Control Systems N6 — Memo

April 2021 — N6 — Control Systems

N6 2021 Nated Engineering

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Questions — A Preview of What to Expect in the Document

This section provides a quick preview of questions from the document. It may not display every question or the complete wording of each one. For the full content, including diagrams, tables and other information, view the original PDF above.

Q1— Section header —

1.1False

1.2True

1.3False

1.4False

1.5True

1.6False

1.7True

1.8False

1.9True

1.1010

Q2— Section header —

2.1(6\ H1 H2 G1 + G2 H1H2

2.2.1sin2 (1\

2.2.2Output Input +2 Output +2 Output +2

Q3— Section header —

3.143 dB (1\

3.2(1\

3.30,6 rad/s (1\

3.443 dB/decade or 14 dB/octave (1\

3.58 rad/s (1\

3.64,5 rad/s (1\

3.7(1\

3.8(1\

3.9The gain and phase margins are negative, thus indicating an unstable system. (2\ [10]10

Q4— Section header —

4.1(5\

4.2Magnitude in dB Phase in degrees [10]10

Q5— Section header —

5.1

5.3+1 +1 K=0 ,1,2,3, when =0 when

Q6— Section header —

6.1Subtracting Multiplying Dividing Differentiating The wheel is positioned so that a light beam passes through one of the holes to reach the photocell. An AC amplifier selects and transmits the required frequency signal to produce an output.

Q7— Section header —

7.1Large DC servos Small AC servos Produces eddy currents due to back emf [10]10

Q8— Section header —

8.1.1A: Thyristor/SCR B: Bridge rectifier C: Armature (3\

8.1.2The armature speed is controlled by the rate at which the thyristor is triggered. For every half wave cycle of the bridge rectifier, the field coil produces a magnetic flux. The thyristor becomes forward biased on every alternate half cycle when triggered by the

Q9— Section header —

9.1Integral controller [10]10

Q10— Section header —

10.1Lissajous figures are usually used for determining the frequency of unknown sinusoidal signals. (2\

10.2Impedance mismatching (1\

10.3Mismatching results in reflections that are re reflected to the load. (2\

10.4Frequency response test (1\

10.5A saw tooth wave can be generated by charging and discharging a capacitor using proper RC ti me constants. (2\

10.610

Mark Allocation

Sections10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 = 100 marks

Paper information

TitleMemo

SubjectControl Systems

LevelN6

Document typeNated Engineering

Year2021

MonthApril

Pages8

Downloads4

Examination context

Decade2020s

Years ago5y

SeasonAutumn (SH)

Start dayThursday

Exam periodApril 2021

Days since exam2,017

About Control Systems examination preparation

This TVET examination resource can be used as part of a structured revision programme. Past papers are most useful when learners attempt questions independently, work within a realistic time limit, and review their answers afterwards.

How to use this resource for revision

A TVET past examination paper is most useful when it is treated as an active revision exercise. Try the questions yourself before checking the corresponding memorandum. Where you make an error, identify the reason — was it a knowledge gap, a calculation mistake, an interpretation issue, or an examination technique problem?

For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

understanding question requirements

applying subject knowledge

working under time constraints

checking answers

identifying revision priorities

A practical revision approach

Start by completing the resource without looking at the memorandum. Review incorrect and incomplete answers afterwards and make a short revision list based on the areas that caused difficulty.

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File size370.4 KB

Pages8

Archived on8 September 2026

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