Radio,Television And Electronic Paper 2, WASSCE (SC), 2023

Question 5

 

  1. Fig 2 is the diagram of a series RLC circuit

(i) state one condition for the circuit in Fig. 2 to be at resonance.

(ii) If the circuit is at resonanmce, show that

(i)

(ii) 

Fig 3. Is the block diagram of a simple audio system

  1. Identify the parts labelled w,x and y
  2. State the energy conversion effected by each of w and y
  3. State the function of x in the operation of the system
  4. Name one electronic communication system that employs the model in fig 3

 

Observation

  The expected responses were

                                    (b)    

W – microphone
X – amplifier/ audio amplifier
Y – Speaker / Loud speaker

(i)

Energy conversion effected by
W – sound energy to electrical energy
Y - electrical energy to sound energy
  (ii)                                                                                                                                 

Function of X in the operation of the system

It amplifies/ boosts the amplitude of electrical signal

(iii)

Public address system, Radio receiver, TV receiver

 

The chief examiner reported that question 5 was unpopular among candidates as only a few of them attempted it and did well in the question.