Question

Air velocity in ducts can be measured by using pilot tube and______ a)manometer b)orifice meter c)bourdon guage d)anemometer

Answer 1

The answer is a.) Manometer.

Answer 2

Air velocity in ducts can be measured by using pilot tube and (a) manometer.

Explanation:  

Manometers:

• Manometers are the instruments that are used to compare or measure pressures.
• The simplest form of the manometer with fluid-filled like a U-tube shape is shown in the below figure.
• In the below figure, $P_{1}$ and $P_{2}$ are the pressures of interest.
• An inert gas is sent to both ends of the liquid column - its density is very low compared to the liquid density.
• The pressure $P$ and the differences in height $h$ are measured.

This is the consequence of,

⇒ $P_{1}- P_{2} =pgh$

Compatibility of manometers:

• As the fluid, liquid and gas can be measured by manometers.

• Solid objects cannot be measured by manometers.