will usually produce:
10-50 PSI
High-pressure injectors used in DEFI systems often require up to how many volts dc for proper solenoid operation?
100 Volts
A fully charged 12-volt battery should have an open circuit voltage of:
12.4 Volts Or Higher
When recording no-load voltage, the voltmeter reading should increase from the base reading by no more than:
2-3 Volts
DEFI electronic fuel injection pressure can reach this level at high engine speeds:
2000 psi
Which of the following is a normal fuel pressure inside the fuel rail of today's DEFI systems?
2000 psi
A 12-volt circuit has a resistance of 2 ohms. How much current is in the circuit?
6 Amps
A car equipped with a coil pack ignition enters the shop with two dead cylinders. Technician A says to check to see if the dead cylinders are operated by the same ignition coil pack. Technician B says there is no need for this step as one coil pack fires all engine cylinders in this system design. Who is right?
A Only
A trouble code is triggered in an automotive computer system. Technician A says fuel-contaminated engine oil could possibly trigger this trouble code. Technician B says fuel-contaminated engine oil has no effect on computer system operation. Who is right?
A Only
A trouble code shows a problem with an active sensor. Technician A says the voltage produced by an active sensor is very low, often under 1 volt. This makes sensor output and wiring harness continuity very critical. Technician B says that active sensor signals are just as strong as passive sensor signals. Who is right?
A Only
An automobile's oxygen sensor output needs to be checked. Technician A uses a digital voltmeter to check this sensor's output. Technician B uses an analog ohmmeter to check this sensor's output. Who is right?
A Only
Direct electronic fuel injection systems are being discussed. Technician A says that these systems control the air-fuel mixture more precisely than indirect systems. Technician B says that these systems have been replaced by multiport systems in most late-model vehicles. Who is right?
A Only
Hybrid vehicle charging system problems are being discussed. Technician A says that an HV battery that will not hold a proper electrical charge will set a diagnostic trouble code. Technician B says that loose HV cable connections will not affect electric drive train performance. Who is correct?
A Only
Technician A says a push-button switch has a spring-loaded button that, when pressed, makes or breaks an electrical connection. Technician B says pressure switch is a special type of push-button switch that stays in one position until you move it. Who is right?
A Only
Technician A says a series circuit has only one path for current. Technician B says a series circuit can have only one load. Who is right?
A Only
Technician A says a spark plug misfire can affect the operation of an automotive computer system. Technician B says an automotive computer system is not affected by a spark plug misfire. Who is right?
A Only
Technician A says an IC is an electronic circuit that has been reduced in size and etched on the surface of a semiconductor chip. Technician B says an IC is a small power transistor, amplifier circuit for increasing output strength. Who is right?
A Only
Technician A says current is the same everywhere in a series circuit. Technician B says current is the same in each branch of a parallel circuit. Who is right?
A Only
Technician A says that no coil wire is needed with an ignition coil pack. Technician B says that an eight-cylinder engine equipped with a coil pack system uses two ignition coil packs. Who is right?
A Only
Technician A says the term "left side of the vehicle" is sometimes abbreviated in an automotive wiring diagram as LH. Technician B says the term "left side of the vehicle" refers to the passenger side of the vehicle. Who is right?
A Only
Technician A says to use live readings from a scan tool or laptop computer to read HV battery voltage, current output while driving, battery temperature, and other readings to evaluate battery condition. Technician B says to use a conventional 12-volt battery load tester by connecting it to the HV power cables. Who is right?
A Only
The boost on a supercharger is measured and it is found that the supercharger is producing no boost. Technician A says that the ECM may not be sending a signal to engage the electromagnetic clutch. Technician B says that the supercharger bypass valve may be stuck closed. Who is correct?
A Only
The electromagnetic clutch on a supercharger is not engaging. Technician A says to check for the proper signal from the ECM. Technician B says that the clutch coil should have high resistance in its windings. Who is correct?
A Only
The malfunction indicator light in an OBD II system is flashing. Technician A says this means the problem could be damaging the catalytic converter. Technician B says that this simply indicates a soft problem. Who is right?
A Only
To check a HV charging system, Technician A says to use on-board diagnostics and a scan tool, laptop, or diagnostic tablet. Technician B says to check data stream values to gain more information on the performance of the HV charging system. Who is correct?
A Only
Each of the following can be used to start spark plugs in their holes except:
A Ratchet
12-volt battery maintenance and inspection should be conducted:
All Of The Above
A bad water pump may:
All Of The Above
Charging system tests are performed using a(n):
All Of The Above
Crude oil is a mixture of:
All Of The Above
Fuel filters are located:
All Of The Above
If a DEFI multiport injector is removed for service, manufacturers suggest replacing the:
All Of The Above
In an engine with a dead cylinder, the problem could be a bad:
All Of The Above
Which of the following are used to stop contaminants from entering parts that could be damaged by foreign matter?
All Of The Above
Which of the following is another name for an automotive computer?
All Of The Above
Which of the following may be used to prevent coolant leakage between the water pump housing and engine?
All Of The Above
Which of the following shows the general charge condition of a 12-volt battery?
All Of The Above
A wiggle test is being performed on an automotive computer system. Technician A performs this test with the engine off and the ignition key off. Technician B performs this test with the engine off and the ignition key on. Who is right?
B Only
An ignition switch is being tested with a test light. When connected to the solenoid start terminal, the light glows when the key is in the start position and the run position. Technician A says the switch is working properly. Technician B says the ignition switch is most likely shorted. Who is right?
B Only
Supercharger cooling systems are being discussed. Technician A says that hot air carries more oxygen for combustion than an equal amount of cooler air. Technician B says that such a system often uses its own electric pump, hoses, and radiator to pump cool antifreeze through the supercharger intercooler . Who is right?
B Only
Technician A says a diesel engine has a natural source of vacuum in the intake manifold. Technician B says a vacuum pump is frequently used on a diesel engine to provide a vacuum source for the power brakes, A/C ventilation system, and emission control devices. Who is right?
B Only
Technician A says a fuel injector impedance test is typically performed on piezo injectors. Technician B says a fuel injector impedance test can help pinpoint intermittent problems. Who is right?
B Only
Technician A says a multiple discharge ignition system fires the spark plug during each of the engine's four-cycle strokes. Technician B says that a dual spark plug ignition system ensures better ignition and combustion of the air-fuel mixture than a single spark plug per cylinder system. Who is right?
B Only
Technician A says digital electronics deals with the way an alternator charges a battery. Technician B says digital electronics deals with the way a computer system uses discrete on and off signals to produce artificial intelligence. Who is right?
B Only
Technician A says in computer language a 0 or 1 is called a byte. Technician B says in computer language a 0 or 1 is called a bit. Who is right?
B Only
Technician A says that boost refers to any pressure above atmospheric pressure in an engine's combustion chambers. Technician B says that boost refers to any pressure above atmospheric pressure in an engine's intake manifold. Who is correct?
B Only
Technician A says that volumetric efficiency is a measure of how much air an engine can draw in on its power strokes. Technician B says that a normally aspirated engine is limited by its volumetric efficiency. Who is correct?
B Only
Technician A says that with a supercharged engine, there is a slight delay in pressure and power increase because the unit must build up speed. Technician B says that a supercharger is driven by a belt connected to the crankshaft pulley. Who is correct?
B Only
Technician A says the numbers 1 and 2 are used in the binary numbering system. Technician B says the numbers 0 and 1 are used in the binary numbering system. Who is right?
B Only
Technician A says the term "hard failure" refers to an intermittent automotive computer problem. Technician B says the term "hard failure" refers to a constant automotive computer problem. Who is right?
B Only
While discussing electronic gasoline injection systems, Technician A states that multiport EFI systems are classified as direct injection systems. Technician B says that multiport EFI systems use one injector per engine cylinder. Who is right?
B Only
After performing a starting headlight test, Technician A says the resulting bright lights and no-crank condition indicate starting circuit high resistance. Technician B says the test results suggest an open starting circuit. Who is right?
Both A & B
After testing a fuel pressure regulator and finding pressure low, Technician A suggests checking the fuel pump before actually replacing the regulator. Technician B proposes checking the fuel filters before replacing the regulator. Who is right?
Both A & B
An oxygen sensor tested faulty and must be replaced. Technician A says to use a sealant that is safe for oxygen sensors on the threads. Technician B says to use a sensor socket to prevent sensor damage. Who is right?
Both A & B
Inline diesel injection pumps are being discussed. Technician A says these pumps can be used with either hydraulic injectors or electro-hydraulic injectors. Technician B says these pumps have one plunger for each engine cylinder. Who is right?
Both A & B
Technician A says a 50/50 mix of antifreeze and water is commonly used to provide protection for most weather conditions. Technician B says that minimum coolant strength should be several degrees lower than the lowest normal temperature for the climate of the area. Who is right?
Both A & B
Technician A says a bad starter relay will keep power from the starter solenoid. Technician B says a faulty neutral safety switch can prevent current from flowing from the ignition switch to the starter solenoid. Who is right?
Both A & B
Technician A says a basic circuit problem is caused by something in the circuit that increases or decreases current. Technician B says a basic circuit problem is caused by something in the circuit that increases or decreases resistance. Who is right?
Both A & B
Technician A says a faulty actuator can affect the operation of an automotive computer system. Technician B says a leaking vacuum hose can affect the operation of an automotive computer system. Who is right?
Both A & B
Technician A says a load is a basic component of an electric circuit. Technician B says a power supply is a basic component of an electric circuit. Who is right?
Both A & B
Technician A says an automotive computer can be located under the dash. Technician B says an automotive computer can be located in the automobile's engine compartment. Who is right?
Both A & B
Technician A says an inductive wire tracer generates pulses of ac in the wiring being tested. Technician B says an inductive wire tracer checks for continuity in the wiring. Who is right?
Both A & B
Technician A says high-power electric powertrains supplement HV battery air cooling with liquid cooling. Technician B says that a coolant heat storage system is required on gasoline engine hybrids equipped with port fuel injection. Who is right?
Both A & B
Technician A says that with modern ignition coils, open-circuit voltage can reach 100,000 volts. Technician B says that average operating voltages for an ignition system are about 15,000 volts. Who is right?
Both A & B
Technician A says wire resistance depends on the type of material used for the conductor. Technician B says wire resistance depends on the temperature of the conductor. Who is right?
Both A & B
Technician A says wire resistance increases as conductor diameter decreases. Technician B says wire resistance increases as conductor length increases. Who is right?
Both A & B
The advantages of computers in late-model vehicles are being discussed. Technician A says computers can compensate for mechanical wear. Technician B says computer systems have onboard diagnostic systems that can detect and record system problems. Who is right?
Both A & B
There is an open in an automobile's headlight circuit. Technician A says this problem can be caused by a blown fuse. Technician B says the problem may be caused by burned switch contacts. Who is right?
Both A & B
When looking at cetane ratings, Technician A says that the higher a cetane number is, the easier an engine starts and runs in cold weather. Technician B says that the higher a cetane number is, the easier a fuel ignites from heat and pressure. Who is right?
Both A & B
While conducting a secondary wire resistance test, Technician A states that wire resistance should be approximately 12,000 ohms per foot. Technician B says that a direct ignition coil boot can deteriorate over time. Who is right?
Both A & B
While discussing hybrid starting systems, Technician A says the hybrid control module activates the fuel and ignition systems so the engine will start and run. Technician B says the HV power control module converts dc into three-phase ac to operate the motor-generator for engine startup. Who is right?
Both A & B
Which of the following is not an indication of a bad starter solenoid?
Cranking Without Starting
Gasoline injection systems feed fuel into an engine using:
Pressure
Ignition system wires that operate at battery voltage are considered part of the:
Primary Circuit
Typical oxygen sensor output should be about:
0.5 Volts
Which of the following will neutralize and remove an acid-dirt mixture from a 12-volt battery case?
Baking Soda And Water
To reduce alternator output, the voltage regulator places more resistance between the:
Battery And The Field Windings
Each of the following provides a means of connecting battery plates to a car's electrical system except:
Battery Caps
Each of the following can be performed using a voltmeter except:
Battery Plate Test
Which of the following is the ignition switch locking mechanism?
Tumbler
Which of the following are placed inside fuel tanks to prevent fuel splashing?
Baffles
The sensor used to detect engine speed is the:
Crankshaft Position Sensor
Which of the following is not a battery cell component?
Eye
Which of the following components steps down and rectifies the high-voltage ac used in hybrid charging systems?
HV Power Control Module
An ignition system uses this to change battery voltage into high secondary voltage:
Ignition Coil
During a 12-volt charging system voltmeter test, all electrical accessories are on when checking:
Load Voltage
An injector balance test is being performed on an OBD II vehicle. Technician A says that during this test, each injector is shut off individually and the difference in the corresponding cylinder's power contribution is recorded. Technician B says an engine mechanical problem can cause a cylinder to fail a balance test. Who is right?
Neither A Nor B
Technician A says a fuel injector pulsed flow test measures steady or maximum fuel flow with the injector pintle and nozzle held fully open. Technician B says an injector maximum flow test fires an injector several times with a normal pulse width to check pintle response. Who is right?
Neither A Nor B
Technician A says electricity is the movement of free atoms from one place to another. Technician B says electricity is the movement of free elements from one place to another. Who is right?
Neither A Nor B
Technician A says late-model vehicles keep ignition timing the same under varying conditions and engine speeds. Technician B says that most late-model vehicles require non-resistor spark plugs. Who is right?
Neither A Nor B
Technician A says that a normally aspirated engine is equipped with a supercharger. Technician B says that a normally aspirated engine is equipped with a turbocharger. Who is correct?
Neither A Nor B
Technician A says the electron flow theory states that electrons flow through a circuit from positive to negative. Technician B says the conventional current theory states that electrons flow through a circuit from negative to positive. Who is right?
Neither A Nor B
The current in an automotive taillight circuit needs to be checked. Technician A connects a conventional ammeter in parallel with the circuit being tested. Technician B connects a conventional voltmeter in series with the circuit being tested. Who is right?
Neither A Nor B
All of the following are common types of transistors except:
Zener Transistor
Technician A says a diode is commonly used to convert alternating current into direct current. Technician B says one diode in series with an ac source produces full-wave rectification. Who is right?
A Only
Technician A says stranded wire is normally used to connect an automobile's electronic components. Technician B says solid wire is generally more flexible than stranded wire. Who is right?
A Only
Technician A says that a diode only allows current flow in one direction? Technician B says a diode simply regulates current flow in both directions.
A Only
Technician A says that before using a tire pressure monitor calibration tool, tire pressure should be set to specifications. Technician B says the tire pressure monitor calibration tool must be plugged into the vehicle's computer. Who is right?
A Only
An HV battery stores chemical-electrical energy that is used to _____.
All Of The Above
Technician A says a 20-amp automotive fuse will handle 25 amps of current without blowing. Technician B says that a replacement fuse must have the same amp rating as the original. Who is right?
B Only
A vehicle's fuel injection control unit is difficult to locate. Technician A checks a wiring diagram in the service information to help locate this component. Technician B checks a component location table in the service information to locate the vehicle's fuel injection control unit. Who is right?
Both A & B
Technician A says a basic circuit problem can be caused by something in the circuit that increases voltage. Technician B says a basic circuit problem can be caused by something in the circuit that decreases resistance. Who is right?
Both A & B
Which device locks a pinion gear in one direction and releases it in the other?
Overrunning Clutch
Which of the following should not be done when servicing an HV battery?
Pour Water On Smoldering Lithium-Ion Electrolyte
An electrical device that uses a small input current to control a larger current is known as a(n):
Relay
Charging time for this device with a 12-volt battery is about 12 hours.
Slow Charger
A crimp connector must be replaced. Technician A twists the wire strands before inserting the wire into the connector. Technician B fastens the new connector to the wire by squeezing the connector's plastic cover. Who is right?
A Only
More than one component in a particular automotive electric circuit is not working. Technician A starts testing the circuit at the power source. Technician B starts testing the circuit at its load. Who is right?
A Only
Technician A feels the best test to determine 12-volt battery current output and performance is the battery load test. Technician B feels hydrometer testing is the best choice. Who is right?
A Only
Technician A says the small base circuit of a transistor controls current flow. Technician B says the small emitter circuit controls current flow. Who is right?
A Only
When reviewing starter motor classifications, Technician A says starters are grouped by type of pinion gear engagement. Technician B says starters are grouped by type of armature. Who is right?
A Only