Question 5
Fig. 4 is a diagram showing reception in a satellite communication system.
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- Name the parts labelled:
(i) P;
(ii) Q.- 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.- What type of electromagnet wave is the signal?
- List three tools required for the installation of Q as shown in Fig. 4.
Observation
The expected answers were:
-
(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.