Fault Finding and Protective Devices N4 November Past Papers and Memos

1. Q1 1.1 Why was the nine-point plan designed? (2) 14 marks
2. Q2 2.1 Draw a three-phase star/delta automatic control circuit. (8) 24 marks
3. Q4 4.1 Explain forced commutation of SCRs. (2) 8 marks
4. Q6 6.1 Draw the symbol of an AND gate with TWO inputs. (2) 13 marks

Instructions to candidates

1. Answer all the questions.
2. Read all the questions carefully.
3. Number the answers according to the numbering system used in this question paper.
4. Use only a blue or black pen.
5. All drawings and graphs should be clear and neat and may be done in pencil.
6. Write neatly and legibly. (8080104) -3-