Nc1020 Electrotechnology Signed Off NCV Level 4 — Memo

November 2024 — NCV Level 4 — Nc1020 Electrotechnology Signed Off

NCV Level 4 2024 NCV Engineering

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Q1— Section header —

1.1.5

1.2The quotient of (A\ is the difference between the synchronous speed and the actual speed of a rotor, to (B\ the synchronous speed, expressed as a ratio, or as a percentage.

1.3I = current V = voltage R = resistance

1.4Small in size Robust Simple in design Light and compact Low maintenance Low cost cheap

1.5.3These motors cannot be used for variable speed jobs as there is no possibility of speed adjustment. It requires an external source for supplying DC excitation. It cannot be started under load, the starting torque being zero

Q2— Section header —

2.1JOG control circuit using a selector switch (10\ F2 OL1 STOP START L2 JOG JOG

2.2.1Two speed motor control (Dahlander control circuit\: The motor used has an additional set of rotor windings with different winding ratio housed in the motor. The control circuit switches between the rotor windings that

2.3Maintained control The circuit goes into operation when the start/stop push button is depressed. The coil of K1 is energi ed over the closed contact

Q3— Section header —

3.1.1This is a s implified representation of a circuit with its main parts, which shows how the electrical installation works and how it is subdivided.

3.1.2This is a d etailed representation of a circuit with its components, which shows how the electrical installation works.

3.1.3

3.2.4(4 (4\

3.3.1MATERIAL REQUIREMENTS: Item Description Quantity Control pendant TOOL REQUIREMENTS: Item Description Quantity

Q4— Section header —

4.1hysical separation should be maintained between sensitive signal wires and electrical power and control conductors. This separation can be accomplished by conduits, wiring trays, or as otherwise recommended by

4.2.1PLC program in ladder logic for the circuit (10\

4.2.2PLC wiring diagram (7\ [20]20

Q5— Section header —

5.1Maintenance should be performed with the system dead and disconnected from all sources of power. If maintenance must be performed while the system is energi ed, safety related practices should be followed.

5.2.1A current exceeding the steady state current for a short period normally described by its peak amplitude and time duration

5.2.2Electromagnetic disturbance that manifests itself in performance degradation, malfunction, or failure of electronic equipment.

5.2.3

5.3Cooling fans Capacitors Control panel 10

5.4.1

5.4.220

Topics Identified

Business Plan

Mark Allocation

Sections20 + 20 + 20 + 20 + 20 = 100 marks

Paper information

TitleMemo

SubjectNc1020 Electrotechnology Signed Off

LevelNCV Level 4

Document typeNCV Engineering

Year2024

MonthNovember

Pages10

Downloads4

Examination context

Decade2020s

Years ago2y

SeasonSpring (SH)

Start dayFriday

Exam periodNovember 2024

Days since exam711

About Nc1020 Electrotechnology Signed Off 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

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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.

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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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