The expected answers were:
(a) A transducer is a device that converts energy from one form to another.
(b)(i) Control systems that use transducers include:
- Speed control system
- Position control system.
- Pneumatic control system.
(ii) - Speed control – a tachometer converts speed to voltage that is then
compared with set reference to provide control signal.
- Position control: a potentiometer converts position to voltage, which is then compared with set reference to provide desired control signal.
- Pneumatic control: pneumatic valve springs convert pressure to voltage for comparison with a set reference to obtain the desired control signal.
(c) Types of transducer
- Piezo-electric crystals
This question was on control circuit. The question was popular. Candidates that attempted this question answered every part well.