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WorksheetsAUT108 Mid Term Exam
Total questions: 40
Worksheet time: 20mins
When the voltage reaches the point where current is flowing in the secondary circuit, the _______ drops to a much lower level, just sufficient enough to sustain current flow and the spark.
Select one:
Reserve voltage
Low voltage
High voltage
Required voltage
Which of the following does the ignition system use to convert relatively low-voltage and high-current flow into very high-voltage and very low-current flow?
Select one:
Induction coil
Ignition switch
Ignition module
Spark plugs
The original ignition system found in vehicles was the:
Select one:
waste spark system.
electronic ignition system.
contact breaker points system.
distributorless ignition system.
The primary winding of the ignition coil has approximately _______ turns of enameled copper wire.
Select one:
A few hundred
1,000
15,000
None of the above
The vacuum advance mechanism controls ignition advance in relation to engine ________.
Select one:
Load
Temperature
Speed
MPH
What type of ignition system is this from?
Breaker point
Electronic
Coil on plug
Distributor less
Most current production gasoline engines use ____ ignition coil(s) for each cylinder.
Select one:
One
Two
Three
Four
In distributorless ignition systems, signals from sensors are to calculate engine _______ and determine engine _______.
Select one:
Torque, speed
Speed, position
Firing order, position
Firing order, dwell angle
The waste cylinder is the cylinder on the compression stroke.
Select one
True
False
Atmospheric pressure is _____ psi at sea level.
Select one:
14.5
14.6
14.7
14.8
Tech A says that high octane fuel is harder to ignite than lower octane. Tech B says that using high octane fuel in an engine designed for lower octane will produce better fuel economy and power. Who is correct?
Select one:
Tech A
Tech B
Both A and B
Neither A nor B
The most important job of the fuel system is to optimize engine performance while:
Select one:
keeping fuel consumption and emissions to a minimum.
keeping car owners happy with acceptable vehicle performance.
making sure all DMV rules are adhered to.
making sure the highest miles-per-gallon are achieved.
Which of these fuel characteristics helps to prevent the air fuel mixture from spontaneously igniting in the combustion chamber?
Select one:
The ignition temperature
The cetane rating
The octane rating
The antiknock rating
The sock typically consists of a ______, which prevents most small particles from being drawn into the fuel pump and sent through the rest of the fuel system.
Select one:
Paper filter
Fine mesh
Plastic screen
Aluminum alloy screen
A return line is always provided to allow excess fuel to return to the tank.
Select one:
True
False
The ________ design uses a one-way valve to hold pressure in the system while the pressure tester is connected and disconnected to the fuel rail.
Select one:
O-ring valve
Quick-connect valve
Schrader valve
Fuel pressure tester valve
What is the purpose of the venturi?
Select one:
To make the air speed up as it passes through
To ensure the proper air fuel mixture is available
To provide extra fuel for accelerating
To make sure an adequate supply of fuel is available
The carburetor does all of the following EXCEPT:
Select one:
control the delivery of the mixture to the intake system.
atomize the fuel.
mix the fuel with air.
compress the fuel for delivery.
A fuel pump can be tested using a lab scope and a low-amp clamp to:
Select one:
graph the current flow.
measure the fuel pressure.
measure the volume.
test for pressure loss due to leaks.
Tech A says that most electric fuel pumps are now mounted inside of the fuel tank. Tech B says that fuel flows through the center of the electric pump and is used to cool the pump. Who is correct?
Select one:
Tech A
Tech B
Both A and B
Neither A nor B
After replacing an external fuel filter, check it for leaks by:
Select one:
cranking the engine for 5 seconds.
cycling the ignition key on and off several times.
starting the vehicle and watching for drops of fuel.
wiggling the connections and watching for moisture.
Tech A says that the more oxygen the engine uses means the engine is running a rich mixture. Tech B says that the less oxygen the engine uses means the engine is running a lean mixture. Who is correct?
Select one:
Tech A
Tech B
Both Techs A and B
Neither Tech A nor B
Types of fuel line connections include all of these EXCEPT:
Select one:
banjo bolt fittings.
quick couplings.
flare fittings.
compression fittings.
________ employ electronically controlled injectors to spray the fuel into either the intake manifold or the directly into the cylinder.
Select one:
Carbureted systems
EFI systems
Fuel rails
Metering jets
Fuel Injector
Ignition Coil
Fuel Pressure Regulator
Electric Fuel Pump
Sequential injection means injection occurs in the sequence of the firing order.
Select one:
True
False
EFI systems employ electronically controlled injectors to spray the fuel into the ________.
Select one:
Intake system
Cylinder directly
Either A or B
None of the above
Which of the following is NOT one of the three basic EFI systems?
Select one:
Throttle body injection (TBI)
Multipoint fuel injection (MPFI)
Computer-controlled carburetor injection
Gasoline direct injection (GDI)
Pre-ignition occurs before normal combustion, when something in the combustion chamber heats up enough to ignite the mixture before the spark plug fires.
Select one:
True
False
Electronic fuel injection (EFI) systems may be either a circulation-type system or a(n):
Select one:
downdraft type.
updraft type.
endless type.
returnless type.
All of the following are valid ways to relieve the static pressure in the fuel system before removing the fuel lines EXCEPT:
Select one:
removing the fuel pump relay or the fuel pump fuse and running the engine until it dies.
connecting a fuel pump pressure gauge (that has a bleed valve) to the fuel rail test point, and releasing the excess pressure from the system into a gas can.
on GDI equipped engines, using a scan tool to release the fuel pressure.
using fuel filter lines.
Tech A says that electric fuel pump pressure can often be tested by accessing a test port. Tech B says that electric fuel pump volume can be affected by the condition of the fuel injectors. Who is correct?
Select one:
Tech A
Tech B
Both Techs A and B
Neither Tech A nor B
The pressure between the pump and the injectors can be maintained by _________.
Select one:
Varying the speed of the pump
Input from the driver
Both A and B
None of the above
Tech A says that fuel injectors can be checked for the specified amount of resistance. Tech B says that an injector pressure drop test can determine if an injector is restricted with deposits. Who is correct?
Select one:
Tech A
Tech B
Both A and B
Neither A nor B
Tech A says that PFI fuel injectors need about 46 to 65 psi of fuel pressure to make them operate. Tech B says that the GDI fuel injectors will require upwards of 2000 psi.
Tech A
Tech B
Both Tech A & Tech B
Neither Tech A or Tech B
Match the following:
Sparkplug
Ignites the fuel mixture in the cylinder
Ignition coil
Supplies the secondary voltage needed to fire a sparkplug
Ignition module or PCM
Determines when to send the signal to the ignition coil(s)
COI Ignition system
The most common ignition system used on todays cars
Breaker point ignition
Mechanical ignition system
What type of fuel injection system is shown?
TBI
PFI
GDI
SFI
What part is this?
Carburetor
TBI Injection system
Fly by wire Throttle Body
Throttle Body
________ employ electronically controlled injectors to spray the fuel into either the intake manifold or the directly into the cylinder.
Select one:
Carbureted systems
EFI systems
Fuel rails
Metering jets
Tech A says that the more oxygen the engine uses means the engine is running a rich mixture. Tech B says that the less oxygen the engine uses means the engine is running a lean mixture. Who is correct?
Select one:
Tech A
Tech B
Both Techs A and B
Neither Tech A nor B
