Answer / guezz who

is the change in frequency of a wave (or other periodic
event) for an observer moving relative to its source. It is
commonly heard when a vehicle sounding a siren or horn
approaches, passes, and recedes from an observer. The
received frequency is higher (compared to the emitted
frequency) during the approach, it is identical at the
instant of passing by, and it is lower during the recession.

We can applied this to Sirens, astronomy, temperature
measurement, flow measurement, vibration measurement,
radar, velocity measurement, audio, underwater acoustics,
and medical imaging.

How to check vortex flow meter is in good condition while we do not having calibration setup?

4 Answers  

---

What is the principle of a Pressure gauge?

2 Answers   CCIE,

---

i have used level transmitter in starch cooking preparation tank. tank total height 2mtr.sometime LT display shows some error value when tank is fully empty and diaphragm side i already checked okay no problem in diaphragm area. field cable checked 24volt and mA shows correct value while tank empty mA is 4mA. 4mA i needed that 0% but display showing 10% or 15% percentage values are varying continously please give any good solution for me.....

0 Answers  

---

In turbine, what does term CDP, NI, NH, HSSOC, means

0 Answers   ADMA OPCO,

---

what is the calibration procedure for transweigh make weigh feeder?

0 Answers   Anjani Cements,

---

---

what are procedure of sox-nox calibration

0 Answers   TATA,

---

Square root calculation for dp flow transmitter?

0 Answers  

---

What is the Difference between CNC and PLC

1 Answers  

---

what is dry leg and wet leg in transmeter calibration?

3 Answers  

---

whats diffeence between dcs & scada operation.

3 Answers   Orchid, Reliance,

---

In control valve , Failure position : Close If it is Fail close(FC) during failure of AIR.. what will be the initial/ normal position of control valve is it normally open or close? please some one explain soon..

2 Answers  

---

draw the characteristics of chebyshev filter

0 Answers  

---