Radio,Television And Electronic Paper 2, WASSCE (SC), 2018

Question 5

 

Fig. 4 is a diagram showing reception in a satellite communication system.


  1.  

    1. Name the parts labelled:

    (i)         P;
    (ii)        Q.

    1. State:

    (i)         two types of satellite communication systems;
    (ii)        one reason for the shape of Q;
    (iii)       two factors that may cause poor quality of output of the television.

    1. What type of electromagnet wave is the signal?
    2. List three tools required for the installation of Q as shown in Fig. 4.

Observation

  The expected answers were:

 

  1. (a) (i) P – Low Noise Block(LNB)/ Low Noise Amplifier(LNA)/
    Low Noise Receiver(LNR)/Horn antenna                         
    (ii) Q – antenna/dish                                                                     
    (b) (i) Types of satellite communication systems

    • Tracking satellite
    • Geostationary satellite
    • Low Earth Orbit (LEO) satellite

        (ii) To converge all rays (signals)/bring all rays (signals) to focus.                      
    (iii) Factors that may cause poor quality of output of the television

    • Poor installation
    • Weather condition
    • Poor line of sight
    • Loose connection
    • Damaged part/component
    • Shift in position of dish/antenna/LNB
    • Faulty LNB
    • Damaged dish
    • Faulty R.F. cable
    • Faulty decoder
    • Interfering signal                                                                                     

    (c)        Microwave/radio wave                                                                      
    (d)       Tools required for the installation of Q

    • Screw driver
    • Stripper
    • Spanner
    • Hammer
    • Pair of pliers
    • Drilling machine
    • Plumb line
    • Ladder
    • Crash/safety helmet
    • Safety belt

    The reported stated that majority of the candidates who attempted Question 5 performed fairly.