AUTOMOTIVE ENGINE PERFORMANCE FINAL EXAM
UPDATED ACTUAL QUESTIONS AND CORRECT
ANSWERS
Question:
1. In a GDI system (gasoline direct injection) the injector
sprays fuel into the ______.
Answer:
d.
cylinders (combustion chamber)
Question:
2. Which of the following is NOT an advantage of an
electronic spark control system?
Answer:
b.
It allows lower compression ratio engines to be as efficient as higher compression
ratio engines
Question:
3. Waste spark EI systems are being discussed. Technician A
says a high-resistance spark plug won't affect the firing of
its companion spark plug. Technician B says improper
spark plug torque can't cause an engine misfire. Who is
correct?
Answer:
d. neither A nor B
Question:
4. What is an advantage of EI ignition?
Answer:
d. All of the answers are correct.
Question:
5. Technician A says a plug with a V-notch ground electrode
will have two electric arcs jumping across the spark plug
gap each time the spark plug fires. Technician B says a
spark plug gap that is too wide requires higher voltage to
jump the gap, which can cause a misfire. Who is correct?
Answer:
b. B only
,Question:
6. OBD II technology is being discussed. Technician A says
the OBD II system has the ability to store a freeze frame
(snapshot) of the operating conditions that existed when
the fault occurred. Technician B says vehicle identification
must be transmitted automatically to the scan tool. Who
is correct?
Answer:
c. Both A and B
Question:
7. 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:
d.
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
Question:
8. Two technicians are discussing OBD-II monitor readiness
status. Technician A says that the vehicle must be driven
through a drive cycle that includes several minutes of
idle, low-speed cruise, medium-speed cruise, and
deceleration before all monitors can be performed.
Technician B says all monitors can be performed in five
minutes of fast idling. Who is correct?
Answer:
a. A only
Question:
9. The two types of ignition systems are EI (electronic
ignition) and ______.
Answer:
b. DI (distributor ignition)
, Question:
10. Two technicians are discussing testing switch type
sensors. Technician A uses an ohmmeter. Technician B
uses a voltmeter. Who is correct?
Answer:
c. both A and B
Question:
11. In EI systems using one ignition coil for every two
cylinders, Technician A says two plugs fire at the same
time, with one wasting the spark on the exhaust stroke.
Technician B says one plug fires in the normal direction
and the other in reversed polarity. Who is correct?
Answer:
c. both A and B
Question:
12. A vehicle towed into the shop will crank but won't start. A
quick check under the hood reveals that the spark plugs
are not firing and the injectors are not receiving a pulse
from the PCM. The technician notices that the MIL light
does not come on when the key is turned to the run
position. What should he do next?
Answer:
a.
Check the PCM's fuses, power wires, and ground wires
Question:
13. Ignition timing is being discussed. Technician A says when
the engine idle speed moves away from the desired idle
speed, the PCM will adjust the timing to stabilize the
engine speed. Technician B says when a knock is
detected, the PCM retards the timing in fixed steps until
the knock disappears. Who is correct?
Answer:
c. both A and B
Question:
14. Besides the tailpipe, hydrocarbons (HC) can also be
emitted from the _______.
Answer:
d. all of the answers are correct.
UPDATED ACTUAL QUESTIONS AND CORRECT
ANSWERS
Question:
1. In a GDI system (gasoline direct injection) the injector
sprays fuel into the ______.
Answer:
d.
cylinders (combustion chamber)
Question:
2. Which of the following is NOT an advantage of an
electronic spark control system?
Answer:
b.
It allows lower compression ratio engines to be as efficient as higher compression
ratio engines
Question:
3. Waste spark EI systems are being discussed. Technician A
says a high-resistance spark plug won't affect the firing of
its companion spark plug. Technician B says improper
spark plug torque can't cause an engine misfire. Who is
correct?
Answer:
d. neither A nor B
Question:
4. What is an advantage of EI ignition?
Answer:
d. All of the answers are correct.
Question:
5. Technician A says a plug with a V-notch ground electrode
will have two electric arcs jumping across the spark plug
gap each time the spark plug fires. Technician B says a
spark plug gap that is too wide requires higher voltage to
jump the gap, which can cause a misfire. Who is correct?
Answer:
b. B only
,Question:
6. OBD II technology is being discussed. Technician A says
the OBD II system has the ability to store a freeze frame
(snapshot) of the operating conditions that existed when
the fault occurred. Technician B says vehicle identification
must be transmitted automatically to the scan tool. Who
is correct?
Answer:
c. Both A and B
Question:
7. 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:
d.
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
Question:
8. Two technicians are discussing OBD-II monitor readiness
status. Technician A says that the vehicle must be driven
through a drive cycle that includes several minutes of
idle, low-speed cruise, medium-speed cruise, and
deceleration before all monitors can be performed.
Technician B says all monitors can be performed in five
minutes of fast idling. Who is correct?
Answer:
a. A only
Question:
9. The two types of ignition systems are EI (electronic
ignition) and ______.
Answer:
b. DI (distributor ignition)
, Question:
10. Two technicians are discussing testing switch type
sensors. Technician A uses an ohmmeter. Technician B
uses a voltmeter. Who is correct?
Answer:
c. both A and B
Question:
11. In EI systems using one ignition coil for every two
cylinders, Technician A says two plugs fire at the same
time, with one wasting the spark on the exhaust stroke.
Technician B says one plug fires in the normal direction
and the other in reversed polarity. Who is correct?
Answer:
c. both A and B
Question:
12. A vehicle towed into the shop will crank but won't start. A
quick check under the hood reveals that the spark plugs
are not firing and the injectors are not receiving a pulse
from the PCM. The technician notices that the MIL light
does not come on when the key is turned to the run
position. What should he do next?
Answer:
a.
Check the PCM's fuses, power wires, and ground wires
Question:
13. Ignition timing is being discussed. Technician A says when
the engine idle speed moves away from the desired idle
speed, the PCM will adjust the timing to stabilize the
engine speed. Technician B says when a knock is
detected, the PCM retards the timing in fixed steps until
the knock disappears. Who is correct?
Answer:
c. both A and B
Question:
14. Besides the tailpipe, hydrocarbons (HC) can also be
emitted from the _______.
Answer:
d. all of the answers are correct.
