cameroon gce intermediate level 2025 electrical technology and diagram 2
cameroon gce intermediate level 2025 electrical technology and diagram 2
SECTION A: ELECTRICAL TECHNOLOGY
1.
- a) Give one advantage and one disadvantage of a switch start fluorescent lamp and an instant start fluorescent lamp. (6 marks)
- b) Draw and label all the parts of an instant start fluorescent lamp circuit. (7 marks)
- c) Identify and give the function of the main part in an instant start fluorescent lamp circuit. (5 marks)
- d) Why is it that when you remove the starter from a fluorescent lamp which is ON, the lamp doesn’t go off? (5 marks)
- e) When a starter is connected in series with an incandescent lamp, how does the lamp behave when switched ON? (3 marks)
- f) Give one advantage and one disadvantage of connecting lamps in series and in parallel. (4 marks)
2. a) In electrical engineering, what do you understand by:
- i) Generation. (4 marks)
- ii) Transmission. (4 marks)
- iii) Distribution. (4 marks)
- iv) Define interconnection and state two reasons for interconnection. (7 marks)
- b) i) In overhead high voltage transmission lines, bare conductors are often used instead of insulated conductors. Why? (4 marks)
- ii) Outline two advantages of this bare conductor. (3 marks)
- iii) Outline two advantages of copper conductor over aluminium conductor. (4 marks)
3. A 230V-50Hz domestic installation, has the following electrical appliances:
- 14 lamps of 40W-230V each;
- 11 sockets 2P+E 16A-230V each;
- 08 sockets 2P, 16A-230V each;
- 02 electric irons: 1200W-230V and 1800W-230V;
- 01 electric cooker 3200W-230V;
- 01 laundry machine 825W-230V;
- 01 dishing machine of 230V, one horse power (736W);
- 02 air conditioners of 230V, with a power of 1.25 horse power each.
