Engine Performance Exam Questions
and Answers (Latest Update 2026)
Technician A says that spark knock, ping, and detonation are
different names for abnormal combustion. Technician B says that
any abnormal combustion raises the temperature and pressure
inside the combustion chamber and can cause severe engine
damage. Which technician is correct?
Technician A
Technician B
Both Technicians
Neither Technician -
correct answer ✅Both Technicians
What can be used to measure the alcohol content in gasoline?
Graduated cylinder
Electronic tester
Scan tool
Either Graduated cylinder or tester -
correct answer ✅Either Graduated cylinder or tester
,Engine Performance Exam Questions
and Answers (Latest Update 2026)
The gasoline burned inside the internal combustion engine is a type
of___________
carbon monoxide
hydrocarbon
compressed vapor
alcohol -
correct answer ✅hydrocarbon
Avoid topping off the fuel tank because
_______________________.
it can saturate the charcoal canister
the extra fuel simply spills onto the ground
the extra fuel increases vehicle weight and reduces performance
the extra fuel goes into the expansion area of the tank and is not
used by the engine -
correct answer ✅it can saturate the charcoal canister
Explain what stoichiometric means -
correct answer ✅The ideal air-fuel mixture in an internal
,Engine Performance Exam Questions
and Answers (Latest Update 2026)
combustion engine, where there is precisely enough air to
completely burn the fuel, resulting in efficient and balanced
combustion.
If it is tripped, which type of safety device will keep the electric fuel
pump from operating?
Roll-over valve
Inertia switch
Anti-siphoning valve
Check valve -
correct answer ✅Inertia switch
What prevents the fuel pump inside the fuel tank from catching the
gasoline on fire?
Electricity is not used to power the pump
No air is around the motor brushes
Gasoline is hard to ignite in a closed space
All of the above -
correct answer ✅No air is around the motor brushes
, Engine Performance Exam Questions
and Answers (Latest Update 2026)
A good fuel pump should be able to supply how much fuel per
minute?
¼ pint
½ pint
1 pint
0.5 to 0.8 gallons -
correct answer ✅0.5 to 0.8 gallons
Where is the fuel pump located on most vehicles today?
Near the fuel injectors under the hood
Attached to the outside of the fuel tank
Inside the fuel tank
Mounted on the engine -
correct answer ✅Inside the fuel tank
What are the two basic methods used for measuring the amount of
air the engine is breathing in, in order to match the correct fuel
delivery? -
correct answer ✅Mass Airflow Sensor (MAF) & Manifold Absolute
Pressure (MAP) Sensor
and Answers (Latest Update 2026)
Technician A says that spark knock, ping, and detonation are
different names for abnormal combustion. Technician B says that
any abnormal combustion raises the temperature and pressure
inside the combustion chamber and can cause severe engine
damage. Which technician is correct?
Technician A
Technician B
Both Technicians
Neither Technician -
correct answer ✅Both Technicians
What can be used to measure the alcohol content in gasoline?
Graduated cylinder
Electronic tester
Scan tool
Either Graduated cylinder or tester -
correct answer ✅Either Graduated cylinder or tester
,Engine Performance Exam Questions
and Answers (Latest Update 2026)
The gasoline burned inside the internal combustion engine is a type
of___________
carbon monoxide
hydrocarbon
compressed vapor
alcohol -
correct answer ✅hydrocarbon
Avoid topping off the fuel tank because
_______________________.
it can saturate the charcoal canister
the extra fuel simply spills onto the ground
the extra fuel increases vehicle weight and reduces performance
the extra fuel goes into the expansion area of the tank and is not
used by the engine -
correct answer ✅it can saturate the charcoal canister
Explain what stoichiometric means -
correct answer ✅The ideal air-fuel mixture in an internal
,Engine Performance Exam Questions
and Answers (Latest Update 2026)
combustion engine, where there is precisely enough air to
completely burn the fuel, resulting in efficient and balanced
combustion.
If it is tripped, which type of safety device will keep the electric fuel
pump from operating?
Roll-over valve
Inertia switch
Anti-siphoning valve
Check valve -
correct answer ✅Inertia switch
What prevents the fuel pump inside the fuel tank from catching the
gasoline on fire?
Electricity is not used to power the pump
No air is around the motor brushes
Gasoline is hard to ignite in a closed space
All of the above -
correct answer ✅No air is around the motor brushes
, Engine Performance Exam Questions
and Answers (Latest Update 2026)
A good fuel pump should be able to supply how much fuel per
minute?
¼ pint
½ pint
1 pint
0.5 to 0.8 gallons -
correct answer ✅0.5 to 0.8 gallons
Where is the fuel pump located on most vehicles today?
Near the fuel injectors under the hood
Attached to the outside of the fuel tank
Inside the fuel tank
Mounted on the engine -
correct answer ✅Inside the fuel tank
What are the two basic methods used for measuring the amount of
air the engine is breathing in, in order to match the correct fuel
delivery? -
correct answer ✅Mass Airflow Sensor (MAF) & Manifold Absolute
Pressure (MAP) Sensor
