Electrotechnics N6 December Past Papers and Memos

1. Q1 1.1 A DC series motor is a variable speed motor. 16 marks
2. Q2 An alternating voltage represented by the expression: 16 marks
3. Q3 3.1 State TWO constant losses occurring in a transformer and state precisely 14 marks
4. Q4 4.1 Explain what is meant by distribution factor of a synchronous alternator. (3) 15 marks
5. Q5 A 525 V, 6 pole, 50 Hz, three-phase, delta-connected induction motor develops 28 kW 13 marks
6. Q6 A large industrial consumer takes 1 MVA at a power factor of 0,75 lagging. To reduce 13 marks
7. Q7 A new development is to be supplied by an existing overhead transmission line. The line 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. Round off all calculations to THREE decimals.
5. Sketches must be large, neat and fully labelled.
6. Use the correct symbols and units.
7. Use only a black or blue pen.
8. Write neatly and legibly. (8080096) -3-