Engine Performance 1 Midterm Exam
Actual Questions and Answers 2026
Turbochargers and superchargers force more fuel into the cylinders
to increase performance. -
correct answer ✅False
The PCV valve helps eliminate water and unburned fuel from the
engine. -
correct answer ✅True
The three-way catalyst is used to convert HC, CO2, and Nix into less
harmful gases. -
correct answer ✅False
Technician A says GDI (Gasoline Direct Injection) systems operate
under very high pressures. Technician B says GDI (Gasoline Direct
Injection) systems are no longer used in modern engines. Who is
correct? -
correct answer ✅Technician A
Which of the following will cause diagnostic codes to set? (MIL to
illuminate) -
correct answer ✅All of the above
, Engine Performance 1 Midterm Exam
Actual Questions and Answers 2026
The EGR valve is used to reduce: -
correct answer ✅Oxides of nitrogen
During cold engine start or acceleration, the air-fuel mixture may
be: -
correct answer ✅Richer than normal
Twenty inches of vacuum would be equivalent to how much
pressure absolute? -
correct answer ✅5 psia
Vacuum is formed on the: -
correct answer ✅Intake stroke
All of the following are responsible for air entering the combustion
chamber except: -
correct answer ✅momentum
Technician A says the relationship of the change of pressure and
altitude is inversely proportional. Technician B says atmospheric
pressure descreases as altitude increases. Who is correct? -
correct answer ✅Both A and B
Actual Questions and Answers 2026
Turbochargers and superchargers force more fuel into the cylinders
to increase performance. -
correct answer ✅False
The PCV valve helps eliminate water and unburned fuel from the
engine. -
correct answer ✅True
The three-way catalyst is used to convert HC, CO2, and Nix into less
harmful gases. -
correct answer ✅False
Technician A says GDI (Gasoline Direct Injection) systems operate
under very high pressures. Technician B says GDI (Gasoline Direct
Injection) systems are no longer used in modern engines. Who is
correct? -
correct answer ✅Technician A
Which of the following will cause diagnostic codes to set? (MIL to
illuminate) -
correct answer ✅All of the above
, Engine Performance 1 Midterm Exam
Actual Questions and Answers 2026
The EGR valve is used to reduce: -
correct answer ✅Oxides of nitrogen
During cold engine start or acceleration, the air-fuel mixture may
be: -
correct answer ✅Richer than normal
Twenty inches of vacuum would be equivalent to how much
pressure absolute? -
correct answer ✅5 psia
Vacuum is formed on the: -
correct answer ✅Intake stroke
All of the following are responsible for air entering the combustion
chamber except: -
correct answer ✅momentum
Technician A says the relationship of the change of pressure and
altitude is inversely proportional. Technician B says atmospheric
pressure descreases as altitude increases. Who is correct? -
correct answer ✅Both A and B
