Electronic Control And Digital Electronics NCV Level 3 — Document
November 2023 — NCV Level 3 — Electronic Control And Digital Electronics
NCV Level 3
2023
NCV Engineering
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Q1— Section header —
1.1Measuring nstruments: Use FIGURE 1 (below\ of an oscilloscope screen to calculate the following values: FIGURE 1
1.1.1The mplitude of the sine wave (3\
1.1.2The eriod of the sine wave (3\
1.1.3The frequency of the sine wave (2\
1.2Atomic heory:
1.2.1Explain why the element silicon or germanium is used to create semiconductor material. (2\
1.2.2What type of bonding occurs to form the crystal lattice structure of semiconductor material? (1\
1.2.3Explain why semiconductor material remains neutral even after doping. (2\
1.3Semiconductor iodes
1.3.1Compare how heat affects the reverse currents of a typical PN junction diode. (2\
1.3.2List TWO uses of LCD units. (2\
1.3.3How many segments of a seven segment LCD display will be used to create the number 2? (1\ Volt/Div = 2
1.4ipolar junction transistors Selecting the correct transistor is important. Decide from the atasheet table FIGURE 2
1.4.1Why would you select a BC141 instead of a BC107 to switch a 500 mA circuit on and off?
1.4.2Why would you select a BC109 instead of a BC160 for a low power consumption circuit?
1.4.3Why would you select a BC161 instead of a BC141 to handle negative going voltages and currents?
1.4.4Which transistor would you select to build a high gain ommon emitter amplifier circuit a BC108 or a BC140?
1.4.5
1.5Power supplies Indicate whether the following statements are TRUE or FALSE by writing only 'True' or 'False' next to the question number (1.5.1 1.
5.5\in the ANSWER BOOK.
1.5.1Bridge rectifier circuits make use of two diodes.
1.5.2Non filtered power supplies produce pulsating DC.
1.5.3A half wave rectifier circuit is more efficient than a full wave circuit. 12041023
1.5.4LC filter components remove ripple from the output DC supply.
1.5.5
1.6Field ffect ransistors (FET\
1.6.1Describe the construction of a channel JFET. (3\
1.6.2The P channel allows hole flow through the channel. Explain how the epletion type
1.7Operational amplifiers Complete the following sentence by writing only the missing word or words next to the question number (1.7.1
1.7.5\n the ANSWER BOOK.
1.7.1amp circuit is 180 out of phase to its input.
1.7.2amp circuit does not have any gain.
1.7.3Integrator
1.7.5
1.8Op mp ICs can be configured as a differentiator circuit. What is the use or application of this circuit? (1\ [40]40
Q2— Section header —
2.1Number systems onversions
2.1.1Convert 36 to inary
2.1.2Convert 11000110 to exadecimal
2.1.3
2.2Binary arithmetic
2.2.1Add 1011 + 1111 + 1001 (4\
2.2.2
2.2.3
2.3Binary counters
2.3.1Describe the operation of a synchronous four bit binary upcounter. (4\
2.3.2What will be the final binary count of a ecade counter before it resets? (1\ [25]25
Q3— Section header —
3.1What are the FOUR main components or hardware of any personal computer? (4\
3.2How does the tower indicate to the user that there are faults with attached components or peripherals? (2\
3.3Explain what the term POST means in terms of a computer start up process and how it affects the proper start up process. (3\
3.4Identify the following internal components of a comp uter and indicate their use in a p ersonal computer
3.4.212041023 Copyright reserved Please turn over
3.4.3(3 2\ (6\ [15]15
Q4— Section header —
4.1What transducer devices or components can be used to measure the following?
4.1.1Pressure
4.1.2Movement
4.1.3Velocity or peed
4.1.4
4.2Describe how you would use a train gauge connected to a Wheatstone bridge to measure force applied to it. (4\
4.3hat is the purpose of an electrical transducer (2\ [10]10
Q5— Section header —
5.1Choose a term from COLUMN B that matches a description in COLUMN A. Write only the letter (A F\ next to the question number (5.1.1
5.1.5\in the ANSWER BOOK. COLUMN A COLUMN B
5.1.5Allows programs to be read off a PLC Used as an input device Contacts are in series Controls the operation of a PLC Stores operation instructions of a PLC
5.2Design a labelled ladder diagram to solve the following problem A heating element can be switched on only if a sensor detects a metal pot above it. The element continues to heat until the operator switches it off.
Mark Allocation
Total100 marks
Sections40 + 25 + 15 + 10 + 10 = 100 marks
Paper information
TitleDocument
SubjectElectronic Control And Digital Electronics
LevelNCV Level 3
Document typeQuestion paper
Year2023
MonthNovember
Pages8
Downloads12
Examination context
Decade2020s
Years ago3y
SeasonSpring (SH)
Start dayWednesday
Exam periodNovember 2023
Days since exam1,073
About Electronic Control And Digital Electronics 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.
understanding question requirements
applying subject knowledge
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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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