Electronic Control And Digital Electronics Supplementary NCV Level 3 — Document P2
March 2018 — NCV Level 3 — Electronic Control And Digital Electronics Supplementary
NCV Level 3
2018
NCV Engineering
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Q1— Section header —
1.1A technician uses measuring instru ments for fault finding.
1.1.1State how you would use a digital multimeter to measure current at a specific point in a circuit. (3\
1.1.2An oscilloscope has a waveform displayed as a sine wave. The height from the 0 horizontal line to the posi tive peak shows 2,6 cm and the volt per division is set at 2 V per division. Calculate the amplitude of the waveform.
1.2Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only 'true' or 'false' next to th e question number (1.2.1
1.2.5\ the ANSWER BOOK.
1.2.1An atom with an atomic number of 13 has 8 electrons in its outer most shell.
1.2.2A charged atom is called an ion.
1.2.3Electrons with the same energy levels ex ist in the same energy band.
1.2.4There is mutual sharing of electrons in metallic bonding.
1.2.5
1.3Semiconductor diodes can be modified for different applications. Indicate w hether the following diodes operate in the FORWARD or REVERSE bias. Write only 'F
1.3.4\ the ANSWER BOOK.
1.3.1Light emitting diode
1.3.2Tunnel diode
1.3.3Varacto r diode
1.3.4
1.4Bi polar junction transistors can be configured to act as an electronic switch or as an amplifier.
1.4.1Which configuration of an amplifier has high current and voltage gain? (1\
1.4.2 Draw a ba sic circuit diagram of a common base configuration, indicating the input and output terminals. (3\
1.4.3Write down the full meaning of the following as used on a transistor specification sheet (a\ (b\
1.5Power supplies form part of most electronic applications.
1.5.1Give ONE advantage of using a bridge rectifier circuit rather than a centre tapped transformer circuit. (1\
1.5.2Explain how a capacitor filter is used in a power supply that is trying to overcome pulsating DC voltage. (2\
1.5.3Discuss how a transistor, resistor and zener diode are config ured to form a transistor shunt voltage regulator.
1.6Field effect transistors are sensitive semiconductor components that have advantages over BJTs.
1.6.1List THREE advantages that FETs have over BJTs. (3\
1.6.2
1.7The perational amplifier IC can be used in many applications.
1.7.1Draw and label the circuit symbol of an operational amplifier (5\
1.7.2Which input would be used in the circuit symbol in
Q1— Section header —
Q2— Section header —
2.1Convert the following numbers as indicated
2.1.1159 10 to an octal numbe
2.1.2110101100 to hexadecimal number
2.1.3
2.2
2.3Subtract the following binary numbers: 110,01 11,1 (2\
2.4Multiply the following binary numbers: 1010 101 (2\
2.5Digital counters can be configured to count up or down.
2.5.1De sign a block diagram of a three bit asynchronous binary up counter. (5\
2.5.2dentify THREE characteristics of a synchronous counter. (3\
2.5.3Is the bit element in FIGURE 1 below triggered by a negative or positive edge pulse? FIGURE 1 (1\ [25]25
Q3— Section header —
3.1
3.2A personal computer needs a TV module as an internal expansion card. Explain step by step how you would install this card on the motherboard of an open tower. (4\
3.3Choose an item from COLUMN B that matches the computer port in COLUMN A. Write only the letter (A E\next to the question number (3.3.1
3.3.5\ the ANSWER BOOK. COL UMN A COLUMN B
3.3.5VGA RJ 45 PS/2 Serial IDE
Q4— Section header —
4.1Resistive transducers us e a Wheatstone bridge as a sensing circuit. Study FIGURE 2 below and answer the questions. FIGURE 2
4.1.1Explain the operation of the Wheatstone bridge by including a thermistor as part of the circuit to measure a change in temperature. (5\
4.1.2What other resistive transducer can be attached to this circuit for measurements? (1\
4.2What TWO non electrical values can be measured using nductive transducers? (2\
4.3Describe the operation of a crystal oscillator. 2\ [10]10
Q5— Section header —
5.1List the FIVE basic components that make up the block diagram of a PLC. (5\
5.2An instrumentation technician has to be able to design ladder diagrams to solve problems. Desi gn a ladder diagram to con trol a motor. The motor has two push to
Topics Identified
1
Business Plan
Mark Allocation
Total100 marks
Sections40 + 25 + 15 + 10 + 10 = 100 marks
Paper information
TitleDocument
SubjectElectronic Control And Digital Electronics Supplementary
LevelNCV Level 3
Document typeQuestion paper
Year2018
MonthMarch
Pages7
Downloads3
Examination context
Decade2010s
Years ago8y
SeasonAutumn (SH)
Start dayThursday
Exam periodMarch 2018
Days since exam3,147
About Electronic Control And Digital Electronics Supplementary 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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