AUT-135 Final Exam Questions And Answers.
Technician A says an 87 octane fuel is a blend of 87 percent octane and 13 percent
ethanol. Technician B says an 87 octane fuel will experience detonation in a test engine
at the same temperatures and pressures as a sample fuel blend of 87 percent isooctane
and 13 percent heptane. Who is correct? - answer;-b only
_____ emissions are caused largely by unburned fuel from the combustion chambers. -
answer;-HC
Which of the following should NOT be used to lubricate injector O-rings? - answer;-
silicone greese
The dwell period on a modern electronic ignition system ______. - answer;-increases
[lengthens] as engine RPM increases
When viewing injector patterns on a lab scope, the injector pulse end with a ______. -
answer;-last upward spike
Technician A says some BEVs use liquid to heat the passenger compartment.
Technician B says some BEVs use an electric resistance heater with a fan to heat the
passenger compartment. Who is correct? - answer;-both
Which of the following statements is not true? - answer;-A type B misfire will cause the
MIL light to flash
Trouble codes are being discussed. Technician A says that the first time the system
detects a fault, a pending code is set. Technician B says that a pending code will turn
on the MIL light. Who is correct? - answer;-a only
Crankshaft sensors are being discussed. Technician A says the signal from a Hall-effect
CKP cannot be used to synchronize fuel injector timing with the engine. Technician B
says some early distributor ignition systems relied on photoelectric sensors to monitor
crankshaft position. Who is correct? - answer;-b only
Technician A says the production of CO2 is directly related to the amount of fuel
consumed; therefore, more fuel-efficient engines produce less CO2. Technician B says
imposing new CAFE [fuel economy] standards will, in effect, reduce CO2 emissions.
Who is correct? - answer;-both
Compressed hydrogen used in FCEVs [fuel cell electric vehicle] is stored at
approximately ______ psi. - answer;-5,000
Technician A says diesel engines can be used in a hybrid powertrain. Technician B
says a gasoline engine is normally used in hybrid powertrain. Who is correct? - answer;-
both
, AUT-135 Final Exam Questions And Answers.
A vehicle with a DTC for an engine coolant temperature out of range code is being
tested. The serial data stream shows the coolant temperature to be 198 degrees
Fahrenheit. When the technician tests the resistance between the ETC terminals, he
finds infinite resistance. The specifications call for 20 to 40 ohms at 200 degrees
Fahrenheit. After the ECT is replaced and the code is erased, the system runs normally
and the code and MIL illumination do not reoccur. How is this possible? - answer;-When
the ECT failed, the PCM substituted a nominal ECT value that allowed the engine to run
in limp home mode; the substituted value was displayed by the scan tool
Technician A says electronic secondary air systems used on OBD-II vehicles use an
electrically driven air pump. Technician B says the check valves in the secondary air
tubes prevent converter overheating if the electric air pump fails. Who is correct? -
answer;-a only
Technician A says increasing the Reid vapor pressure [RVP] will help the engine start
easier in cold weather. Technician B says increasing the RVP will increase the
possibility of fuel boiling [vapor lock] in summer driving. Who is correct? - answer;-both
Technician A says the inertia switch has a reset button that must be depressed for at
least one second before the pump will operate again. Technician B says the inertia
switch is triggered by the ABS control module. Who is correct? - answer;-a only
Diagnostic trouble codes are being discussed. Technician A says a P0442 is a
manufacturer's code and means different things, depending on what manufacturer built
the car. Technician B says that a P0304 code is a universal code that means the same
thing no matter what manufacturer built the car. Who is correct? - answer;-b only
Technician A says a three-way catalytic converter [TWC] oxidizes carbon monoxide and
hydrocarbons into carbon dioxide and water. Technician B says a TWC reduces NOx
into nitrogen and carbon dioxide. Who is correct? - answer;-both
Technician A says TBI systems use top fuel-feeding injectors. Technician B says PFI
systems use bottom fuel-feeding injectors. Who is correct? - answer;-neither
Which of the following is NOT a spark plug thread diameter? - answer;-9/16 in
Which of the following may result from too little EGR flow? - answer;-all correct
An APP [accelerator pedal position] sensor is found on vehicles with ______. - answer;-
throttle by water
On an oscilloscope, which section ends with the primary coil current off signal? -
answer;-dwell
Technician A says an 87 octane fuel is a blend of 87 percent octane and 13 percent
ethanol. Technician B says an 87 octane fuel will experience detonation in a test engine
at the same temperatures and pressures as a sample fuel blend of 87 percent isooctane
and 13 percent heptane. Who is correct? - answer;-b only
_____ emissions are caused largely by unburned fuel from the combustion chambers. -
answer;-HC
Which of the following should NOT be used to lubricate injector O-rings? - answer;-
silicone greese
The dwell period on a modern electronic ignition system ______. - answer;-increases
[lengthens] as engine RPM increases
When viewing injector patterns on a lab scope, the injector pulse end with a ______. -
answer;-last upward spike
Technician A says some BEVs use liquid to heat the passenger compartment.
Technician B says some BEVs use an electric resistance heater with a fan to heat the
passenger compartment. Who is correct? - answer;-both
Which of the following statements is not true? - answer;-A type B misfire will cause the
MIL light to flash
Trouble codes are being discussed. Technician A says that the first time the system
detects a fault, a pending code is set. Technician B says that a pending code will turn
on the MIL light. Who is correct? - answer;-a only
Crankshaft sensors are being discussed. Technician A says the signal from a Hall-effect
CKP cannot be used to synchronize fuel injector timing with the engine. Technician B
says some early distributor ignition systems relied on photoelectric sensors to monitor
crankshaft position. Who is correct? - answer;-b only
Technician A says the production of CO2 is directly related to the amount of fuel
consumed; therefore, more fuel-efficient engines produce less CO2. Technician B says
imposing new CAFE [fuel economy] standards will, in effect, reduce CO2 emissions.
Who is correct? - answer;-both
Compressed hydrogen used in FCEVs [fuel cell electric vehicle] is stored at
approximately ______ psi. - answer;-5,000
Technician A says diesel engines can be used in a hybrid powertrain. Technician B
says a gasoline engine is normally used in hybrid powertrain. Who is correct? - answer;-
both
, AUT-135 Final Exam Questions And Answers.
A vehicle with a DTC for an engine coolant temperature out of range code is being
tested. The serial data stream shows the coolant temperature to be 198 degrees
Fahrenheit. When the technician tests the resistance between the ETC terminals, he
finds infinite resistance. The specifications call for 20 to 40 ohms at 200 degrees
Fahrenheit. After the ECT is replaced and the code is erased, the system runs normally
and the code and MIL illumination do not reoccur. How is this possible? - answer;-When
the ECT failed, the PCM substituted a nominal ECT value that allowed the engine to run
in limp home mode; the substituted value was displayed by the scan tool
Technician A says electronic secondary air systems used on OBD-II vehicles use an
electrically driven air pump. Technician B says the check valves in the secondary air
tubes prevent converter overheating if the electric air pump fails. Who is correct? -
answer;-a only
Technician A says increasing the Reid vapor pressure [RVP] will help the engine start
easier in cold weather. Technician B says increasing the RVP will increase the
possibility of fuel boiling [vapor lock] in summer driving. Who is correct? - answer;-both
Technician A says the inertia switch has a reset button that must be depressed for at
least one second before the pump will operate again. Technician B says the inertia
switch is triggered by the ABS control module. Who is correct? - answer;-a only
Diagnostic trouble codes are being discussed. Technician A says a P0442 is a
manufacturer's code and means different things, depending on what manufacturer built
the car. Technician B says that a P0304 code is a universal code that means the same
thing no matter what manufacturer built the car. Who is correct? - answer;-b only
Technician A says a three-way catalytic converter [TWC] oxidizes carbon monoxide and
hydrocarbons into carbon dioxide and water. Technician B says a TWC reduces NOx
into nitrogen and carbon dioxide. Who is correct? - answer;-both
Technician A says TBI systems use top fuel-feeding injectors. Technician B says PFI
systems use bottom fuel-feeding injectors. Who is correct? - answer;-neither
Which of the following is NOT a spark plug thread diameter? - answer;-9/16 in
Which of the following may result from too little EGR flow? - answer;-all correct
An APP [accelerator pedal position] sensor is found on vehicles with ______. - answer;-
throttle by water
On an oscilloscope, which section ends with the primary coil current off signal? -
answer;-dwell
