Question

A transducer is a device which converts
1. sound signals into electrical ones
2. electrical signals into acoustics ones
3. optical signals into electrical one
4. any one form of signals into another form

Answer 1

Correct Answer - Option 4 : any one form of signals into another form

Explanaton:

• The transducer generates the output in the form of voltage or current, without any external energy source.
• Active transducers are those which do not require any power source for their operation.
• They work on the energy conversion principle.
• They produce an electrical signal proportional to the input (physical quantity).
• Piezoelectric, thermocouple, and photovoltaic cell transducers all are active transducers.
• Microphones, sensors, digital thermometers are examples of transducers. 

'any one form of signals into another form' is the correct option.