Manometer: used with a pitot tube to measure static pressure and velocity pressure inside a duct. Which instrument fits this description?

Manometer: used with a pitot tube to measure static pressure and velocity pressure inside a duct. Which instrument fits this description?

• A. Digital Manometer
• B. Manometer
• C. Inclined Manometer
• D. Thermoanemometer

Answer: (B)

Measuring airflow in a duct relies on pressure differences. A pitot tube provides the stagnation (total) pressure, while another port gives the static pressure. The difference between these two pressures is the velocity pressure, which is what you need to determine how fast the air is moving. A manometer uses a liquid column to show pressure differences clearly; when you connect one side to the pitot tube (total pressure) and the other side to the static port, the height difference in the liquid represents the velocity pressure. From that reading, you can calculate air velocity using the fluid’s density. A thermoanemometer, by contrast, reads velocity and temperature directly rather than measuring a pressure difference with a liquid column. Digital variants exist, but the fundamental instrument described for comparing pitot and static pressures in a duct is the manometer.

Measuring airflow in a duct relies on pressure differences. A pitot tube provides the stagnation (total) pressure, while another port gives the static pressure. The difference between these two pressures is the velocity pressure, which is what you need to determine how fast the air is moving. A manometer uses a liquid column to show pressure differences clearly; when you connect one side to the pitot tube (total pressure) and the other side to the static port, the height difference in the liquid represents the velocity pressure. From that reading, you can calculate air velocity using the fluid’s density. A thermoanemometer, by contrast, reads velocity and temperature directly rather than measuring a pressure difference with a liquid column. Digital variants exist, but the fundamental instrument described for comparing pitot and static pressures in a duct is the manometer.