Block 2 - 4A - Transducers

Which of these belong to the Electromechanical group

• Variable-Capacitor, Potentiometer, Variable-Inductor

• Crystal Microphone, Permanent Magnet Speaker

• Thermistor, Thermocouple

• Antennas

How do transducers work?

• They convert energy from one form to another by sensing changes in a measurand

• Using PFM to sense and record changes

• Takes advantage of capacitance factors to influence change

• Converts acoustical energy into electrical energy

Which transducer uses the piezoelectric effect?

• Crystal Microphone

• Thermocouple

• Variable-Capacitor

• Photovoltaic

R=L/A refers to which transducer?

• Strain Gauges

• Antenna

• Potentiometer

• Electromagnetic

How does the Permanent Magnet Speaker work?

• Converts electrical signals to sound waves

• Produces voltages when illuminated

• Converts acoustical energy into electrical energy

What does a strain gauge consist of?

• A pattern of resistive foil, mounted on a backing material

• A pressure sensing diaphragm and two coils

• A series of conductors designed to transmit/recieve Radio waves

How many electromagnetic transducers are there?

• 1

• 3

• 4

• 2

How do Crystal microphones work?

• Converts acoustical energy into electrical energy through the piezoelectric effect

• Produces voltage when illuminated

• Uses PFM to produce voltage

Which type of electromechanical transducer uses a diaphragm which moves under pressure to change the AC voltage output on the signal line to the indicator?

• Variable-Capacitor

• Variable-Inductor

• Crystal Microphone

• Thermistor