Velocity may be sensed in which ways?

Velocity may be sensed in which ways?

• A. Electrically
• B. Hydraulically
• C. All of the above
• D. Mechanically

Answer: (C)

Velocity can be sensed through electrical, hydraulic, or mechanical means. Electrical sensing turns motion into an electrical signal; meters with rotating elements or ultrasonic transducers produce pulses or signals that grow with flow velocity, giving you a velocity reading electronically. Hydraulic sensing uses the relationship between velocity and pressure in a flowing fluid; by measuring pressure differences across a restriction or using differential-pressure meters, you can deduce velocity from the hydraulic conditions. Mechanical sensing relies on a moving part driven by the flow, such as a paddlewheel or turbine; the rotation rate is directly proportional to the fluid’s velocity. Since velocity information can be captured by all these approaches, “all of the above” is the most complete answer.

Velocity can be sensed through electrical, hydraulic, or mechanical means. Electrical sensing turns motion into an electrical signal; meters with rotating elements or ultrasonic transducers produce pulses or signals that grow with flow velocity, giving you a velocity reading electronically. Hydraulic sensing uses the relationship between velocity and pressure in a flowing fluid; by measuring pressure differences across a restriction or using differential-pressure meters, you can deduce velocity from the hydraulic conditions. Mechanical sensing relies on a moving part driven by the flow, such as a paddlewheel or turbine; the rotation rate is directly proportional to the fluid’s velocity. Since velocity information can be captured by all these approaches, “all of the above” is the most complete answer.