Engine Performance Final Review
Exam Questions & Answers (Grade
A+)
As the load on an engine increases, manifold vacuum decreases and
the manifold absolute pressure ________. -
correct answer ✅Increases
A typical MAP compares the vacuum in the intake manifold to
________. -
correct answer ✅A perfect vacuum
Which statement is FALSE? -
correct answer ✅Absolute pressure is equal to barometric
pressure plus intake manifold vacuum
Which design of MAP sensor produces a frequency (digital) output
signal? -
correct answer ✅Capacitor-capsule
The frequency output of a digital MAP sensor is reading 114 Hz.
What is the approximate engine vacuum? -
correct answer ✅15 in. Hg
, Engine Performance Final Review
Exam Questions & Answers (Grade
A+)
Which of these is NOT a purpose or function of the MAP sensor? -
correct answer ✅Measures engine speed
When measuring the output signal of a MAP sensor on a General
Motors vehicle, the digital multimeter should be set to read
________. -
correct answer ✅DC volts
Two technicians are discussing testing MAP sensors. Technician A
says that the MAP sensor voltage on a General Motors vehicle at
idle should be about 1.0 volt. Technician B says that the MAP sensor
frequency on a Ford vehicle at idle should be about 105—108 Hz.
Which technician is correct? -
correct answer ✅Both technicians A and B
Technician A says that MAP sensors use a 5-volt reference voltage
from the PCM. Technician B says that the MAP sensor voltage will
be higher at idle at high altitudes compared to when the engine is
operating at near sea level. Who is right? -
correct answer ✅Both technicians A and B
Exam Questions & Answers (Grade
A+)
As the load on an engine increases, manifold vacuum decreases and
the manifold absolute pressure ________. -
correct answer ✅Increases
A typical MAP compares the vacuum in the intake manifold to
________. -
correct answer ✅A perfect vacuum
Which statement is FALSE? -
correct answer ✅Absolute pressure is equal to barometric
pressure plus intake manifold vacuum
Which design of MAP sensor produces a frequency (digital) output
signal? -
correct answer ✅Capacitor-capsule
The frequency output of a digital MAP sensor is reading 114 Hz.
What is the approximate engine vacuum? -
correct answer ✅15 in. Hg
, Engine Performance Final Review
Exam Questions & Answers (Grade
A+)
Which of these is NOT a purpose or function of the MAP sensor? -
correct answer ✅Measures engine speed
When measuring the output signal of a MAP sensor on a General
Motors vehicle, the digital multimeter should be set to read
________. -
correct answer ✅DC volts
Two technicians are discussing testing MAP sensors. Technician A
says that the MAP sensor voltage on a General Motors vehicle at
idle should be about 1.0 volt. Technician B says that the MAP sensor
frequency on a Ford vehicle at idle should be about 105—108 Hz.
Which technician is correct? -
correct answer ✅Both technicians A and B
Technician A says that MAP sensors use a 5-volt reference voltage
from the PCM. Technician B says that the MAP sensor voltage will
be higher at idle at high altitudes compared to when the engine is
operating at near sea level. Who is right? -
correct answer ✅Both technicians A and B
