Industrial Electronics N3 — Document
August 2021 — N3 — Industrial Electronics
N3
2021
Nated Engineering
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Q1— Section header —
1.5\in the ANSWER BOOK.
1.1A circuit that provides an entirely positive or negative output voltage when an AC half wave rectifier.
1.2Which of the following is a dis advantage of using a bridge rectifier rather than a two diode full
1.3What diodes are doped with elements such as gallium, arsenic, and phosphorus and emit different colours of light? LEDs
1.4What diode is optimi ed for operation in the breakdown region and is often used as a voltage regulator? Silicon rectifier
1.5
Q2— Section header —
2.5\n the ANSWER BOOK.
2.1A semiconductor is a material that is neither a good conductor nor a good insulator.
2.2The semiconductor element carbon is mainly used in the production of diodes.
2.3FETs may be used as both analogue and logical switches.
2.4Electrostatic fields are used to position the electron beam of an oscilloscope.
2.55
Q3— Section header —
3.5\n the ANSWER BOOK. COLUMN A COLUMN B
3.5pecially fabricated diode with proper impurity concentration profile and operated under reverse biased to give a variable junction capacitance.
Q4— Section header —
4.5\n the ANSWER BOOK. free electrons; three; negativ e; N type; common emitter; holes; zero; f our; common base; P type
4.1For current to flow through a diode, the positive terminal of the power supply
4.2The most commonly used transistor arrangement is
4.4A semiconductor has
4.55
Q5— Section header —
5.1Determine the equation for oop 1 (ABDFGH\ (2\
5.2Determine the equation for oop 1 (ABCEGH\ (2\
5.3Determine the unknown currents and (I
Q6— Section header —
6.1Calculate the current flowing through the inductor. (4\
6.2Calculate the current flowing through the capacitor. (4\
6.3Calculate the current flowing through the resistor. (2\
6.4Calculate the total current. (3\
6.5Calculate the phase angle. (2\ [15]15
Q7— Section header —
7.1Oscilloscopes and televisions require high voltages for the cathode ray tubes to operate. These type of voltages are generated by voltage multipliers. Draw a neat labelled circuit diagram of a half wave voltage doubler.
7.2Optocouplers are sometimes used as optic switches. Draw a neat labelled circuit diagram of optocouplers used as switch es (2\ [5] (8080613\5
Q8— Section header —
8.1When transistor is used as an amplifier , it can be connected in three basic amplifier configurations. Name FOUR characteristics of a common
8.2FIGURE below shows a common emitter amplifier. Refer to FIGURE 3 and ans wer the questions that follow
8.2.1Calculate the collector current ( (2\
8.2.2Use the characteristic curve on the ANSWER SHEET (attached to draw the load line for the amplifier. (2\
8.2.3Indicate a suitable Q point on the DC load line for the amplifier to act as a Class
8.3Negative feedback is used to improve the performance of an amplifier. Name FOUR of these improvements.
8.4MOSFETs differ from JFETs in the way in which the gate terminal is insulated from the channel. Answer the questions below regarding MOSFETs
8.4.1Draw the IEC symbol for a channel depletion MOSFET.
8.4.2Draw the IEC symbol for a P channel enhancement MOSFET. (2 2\ (4\ [1
Q9— Section header —
9.1A frequency counter measures an unknown frequency by counting the number of cycles of the unknown signal. Draw a neat labelled block diagram of frequency counter.
9.2Voltmeters can measure unknown voltages by using different methods. Describe the operation of the continuous balance. (5\ [9]9
Q10— Section header —
10.1Name THREE areas where the potentiometer can be used as a transducer. (3\
10.2Describe the operating principle of the linear variable differential transformer (LVDT\ (2\
10.3Draw the IEC symbol for a negative temperature coefficient thermistor. (1\
10.4Name TWO areas of application of a photo voltaic cell. (2\ [8]8
Q11— Section header —
11.1Draw a neat labelled circuit diagram of the inverting operational amplifier. (2\
11.2Draw the output wave form of the integrator if the input is a sine wave. (2\
11.3Draw a neat labelled circuit diagram of the non inverting operational amplifier. (2\ [6]6
Q12— Section header —
12.1In full wave control the load current flows in both half cycles. Draw a neat labelled sketch of a back to back full wave control circuit. (3\
12.2Phase control is achieved by controlling the time at which the SCR is switched on. Draw a neat labelled output wave form to illustrate phase control (2\
12.3Describe the difference between line commutation and forced commutation (2\
12.4Name ONE method to suppress transients. (1\ TOTAL SECTION B: 80 GRAND TOTAL: 100
Topics Identified
2
Business FunctionsBusiness Plan
Mark Allocation
Total100 marks
Sections5 + 5 + 5 + 5 + 12 + 15 + 5 + 9 + 8 + 6 = 75 marks
Paper information
TitleDocument
SubjectIndustrial Electronics
LevelN3
Document typeQuestion paper
Year2021
MonthAugust
Pages10
Downloads4
Examination context
Decade2020s
Years ago5y
SeasonWinter (SH)
Start daySunday
Exam periodAugust 2021
Days since exam1,896
About Industrial Electronics examination preparation
Industrial Electronics covers semiconductor devices, amplifiers, power supplies, and digital logic circuits. The examination tests both theoretical knowledge and practical circuit analysis.
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.
semiconductor theory
circuit analysis
component identification
digital logic principles
interpreting circuit diagrams
A practical revision approach
Practice circuit analysis with correct formulae and units. The memorandum rewards accurate calculations, correct component identification, and proper interpretation of circuit diagrams.
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