Technician A says that pressure below atmospheric pressure is called vacuum and is measured in inches of Mercury (Hg). Technician B says that a manifold absolute pressure (MAP) sensor uses a low vacuum in the sensor to determine the pressure. Which technician is correct?
A) Technician A only
B) Technician B only
C) Both technicians A and B
D) Neither technician A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because vacuum is indeed pressure below atmospheric pressure and is commonly measured in inches of Mercury (Hg). Technician B's statement is misleading; a MAP sensor measures the absolute pressure in the intake manifold, which can be above or below atmospheric pressure, but it doesn't use a "low vacuum in the sensor" to determine this pressure.

Technician a Says That Pressure Below Atmospheric Pressure Is Called