Question 6
(a) State two:
(i) methods of communication;
(ii) types of sensors
(b) Fig. 4 is a block diagram of a tuned frequency receiver.
State the:
(i) transducers at blocks marked X and Z;
(ii) name of the block marked Y.
The expected answers were:
(a) (i) Methods of communication
- Wireless communication
- Wired communication
- Satellite communication
- Telephony
- FAX
- Drum
- Speech/voice
- Smoke
- Picture
- Data
(ii) Types of sensors
- Temperature sensor
- Acoustic/sound sensor
- Proximity sensor
- Capacitive sensor
- Pressure sensor
- Smoke sensor
- Light sensor
(b) X – antenna
Y – detector
Z – speaker
It was reported that candidates responded very well to question 6 but a few were unable to identify superheterodyne blocks in part (b).