Basic Electronics Paper 2, WASSCE (PC 2ND), 2018

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).