Chapter 24 - Engine Performance 1
Exam Questions & Answers (Grade
A+)
True or false? Higher Compression ratios tend to speed up
combustion. -
correct answer ✅True
True or false? The PCM can turn off the A/C compressor when the
engine is operating at full throttle. -
correct answer ✅True
True or false? During the EVAP monitor vacuum leak test, the
canister vent solenoid is held open. -
correct answer ✅False
True or false? The MIL light should illuminate when the ignition
switch is turned to the run position [engine not running] and go out
within a few seconds after the engine is started. -
correct answer ✅True
True or false? Scan tools can be used to cycle on and off some
actuators such as injectors, vacuum solenoids, idle air control
motors, and the like. -
correct answer ✅True
, Chapter 24 - Engine Performance 1
Exam Questions & Answers (Grade
A+)
True or false? An air fuel ratio of 14.7 to 1 is called stochiometric
mixture. -
correct answer ✅True
What is this picture of?
A. Oxygen sensor
B. Coolant Temp sensor
C. Exhaust temp sensor
D. Map sensor -
correct answer ✅A. Oxygen sensor
Engine vacuum is being discussed. Technician A says that when the
engine is operating under light loads, engine vacuum is high.
Technician B says that engine vacuum is low when the engine is
operated under heavy loads. Who is correct? -
correct answer ✅Both A and B
Ignition spark typically occurs a few degrees ______.
A. before top dead center (BTDC)
Exam Questions & Answers (Grade
A+)
True or false? Higher Compression ratios tend to speed up
combustion. -
correct answer ✅True
True or false? The PCM can turn off the A/C compressor when the
engine is operating at full throttle. -
correct answer ✅True
True or false? During the EVAP monitor vacuum leak test, the
canister vent solenoid is held open. -
correct answer ✅False
True or false? The MIL light should illuminate when the ignition
switch is turned to the run position [engine not running] and go out
within a few seconds after the engine is started. -
correct answer ✅True
True or false? Scan tools can be used to cycle on and off some
actuators such as injectors, vacuum solenoids, idle air control
motors, and the like. -
correct answer ✅True
, Chapter 24 - Engine Performance 1
Exam Questions & Answers (Grade
A+)
True or false? An air fuel ratio of 14.7 to 1 is called stochiometric
mixture. -
correct answer ✅True
What is this picture of?
A. Oxygen sensor
B. Coolant Temp sensor
C. Exhaust temp sensor
D. Map sensor -
correct answer ✅A. Oxygen sensor
Engine vacuum is being discussed. Technician A says that when the
engine is operating under light loads, engine vacuum is high.
Technician B says that engine vacuum is low when the engine is
operated under heavy loads. Who is correct? -
correct answer ✅Both A and B
Ignition spark typically occurs a few degrees ______.
A. before top dead center (BTDC)
