Which of the following transducers is used for transmitting as well as receiving acoustic energy in an ultrasonic flow meter ?
Piezoelectric crystals
An ultrasonic flow meter (transit-time or Doppler type) sends ultrasonic pulses through the fluid and detects them after they travel with or against the flow, or after they are reflected by particles.
Piezoelectric crystals (quartz, PZT ceramics) are reversible transducers: an applied alternating voltage makes them vibrate and emit ultrasound (converse piezoelectric effect), and an arriving pressure wave produces a voltage across them (direct piezoelectric effect). The same crystal can therefore act as both transmitter and receiver.
An LVDT measures linear displacement, while an RTD and a thermistor are temperature sensors; none of these can generate or detect acoustic energy.
Hence, the answer is Piezoelectric crystals.
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Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
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List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
