Question 333Motor Plants - Assistant Engineer

The correct answer is D) manometer. A manometer is the most common instrument used to measure diesel engine exhaust pressure. Manometers directly measure pressure by using the height of a column of liquid to indicate the pressure value. This makes them well-suited for measuring the relatively low pressures found in diesel engine exhaust systems. The other answer choices are not the most commonly used instruments for this purpose. A pyrometer measures temperature, a bourdon gauge measures pressure using a coiled tube, and a pneumercator is used to measure liquid levels, not pressure.