auto 180-420
Why do professional repair shops not use drive-on-type ramps?
Drive-on-type ramps are dangerous to use.
An engine equipped with GDI could use the system to start the engine. When is this feature most useful?
During idle stop
During which period does the combustion speed to increase by up to 10 times, thus causing increase in temperatures and pressures, which can damage pistons, gaskets, and cylinder heads.
During spark knock (detonation)
____________ has better cold-flow properties than conventional diesel.
E-diesel
Which one of these sensors is used to determine injector pulse width during open-loop mode?
ECT sensor
Which of the following statements is true about the companion or paired cylinders used in waste-spark ignition systems?
Each end of the secondary winding is connected to a cylinder exactly opposite the other in the firing order.
What type is the throttle position sensor used in the throttle body assembly of an ETC system?
Either a potentiometer or a Hall-effect sensor
Which type of port fuel-injection system uses a fuel temperature and/or fuel-pressure sensor?
Electronic returnless systems
Which of the following components help identify a flex-fuel vehicle?
Emblems on the side, front, and/or rear of the vehicle, yellow fuel cap showing E85/gasoline, vehicle emission control information (VECI), vehicle identification number (VIN)
What factor does an engineer use to calculate engine airflow requirements?
Engine displacement
Which of the following laws or agencies publishes a list of hazardous materials that is included in the Code of Federal Regulations (CFR).
Environmental Protection Agency
E-diesel is diesel fuel with what additive?
Ethanol
Which diesel injection system supplies high-pressure diesel fuel to all of the injectors all of the time?
High-pressure common rail
To determine if a product or substance being used is hazardous, consult ______________.
SDS
Port fuel-injection systems generally use what type of injector driver?
Saturated switch
Which of the following is a specialty tool?
Seal drivers
Which among the following is an advantage of the electronic throttle control (ETC) system?
Smooth engine operation, especially during rapid acceleration.
Why is the catalytic converter placed as close to the engine as possible?
So that the heat can help the converter work most efficiently
Which of the following can be used to avoid damage on a material during pounding?
Softer tool than the material to be pounded
Which of the following is true about mercury?
Some vehicles have a placard that lists the components that contain mercury.
Which of the following takes place during regeneration in a diesel particulate filter (DPF)?
Soot is being burned.
What part of the scope pattern shows the duration of the spark?
Spark line
Which of the following itself becomes a sensor in an ion-sensing ignition system?
Spark plug
Which of the following is not one of the four wires used in the circuit of a bypass ignition?
Spark plug wires
What should be inspected as part of a visual inspection of the ignition system?
Spark plug wires for proper routing
The primary (low-voltage) ignition system must be working correctly before any spark occurs from a coil. Which component is not in the primary ignition circuit?
Spark plug wiring
Which fuel-injection system uses the MAP sensor as the primary sensor to determine the base pulse width?
Speed density
All throttle-body fuel-injection systems use what method of fuel calculation?
Speed-density method
What type of device is used in a typical idle air control?
Stepper motor
Why can a stepper motor not be used by an ETC system?
Stepper motor is too slow to react.
Which mode of operation results in a richer combustion near the spark plug?
Stratified
________ position is used to look at differences in patterns between cylinders in all areas except the firing line.
Superimposed
Which among the following materials is used for the construction of fuel lines?
Synthetic rubber
Which sensor has the greatest influence on injector pulse width besides the MAF sensor?
TP
Selective catalytic reduction (SCR) uses urea injection to reduce _______emissions.
NOx
A Hall-effect TP sensor is less likely to fail due to wear. This is true because.
The sensors do not come into physical contact.
With the ignition off and the key out of the ignition, what should happen if a technician uses a screwdriver and gently pushes on the throttle plate in an attempt to open the valve?
The throttle should move and then spring back to the home position when released.
The device used by service technicians to maneuver easily when underneath the vehicle is called _________.
creeper
The differential pressure sensor (DPF) measures pressure difference across the _______.
diesel exhaust particulate filter (DPF)
Commonly damaged areas of a vehicle during hoisting include all of the following, except _________________.
differential units
Coil polarity is determined by the ________________.
direction of rotation of the coil windings
HEI and EIS are examples of ___________________.
distributor ignition system
When loosening a bolt, a(n) ________ is the recommended tool.
six-point socket
Wetted asbestos dust is considered to be ______________.
solid waste
The process of combustion occurring without an open flame is called ______________.
spontaneous combustions
A rotating force is called ________.
torque
____________ help prevent power loss and stalling in cold weather.
Diesel fuel heaters
Which of the following is NOT a diesel fuel additive?
Diesohol
Which of the following statements is true?
Direct injection diesel engines are more fuel efficient than indirect injection diesel engines but generate more noise.
Where is the fuel injected in an engine equipped with gasoline direct injection?
Directly into the combustion chamber
________ position is used to look at the firing lines.
Display
Used engine oil should be disposed of by all except which of the following methods?
Disposed of in regular trash
Which of the following components is not used in an electronic ignition system?
Distributor
Which of the following is a component of a secondary ignition circuit?
Distributor cap
What is another name for waste-spark ignition system?
Distributorless ignition system
Nitrous oxide injection adds ________, allowing the engine to burn more fuel.
Oxygen
Which of the following statements is TRUE as an advantage of oxygenated fuels?
Oxygenated fuels are commonly used in high-altitude areas to reduce carbon monoxide (CO) emissions.
When using a fire extinguisher, what word can be used to remember what to do?
PASS
Boost pressure is generally measured in ______.
PSI
Throttle-body fuel-injection systems use what type of injector driver?
Peak and hold
Which among the following is another commonly used name for a hydrokinetic pump?
Peripheral pump
The ignition module has direct control over the firing of the coil(s) of an electronic ignition system. Which component controls the module?
Pickup coil
Which among the following is a material used for the construction of fuel tanks?
Polyethylene plastic
Which system has a injector for each cylinder?
Port fuel-injection system
Which of the following sums up the procedure of checking for the presence of alcohol in gasoline?
Pour the suspect gasoline into a graduated cylinder and add water to check if the alcohol absorbs the water.
What component pulses the fuel injector on most vehicles?
Powertrain control module (PCM)
Which of the following is a reason to remove metal jewelry when working around a battery?
Presence of jewelry can create a possibility of electric shock to the worker.
___________ is the method that tests for mechanical defects that affect fuel flow amounts.
Pressure-drop balance test
Which is the most widely used alternative fuel?
Propane
________ position is used to look at spark line length and transistor-on point.
Raster
What color is diesel fuel dyed if it is for off-road use only?
Red
Using ethanol-enhanced or reformulated gasoline can result in _________.
Reduced fuel economy compared to using 100% gasoline.
What service operation is most important on engines equipped with a turbocharger?
Regular oil changes
__________________ is the pressure of the vapor above the fuel when the fuel is at 100°F (38°C).
Reid vapor pressure
A customer brings a vehicle with GDI and complains that the engine starts and idles, but lacks the power to accelerate. Upon inspection, you find that the GDI injector is covered in carbon. After a conventional carbon cleaning procedure, you are about to replace the injector. What is important to do during this step?
Replace the Teflon seal.
Pressure is too high after engine start-up. Which among the following is a possible cause?
Restricted fuel return line
Biodiesel is vegetable oil after the ___________ is removed.
glycerin
Using a(n) _________ with a pressure transducer allows the technician to view the fuel pressure over time.
graphing multimeter (GMM)
An exhaust system has ________ and _________ to isolate exhaust system vibrations from the vehicle body and to control the movement as the exhaust system changes in length due to heat.
heat shields and hangers
Vegetable oil needs to be ________ to obtain a similar viscosity to biodiesel and petroleum diesel.
heated
The gasoline burned inside the internal combustion engine is a type of___________.
hydrocarbon
The API viscosity of a diesel fuel is measured using a(n) ___________.
hydrometer
The spark line is a short horizontal line ________.
immediately after the firing line
While increasing the boost pressure, if the temperature of air increases, combustion temperature _________.
increases
A single overhead camshaft (SOHC) design operates the valves _________ while a double overhead camshaft (DOHC) design operates the valves _______.
indirectly, directly
Because of ________________, an ignition coil cannot be fully charged (reach magnetic saturation) until after a delay of about 10 milliseconds.
inductive reactance
In a gasoline direct-injection system, the location of the ________ varies, depending on the design.
injector
The location of the variable fuel sensor is always in the fuel line between the fuel tank and the fuel _____________.
injectors
Seal drivers are used to________.
seat the outer lip of a grease seal into the grease seal pocket
The passage in the engine block and crankshaft through which lubricating oil flows is called the _____________.
oil gallery
Which of the following products are created in the methanol-to-gasoline (MTG) process?
olefins and paraffins (alkenes), and aromatic compounds
The formula (π × R2 × Stroke × Number of Cylinders) provides the displacement or volume of the engine where R is the radius of the cylinder. R is _______ the value of the bore.
one-half
The first criterion for identifying used oil is based on the oil's ___________?
origin
The regular diesel fuel is also known as ___________.
petrodiesel
The upper portion of a two-part intake manifold is often called the ______________.
plenum
A ________ is used to remove and install engines and other heavy vehicle components.
portable crane
The roots-type supercharger is also called a _______.
positive displacement design
Torque is expressed in units of ________.
pound-feet
Air filters can remove particles and dirt as small as ______________.
10 to 25 microns
What is the purpose of the World Wide Fuel Charter?
Develop a quality standard for the kind of gasoline fit to be used
Three-wire potentiometer sensors produce an analog (variable) voltage signal that is proportional to the throttle plate position. The two sensors produce opposite signals as the throttle plate opens. They operate in voltages of ______.
0.5 and 4.5 volts
A good fuel pump should be able to supply how much fuel per minute?
0.5 to 0.8 gallons
The temperature of an exhaust manifold can exceed ________.
1,500°F
Which air impact drive size is the most commonly used?
1/2 inch
The engine compression ratio of a gasoline direct-injection system is ______.
11.1-13.1
When washing hands, the water should be at what temperature?
110°F (43°C)
An oil filter should be hot drained for how long before disposing of the filter?
12 hours
In GDI systems, during the high-voltage boost phase, the capacitor is discharged through an injector, allowing for initial injector opening. The injector is then held open with how many volts?
12 volts
What is the amount of voltage applied to the injector in a saturated switch-type injector-driven circuit?
12 volts
How much compressed natural gas (CNG) is required to achieve the energy of one gallon of gasoline?
122 cubic feet
Ultra-low-sulfur diesel fuel has how much sulfur content?
15 PPM
Winter-blend gasoline allows volatility of up to _________ RVP
15 pounds per square inch (PSI)
To what extent is the throttle plate spring loaded to hold the throttle slightly open?
16% to 20%
What range of compression ratios is generally used by diesel engines?
17:1 to 25:1
In a four-stroke cycle, the crankshaft rotates through _______ degrees while the camshaft rotates through ______ degrees for each stroke.
180, 90
Most fuel filters are designed to remove particles larger than __________.
20 microns
At what distance is a fuel injector located in the intake manifold from the intake valve?
3 to 4 inches
A normally aspirated automobile engine loses about _______ power per 1,000 feet of altitude.
3%
The compressed air from an air nozzle should be reduced to less than ________.
30 PSI
When using compressed air and a blow gun, what is the maximum allowable air pressure?
30 PSI
When a gerotor-type fuel pump is used, the filter sock is designed to filter out particles larger than ________.
30 microns
To allow time for the amount of fuel needed to catch up to the opening of the throttle plate, opening of the throttle plate can be delayed as long as _______.
30 milliseconds
Most port fuel-injected engines operate on how much fuel pressure?
35 to 45 psi (240 to 310 kPa)
In a gasoline direct-injection system, what is the injection pulse width at idle in microseconds?
400 microseconds
The cetane rating of diesel fuel should be between __________.
45 and 50
Batteries should not be tipped to more than a(n) ______________ angle.
45-degree
When mounting an engine to an engine stand, what grade of bolt should be used?
5 or 8
To detect abnormal combustion, the knock sensor is tuned to the engine knock frequency. What is the range of this frequency?
5 to 10 kHz
When an EGR valve is opened, what is the percentage of the exhaust gas that it allows to enter the intake manifold?
5 to 10 percent
What is the minimum size of nozzle that is used in a nitrous oxide system installation and calibration?
50 hp
The fuel injectors used on a gasoline direct-injection system are pulsed using what voltage?
50 to 90
The fuel injectors operate under a fuel pressure of about ________.
500 to 2,900 psi
Typical secondary coil resistance specifications usually range from __________ ohms.
6,000 to 30,000
The first fuel filter in the sock inside the fuel tank normally filters particles larger than _________.
70 to 100 microns
One cylinder of an automotive four-stroke cycle engine completes a cycle every ________.
720°
What is the value of applied pressure maintained while flushing the fuel rail and upper fuel-injector screens including the fuel pressure regulator?
75 to 90 PSI
B20 biodiesel has how much regular diesel fuel?
80%
E85 means that the fuel is made from _____________.
85% ethanol, 15% gasoline
Hearing protection should be worn anytime the noise level exceeds __________.
90 dB
A green wrench symbol is displayed on the dash. What does this mean?
A fault in the ETC in a Ford has been detected.
What will happen if an injector is tested using a pulse-type tester more than one time without starting the engine?
A hydrostatic lock will occur.
Gasoline should be stored in approved containers that include what color(s)?
A red container
In vehicles equipped with ETC, a slight clicking sound may be heard under the hood when turning on the ignition. Why is this?
A test performed by PCM to detect malfunction
Which of the following is true about air compressors?
A typical shop compressor is usually placed out of the way.
All safety glasses should meet the standards set by ________.
ANSI
The specific gravity of diesel fuel is measured in what units?
API gravity
When checking for proper pad placement, how high should the vehicle be raised?
About 1 foot (30 cm)
Which of the following are considered as biomass?
Agricultural residue and wood waste.
____ are commonly used in auto body work when many holes need to be penetrated for plug welding.
Air drills
Which of the following allows flow of air through several fiber surfaces that trap microbes, dust, dirt, and carbon?
Air filter element
Which of the following is true with respect to fuel injectors?
All fuel injectors should make the same sound with the engine running at idle speed.
Why is all gasoline said to be fungible?
All gasoline is capable of being interchanged because each grade is created to specification.
Which of the following metals are used for exhaust pipes to resist rust and corrosion?
Aluminized or stainless steel
Which of the following statements is true about adjustable wrenches?
An adjustable wrench should not be used to loosen or tighten fasteners.
What does a normally aspirated engine use for its intake charge?
Atmospheric pressure
Most manufacturers of vehicles equipped with diesel engines allow what type of biodiesel?
B5
_______________ vehicles have only one fuel tank.
Biodiesel-powered
What type of socket should be used with an air impact wrench?
Black
Fuel injection service is being discussed. Technician A says that the throttle plate(s) should be cleaned. Technician B says that the fuel rail should be cleaned. Which technician is correct?
Both Technicians A and B
Technician A says that a cracked exhaust manifold can affect engine operation. Technician B says that a leaking lower intake manifold gasket could cause a vacuum leak. Which technician is correct?
Both Technicians A and B
Technician A says that a defective spark plug wire or boot can cause an engine misfire. Technician B says that a tracked ignition coil can cause an engine misfire. Which technician is correct?
Both Technicians A and B
Technician A says that a stuck-open wastegate can cause the engine to burn oil. Technician B says that a clogged PCV system can cause the engine to burn oil. Which technician is correct?
Both Technicians A and B
Technician A says that impact sockets have thicker walls than conventional sockets. Technician B says that impact sockets have a black oxide finish. Which technician is correct?
Both Technicians A and B
Technician A says that some intake manifolds are plastic. Technician B says that some intake manifolds are constructed in two parts or sections: upper and lower. Which technician is correct?
Both Technicians A and B
Technician A says that the fuel pump relay is usually controlled by the PCM. Technician B says that a TBI injector squirts fuel above the throttle plate. Which technician is correct?
Both Technicians A and B
Technician A says that the research octane number is higher than the motor octane number. Technician B says that the octane rating posted on fuel pumps is an average of the two ratings. Which technician is correct?
Both Technicians A and B
The fuel pressure drops rapidly when the engine is turned off. Technician A says that one or more injectors could be leaking. Technician B says that a defective check valve in the fuel pump could be the cause. Which technician is correct?
Both Technicians A and B
Two technicians are discussing a no-start (no-spark) condition. Technician A says that an open CKP sensor could be the cause. Technician B says that a defective ignition control module (ICM) could be the cause. Which technician is correct?
Both Technicians A and B
Technician A says that in going to high altitudes, engines produce lower power. Technician B says that most engine control systems can compensate the air-fuel mixture for changes in altitude. Which technician is correct?
Both technicians A and B
__________ of a vehicle body are the best places to position the pads on a vehicle without a frame.
Boxed areas
Which among the following is not a personal protective equipment (PPE)?
Bulletproof jacket
What do you call the service technician's protective head cover?
Bump cap
How are most superchargers lubricated?
By an internal oil reservoir
How does an idle air control (IAC) control the idle speed?
By controlling the amount of air that passes around the throttle plate
How are most turbochargers lubricated?
By engine oil under pressure through lines from the engine
Which valve is used on a factory supercharger to limit boost?
Bypass valve
______________ can be produced from a wide variety of cellulose biomass feedstock.
Cellulose ethanol
What rating of diesel fuel indicates how well a diesel engine will start?
Cetane rating
A customer brings a vehicle with GDI and complains that the vehicle is too noisy. Since GDI systems operate at a high pressure, they are noisier. But which among the following checks can be performed to see if the noise is more than what's normal?
Check fuel rail
Which of the following tools would not be useful to a technician performing electrical repairs?
Chip distractor
Which class of fire extinguisher is effective only on combustible metals, such as powdered aluminum, sodium, or magnesium?
Class D
Which act or organization regulates air-conditioning refrigerant?
Clean Air Act (CAA)
What is the only service an ETC system needs?
Cleaning the throttle body
What happens when oil in the center housing of a turbocharger is subjected to extreme heat?
Coke
Which of the following is a straight, sharp cutting end that is used for cutting off rivets or to separate two pieces of an assembly?
Cold chisels
Which of these methods is the proper way to dispose of used brake fluid?
Collect the fluid in a clearly marked container.
Which of the following basic hand tools should every technician possess?
Combination wrenches
Which of the following ignition systems or circuits does not require the use of a camshaft position sensor to determine specific cylinder numbers when used in an engine?
Compression-sensing ignition
________ is a type of relief valve that routes the pressurized air to the inlet side of the turbocharger.
Compressor bypass valve
What can be used to cover the jaws of a vise to help protect the object being held?
Copper jaw cover
The amperage draw of an electric fuel pump is higher than specified. Which among the following is a possible cause?
Corroded electrical connections at the pump motor
The amperage draw of an electric fuel pump is lower than specified. What is the most likely cause?
Corroded electrical connections at the pump motor
________________ is the process where hydrocarbons with higher boiling points could be turned into lower boiling hydrocarbons by treating them at very high temperatures.
Cracking
A Hall-effect switch also uses a stationary sensor and rotating trigger wheel. Which type of sensor is it?
Crankshaft position sensor
The throttle plate actuator motor is what type of electric motor?
DC motor
Which among the following is a required part for the ETC system.
DC motor
The correct formula for DI is:
DI = 1.5 × T10 + 3 × T50 + T90
What type of hammer is plastic coated, has a metal casing inside, and is filled with small lead balls?
Dead-blow hammer
Airbag safety should include which of the following precautions?
Exposing an airbag to extreme heat or fire is hazardous.
Pressure is too low after engine start-up. Which among the following is a possible cause?
Faulty in-tank fuel pump
Pressure drops off with key on and engine off. With key off, the pressure does not hold. Which among the following is a possible cause?
Faulty installation
Which item is usually not included in a first aid kit?
Fire blanket
A _____________ processing plant is able to produce a variety of fuels from coal.
Fischer-Tropsch
Which of the following is true about line wrenches?
Fitting wrenches are designed to grip almost all the way around a nut.
Which of the following formulas is used to calculate injector sizing when changing the mechanical characteristics of an engine?
Flow rate = hp × BSFC/number of cylinders × maximum duty cycle
Which type of trouble light is recommended for use in the shop?
Fluorescent
When cleaning a throttle body controller, it is important to make sure that the ignition key is out of the vehicle and the ready light is off. Why is this?
For personal safety
Which of the following is true about asbestos hazards?
Friction materials often contain asbestos.
Diesel fuel created using the Fischer-Tropsch diesel (FTD) process is called ___________.
GTL diesel
What part should be removed to test cylinder compression on a diesel engine?
Glow plug or injector
Most diesel fuel is what grade?
Grade #2
What can be used to measure the alcohol content in gasoline?
Graduated cylinder, Electronic Tester
Ethanol can be produced from what products?
Grains
Using a higher compression ratio (CR) results in which of the following?
Great power
Which of the following is used to ignite diesel fuel in a warm diesel engine?
Heat of compression
A(n) _______ is used on the intake duct between the air filter and the throttle body to reduce air intake noise during engine acceleration.
Helmholtz resonator
Which of the following is a disadvantage of the gasoline direct injection?
Higher cost
Why are creepers stored in a vertical position?
Horizontal storage of creepers creates the risk of fall.
Which of the following is true of a hydraulic jack?
Hydraulic fluid leakage makes a hydraulic jack unsuitable to hold a vehicle in position.
Which of the following is true about hydraulic press?
Hydraulic presses are mounted to a stand.
Which of the following is an advantage of the gasoline direct injection?
Improved fuel economy
Which method of blending ethanol with gasoline is the most accurate?
In-line
Which of the following occurs when the density of air-fuel charge is increased?
Increase in power
To avoid problems with the variation of gasoline, all government testing uses as a fuel during testing procedures.
Indolene
When current starts to flow into a coil, an opposing current is created in the windings of the coil. What is this opposing current generation called?
Inductive reactance
If it is tripped, which type of safety device will keep the electric fuel pump from operating?
Inertia switch
Which among the following is one of the preventive measures for rollover leakage protection?
Inertia switch
Which of the following features can be adjusted by the computer if the engine is equipped with a distributor?
Initial timing
How is injector pulse width in milliseconds (ms) calculated in speed density systems?
Injector pulse width = (MAP/BARO) × (RPM/Maximum RPM)
Where is the fuel pump located on most vehicles today?
Inside the fuel tank
The accelerator pedal position sensor uses two or three separate sensors that output a varying voltage signal. What is the purpose of using more than one sensor?
It allows the PCM to detect a malfunction.
Which of the following statement is true of dry chemical (yellow) fire extinguishers?
It eliminates the oxygen from the fire by coating the flammable materials.
Which type of pliers is capable of fitting over a large object?
Multigroove adjustable pliers
What is diesel exhaust fluid (DEF)?
It is one of the names for urea in North America.
The SAE standard for hoist location is _____________.
JRP- 2184
According to the Battery Council International (BCI), which of the following is true?
Lead-acid battery disposal is prohibited in incinerators.
What determines the amount of fuel injected when an injector opens?
Length of time the injector is open
Which of the following best describes light-emitting diode (LED) lights?
Light-emitting diodes (LED) are excellent to use because they are shock resistant.
What tool should be used to loosen or tighten brake or fuel lines?
Line wrench
What personal protective equipment should be worn when working with alternative fuels?
Long-sleeved shirt, long pants, safety glasses, and gloves
Which of the following is one of the symptoms that some drivers notice if the variable intake manifold system is not working?
Lower engine performance and fuel economy
Which of the following is one of the steps to set up and light a torch?
Make sure the oxygen tank valve is fully open.
Which alcohol is dangerous (toxic)?
Methanol
Technician A says that glow plugs are used to help start a diesel engine and are shut off as soon as the engine starts. Technician B says that the glow plugs are turned off as soon as a flame is detected in the combustion chamber. Which technician is correct?
Neither Technician A nor B
Technician A says that oil fouling is not caused by worn or broken piston rings. Technician B says oil fouling is not caused by defective or missing valve stem seals. Which technician is correct?
Neither Technician A nor B
The vacuum hose from the fuel-pressure regulator was removed from the regulator and gasoline dripped out of the hose. Technician A says that is normal and that everything is okay. Technician B says that one or more of the injectors may be defective, causing the fuel to get into the hose. Which technician is correct?
Neither Technician A nor B
How many rotations of the crankshaft are required to complete each stroke of a four-stroke cycle engine?
One-half
What color are the high-voltage cables used on hybrid electric or electric vehicles?
Orange
Which of the following safety tips should be kept in mind when working with hand tools?
Never use a pipe extension or other type of "cheater bar" on a wrench or ratchet handle.
What prevents the fuel pump inside the fuel tank from catching the gasoline on fire?
No air is around the motor brushes.
Upon inspection of a failed ETC system in a General Motors vehicle, you find that the throttle body control has to be replaced. After replacing this, the throttle body relearn procedure must be performed. To do this, which of the following criteria needs to be met?
No throttle diagnostic trouble codes (DTCs) should be set.
A technician is checking the operation of the electronic throttle control system by depressing the accelerator pedal when the gear selector is in PARK. What is the most likely result if the system is functioning correctly?
No throttle movement
Hydraulic electronic unit injection (HEUI) systems use ________ to prevent fuel and oil from mixing, causing engine damage, or creating performance problems.
O-rings
Which of the following is true about Occupational Safety and Health Administration (OSHA)?
OSHA has established certain levels to keep asbestos exposure in check.
How many ignition coil(s) are used in waste-spark systems to fire the spark plugs for two cylinders at the same time?
One
Where is the injector located in a spray-guided combustion engine design?
The combustion chamber
Technician A says that a crankshaft determines the stroke of an engine. Technician B says that the length of the connecting rod determines the stroke of an engine. Which technician is correct?
Technician A only
Technician A says that a hoist can be stopped at any level as long as the safety latch engages. Technician B says that the vehicle should be hoisted to the top of the hoist travel for safety. Which technician is correct?
Technician A only
Two technicians are discussing the use of a typical bench/pedestal-mounted grinder. Technician A says that a wire brush wheel can be used to clean threads. Technician B says that the grinding stone can be used to clean threads. Which technician is correct?
Technician A only
Upon inspection of the color of wires at the injectors, you find that one of the wires is of a different color in each of the injectors. Technician A says the injectors are fired in groups/batches. Technician B says that the injectors are sequentially fired. Who is correct?
Technician B
Technician A says that fuel pump modules are spring-loaded so that they can be compressed to fit into the opening. Technician B says that they are spring-loaded to allow for expansion and contraction of plastic fuel tanks. Which technician is correct?
Technician B only
Technician A says that the port fuel-injection injectors operate using 5 volts form the computer. Technician B says that sequential fuel injectors all use a different wire color on the injectors. Which technician is correct?
Technician B only
Technician A says that when going to high altitudes, engines produce lower power and the octane rating of fuel is high. Technician B says that most engine control systems can compensate the air-fuel mixture for changes in altitude. Which technician is correct?
Technician B only
Two technicians are discussing the term "turbo lag." Technician A says that it refers to the delay between when the exhaust leaves the cylinder and when it contacts the turbine blades of the turbocharger. Technician B says that it refers to the delay in boost pressure that occurs when the throttle is first opened. Which technician is correct?
Technician B only
Two technicians are discussing torque wrenches. Technician A says that a torque wrench is capable of tightening a fastener with more torque than a conventional breaker bar or ratchet. Technician B says that a torque wrench is used to apply a known amount of force to the fastener. Which technician is correct?
Technician B only
________________ was added to gasoline in the early 1920s to reduce the tendency to knock.
Tetraethyl lead (TEL)
Which of the following is true about the ASD relay?
The ASD relay does not supply voltage to the coil unless the engine is cranking and the computer senses a crankshaft sensor signal.
The air filter restriction indicator uses what to detect when it signals to replace the filter?
The amount of restriction measured in inches of water
Which of the following is true about nut splitters?
The entire nut splitter should not be rotated.
Which of the following may be a symptom of injector O-ring trouble in a HEUI system?
The fuel filter element turning black
Which of the following is true regarding port fuel-injection system?
The fuel injectors located at the bends of the fuel rail tend to become clogged.
Which of the following is true about aviation tin snips?
The handles of aviation tin snips are color coded for easy identification.
Which of the following occurs if a vacuum leak occurs on an engine equipped with a mass air-flow type fuel-injection system?
The idle speed is likely lower due to the leaner-than-normal air-fuel mixture.
Which of the following is true for removing and replacing spark plugs?
The labor required to remove and replace (R & R) spark plugs is the same whether the spark plugs are replaced or cleaned.
Which of the following statements is true?
The lift pump is a low-pressure, high-volume pump, while the injection pump is a high-pressure, low-volume pump.
A fuel line with a yellow tag on it has been removed from a Gasoline Direct Injection (GDI)-equipped engine. What action should the technician take when reinstalling the fuel line?
The line must be replaced.
Which of the following is a reason why the throttle body should not be cleaned with liquid spray cleaner?
The liquid spray could damage the sensors.
In a vehicle using a fuel injection system, spring-type clamps may not be used on the fuel-injected engine. This is true because:
The pressure from the fuel injected engine.
When refueling a CNG vehicle, why is it recommended that the tank be filled to a high pressure?
The range of the vehicle is increased.
In mass airflow fuel injections systems, injector pulse width is calculated as airflow/RPM. Which among the following sensor values can affect the formula?
Throttle position
Why is a vacuum line attached to a fuel-pressure regulator on many port-fuel-injected engines?
To create an equal pressure drop across the injectors
Which of these is not the purpose of an ignition distributor used in older engines?
To detect misfire
Why are the EGR gases cooled before entering the engine on some engines?
To increase effectiveness at controlling NOx emissions
Why do many port fuel-injected engines use long intake manifold runners?
To increase low-RPM torque
What is the purpose of an intercooler?
To reduce the temperature of the air entering the engine
Which of the following is a role of fire blankets in the shop?
To smother the fire
What is the main purpose of diesel oxidation catalysts (DOC)?
To start regeneration of the diesel particulate filter (DPF)
How many times must the resistance of injectors be measured while checking fuel injector resistance?
Twice
An SOHC V-8 engine has how many SOHC camshafts?
Two
________ soot particles make up 80% to 95% of soot generated by diesel combustion.
Ultrafine
Which of the following statements stands TRUE as the process for reformulating gasoline by gasoline refiners?
Use additives that contain at least 2% oxygen by weight and reduce the additive benzene to a maximum of 1% by volume.
Carbon deposits in the intake valve and the fuel injector is one of the major issue in the GDI system. Which of the following is a measure suggested by experts to tackle this issue?
Use of Techron® fuel system dispersant
Which of these rules applies to diesel fuel and gasoline storage?
Use storage cans that have a flash-arresting screen at the outlet.
Which one of the following statements is true about used oil?
Used oil is a synthetic oil.
Which can be used to test for a fault with a cylinder on a waste-spark system?
Using short sections of rubber hose attached to the coil terminals
Which tool has a replaceable cutting edge?
Utility knife
Which of the following terms is not used for a variable intake manifold?
Variable motion control
Name the kind of vehicle where the Powertrain Control Module adjusts the injector pulse-width and the ignition timing to optimize engine operation to the use of E85.
Virtual flexible fuel vehicle
Which of the following can be used to extinguish only class A fires?
Water
What fuel system component is used in a vehicle equipped with a diesel engine that is seldom used on the same vehicle when it is equipped with a gasoline engine?
Water-fuel separator
What clogs fuel filters when the temperature is low on a vehicle that uses diesel fuel?
Wax
When does the PCM perform a self-test of the ETC system?
When the ignition switch is first rotated to the on position before the engine starts
What color exhaust smoke occurs most often during cold engine starts because the smoke is usually condensed fuel droplets?
White
Methanol is also called ___________.
Wood alcohol
In Canada, material safety data sheets (MSDS) information is called ________.
Workplace Hazardous Materials Information Systems (WHMIS)
The safety glasses worn by the workers/technician should be of ANSI ________.
Z87.1
A customer drives a Chrysler vehicle with ETC with complaints such as engine speed is limited to 1,200 to 1,600 RPM, failed cruise control system, a slow responsive accelerator pedal, and a set of diagnostic trouble codes. There is a red lightning bolt symbol on the dash upon inspection. These are all indications of ________.
a failure in the TP and/or the APP sensors
An hydraulic press is used with a(n) ________ to remove a bearing from a shaft.
bearing splitter
As engine speed increases, the timing of the spark in the cylinder must be ________.
advanced
Before electronic throttle control, the idle speed was controlled by using by using ________.
air bypass control unit
Placing the ______ next to the throttle body would cause engine and vehicle design problems.
air cleaner housing
A(n) ________ is used to clean equipment and other purposes where a stream of air would be needed.
air-blow gun
The high-pressure fuel pressure is regulated by using _________________.
an electric pressure-control valve
The alcohol product in the dehydration stage is known as _______________.
anhydrous ethanol
Vapor lock can occur as a result of excessive heat near fuel lines__________________.
as a result of excessive heat near fuel lines
Asbestos exposure can cause formation of scar tissue in the lungs. This condition is called ______________.
asbestosis
Technician A says that spark knock, ping, and detonation are different names for abnormal combustion. Technician B says that any normal combustion raises the temperature and pressure inside the combustion chamber and can cause severe engine damage. Which technician is correct?
both techs
In a mechanical returnless fuel system, the ________ in the fuel tank controls fuel line pressure.
bypass regulator
A customer brings a vehicle with GDI and complains that the engine starts and idles, but lacks the power to accelerate. This could be because of ________.
carbon deposits on the intake valve
Exhaust hoses should be used because one of the exhaust gases is deadly in high concentration. This gas is ______________.
carbon monoxide (CO)
A lack of power from an engine equipped with gasoline direct injection could be due to _________.
carbon on the injectors
Atmospheric nitrogen and oxygen are combined into a single molecule of nitrous oxide by heat and a ________.
catalyst
Biodiesel has a higher ____________ number than conventional diesel.
cetane
For ease of working, the area of the vehicle on which the technician is working should be at _______ level.
chest
During the power stroke in a four-stroke engine, the intake valve is ________ and the exhaust valve is _______.
closed, closed
A COP ignition system can be called all of the following, EXCEPT ________.
coil-spark system
The chemical energy in fuel is converted to heat by the burning of the fuel at a controlled rate. This process is called _______________.
combustion
All of the following are the proper ways to dispose of a drained oil filter except ______________.
considered to be hazardous waste and disposed of accordingly
A bolt extractor is commonly called _______.
easy out
High-pressure common rail (HPCR) fuel delivery systems are able to accurately control the combustion process to deliver maximum efficiency at minimum noise and emissions because they:
employ computer-controlled solenoids for opening injectors.
The increase and decrease in in engine speed when the engine is warm and restarted is often called __________.
engine flare
Before lowering the vehicle, the technician should do all of the following, except:
ensure that the direction of control remains the same.
Horsepower is expressed in units of ________.
foot-pounds per minute
Pad extensions may be used to gain access to the ________ of a vehicle.
frame
Engines used in automobiles are ____________ combustion engines while steam engines are ___________ combustion engines.
internal, external
A spark tester should be used to check for spark because __________.
it can detect a cracked spark plug
Avoid topping off the fuel tank because _______________________.
it can saturate the charcoal canister
A safety stand is also called a _________________.
jack stand
Proper care of shop equipment includes ______________.
keeping equipment lubricated
Most vehicles will be properly positioned when the _____________ tire is centered on the tire pad.
left front
Typical primary coil resistance specifications usually range from __________ ohms.
less than 1 to 3
Poor engine performance could be the result of all of the following EXCEPT __________.
low battery voltage
A horizontally opposed multicylinder engine design, also called boxer or pancake engine design, _________ the vehicle's center of gravity.
lowers
When CNG is processed, 93% of it is ____________.
methane
Biodiesel is_________.
mono-alkyl esters mixed with diesel fuel
The ________ smooths out the pressure pulses in the exhaust system, allowing them to be released at an even and constant rate.
muffler
To grip large objects, ________ pliers are commonly used.
multigroove
A(n) __________ engine draws in the air-fuel mixture at atmospheric pressure.
naturally aspirated
When ________ is injected into an engine along with gasoline, engine power is increased.
nitrous oxide
A(n) _________ electrically replaces the injector in the circuit and flashes if the injector circuit is working correctly.
noid light
A hydrokinetic fuel pump is a ________.
nonpositive displacement pump
A reluctor is a ________________.
notched ring or pointed wheel
A distributor cap can be inspected for all of the following, EXCEPT:
pressure seals.
In an electronic returnless fuel system, rail pressure is regulated by a _______.
pressure transducer under controller
A(n) _______ is employed at the tank to relieve overpressure due to thermal expansion of fuel.
pressure vent valve
The flywheel end of the engine to which power is applied to drive the vehicle is called the ________ end of the engine while the front of the engine where accessory belts are used is called the ____________ end of the engine.
principal, nonprincipal
Liquefied petroleum gas (LPG) is also called ___________.
propane
When working with hand tools, always ______________.
pull a wrench—don't push a wrench
The term "volumetric efficiency" refers to the ability of an engine to _____________.
pull in air
When service work is finished, the hoist must be _________ slightly and the safety mechanism ________ before using hydraulics to ________ the vehicle.
raised, released, lower
Dampeners are used on some fuel rails to ______________.
reduce noise
The process of purging soot from the diesel exhaust particulate filter (DPF) is called ___________.
regeneration
A die grinder is commonly used to _______.
remove gaskets
The ________ measures the voltage required to jump the gap between the rotor and the inserts of the distributor cap.
rotor gap voltage test
An engine stand is designed to _____________.
safely hold an engine
Many smaller fasteners are removed using a _________.
screwdriver
Fuel lines are constructed from _____________.
seamless steel tubing
The ideal ratio at which all the fuel combines with all the oxygen in air and burns completely is called the _____________ ratio.
stoichiometric
Tall safety stands would be used to ______________.
support an engine while the vehicle is hoisted
Hoists with arms of equal length are called ____________.
symmetrical lifts
The _________ carries the exhaust gases from the muffler to the air, away from the vehicle.
tailpipe
The high-pressure fuel pumps used in gasoline direct injection (GDI) systems are powered by ______.
the camshaft
When servicing an engine equipped with GDI, you find that the ball-ends deform when tightening the high-pressure lines. This happens because ___________.
the lines are being reused
The coolant flow through the radiator is controlled by the _______________.
thermostat
The use of a variable vane turbocharger allows the elimination of a(n) ___________.
turbocharger wastegate
A hoist with asymmetrical arms means it ______________.
uses different-length lift arms
A creeper should be stored ______________.
vertically
Hazardous materials include all of the following except ______________.
water
Hoists are rated by the maximum ______________________.
weight they can lift safely
Most bench grinders are equipped with a grinding stone on one side and a ________ on the other side.
wire brush wheel
All of the following are causes of carbon fouling, EXCEPT:
worn piston rings.
Aisles leading to the emergency exit must be marked with _____ at least ____ wide.
yellow paint or tape; 5 cm
Natural gas can be turned into a liquid if cooled to below_____________.
−260°F (−162°C).
