Industrial Electronics N6 — Document
November 2022 — N6 — Industrial Electronics
N6
2022
Nated Engineering
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Q1— Section header —
1.1
1.1.1The capacitor voltage rises to V (4\
1.1.2The voltage across the resistor drops to 0 V. (2\
1.1.3The charging current is reduce to 0 A. (2\
1.2Give the names of each of the following:
1.2.1The mathematical laws that govern the analysis of transient RLC circuits
1.2.2The electronics laws on which the equations of transient RLC circuits are based (2 1\ (2\
Q2— Section header —
2.1The concept of unity gain in an operational amplifier denotes a relation between two resistors. Name these TWO resistors and identify the relation between them.
2.2Indicate whether the following statements are TRUE or FALSE by writing only 'True' or 'False' next to the question number (2.2.1
2.2.5\in the ANSWER BOOK.
2.2.1In an amplifier multiplier circuit that is connected in the non inverting mode, the R /R combination is connected to the inverting input of the
2.2.2In an amplifier multiplier circuit that is connected in the inverting mode, the R /R combination is connected to the non inverting input of the
2.2.3When an op amp is used during offsetting, the linear voltage divider network is connected to the non inverting input. (1\
2.2.4When an op amp is used for voltage to
2.2.5When an op amp is used for current to voltage interfacing, the R
2.3voltage to current interface amplifier has an input resistor of 20 dropping resistor of
Q3— Section header —
3.1Indicate whether the following statements are TRUE or FALSE by writing only 'True' or 'False' next to the question number (3.1.1
3.1.5\in the ANSWER BOOK.
3.1.1Ultrasonic refers to sound energy at frequencies below the audible range of sound which has a limit of 20 KHz.
3.1.2The direct piezo electric effect only refers to non conductive materials.
3.1.3Magnetostriction only refers to non conductive materials.
3.1.4Cavitation takes place when ultrasonic energy is generated in a gas.
3.1.5The converse piezo electric effect only refers to conductive materials. (5 1\ (5\
3.2Various options are given as possible answers to the following questions. Choose the answer and write only the letter (A D\ next to the question number in (3.2.1
3.2.4\n the ANSWER BOOK.
3.2.1The propagation properties of ultrasonic energy through liquids are excellent. good.
3.2.2The propagation properties of ultrasonic energy through gasses are excellent. good. non
3.2.3The propagation properties of ultrasonic energy through a vacuum are excellent. poor.
3.2.4The propagation properties of ultrasonic energy through solids are excellent. good. non
3.3Name THREE main physical apparatus es that are required to effect ultrasonic cleaning. (3\ [12]12
Q4— Section header —
4.1The following data on an X ray machine is available: Supply voltage = 90 KV Atomic number = 42 Cathode emission = 1 10 17
4.2Choose the correct term from those in brackets. Write only the answer next to the question number (4.2.1
4.2.5\n the ANSWER BOOK.
4.2.1Electromagnetic waves travel at the speed of light in (air/a vacuum\
4.2.2(Hard X rays/Soft X rays\ have longer wavelengths.
4.2.3(Soft X rays/Hard X rays\ave shorter wavelengths.
4.2.4Absorption of X radiation by any substance is dependent on the atomic (weight/mass\f the substance.
4.2.5rays are produced by transitions of (inner/outer\ electrons that orbit atoms. (5 1\ (5\
4.3Draw and fully label a neat circuit diagram of the Geiger ller counter. (6\ [14] 808018614
Q5— Section header —
5.1Give ONE term for each of the following descriptions by writing it next to the question number (5.1.1
5.1.5in the ANSWER BOOK.
5.1.1An instrument that is used to determine the thickness or variation thereof of a material.
5.1.2A deflection system that is based on the reflection of sound waves in a medium.
5.1.3A deflection system that is based on the reflection of radio waves in the air.
5.1.4An ultrasonic thickness gauging method that is suited for straight beam castings.
5.1.5
5.2Name, in any order, FIVE main elements of the block diagram of a basic metal detector unit. (5\ [10]10
Q6— Section header —
6.1Various options are given as possible answers to the following questions. Choose the answer and write only the letter (A D\ next to the question number in (6.1.1
6.1.4\n the ANSWER BOOK.
6.1.1Which statement describes open loop process control? Senses the output Compares the output
6.1.2Which statement describes closed loop process control Does not employ feedback
6.1.3Which of the following systems does not form part of follow up closed loop control
6.1.4Which of the following does not form part of the development phases of a CAD system: Prototype Design concept
6.2Draw a neat, labelled block diagram of the forward system, which is a type of a continuous industrial UPS. (7\ [11]11
Q7— Section header —
7.1Consider the construction of a basic photoelectric smoke detector circuit and answer the following questions:
7.1.1Give any ONE example of a light sensitive transducer that can be used in the construction of a smoke detector circuit. (2\
7.1.2Give FOUR examples of circuit components that can be used in the construction of a smoke detector circuit to serve as mediums for transmitting a light beam. (4\
7.2An optical relay consists of a transmitter and two other components. Name these other TWO components. (2\
7.3List THREE types of protective elements/circuits that can be used to ensure intrinsic safety. (3\ [11] 808018611
Q8— Section header —
8.1Refer to FIGURE 1 below and the accompanying DATA and answer the following questions: FIGURE 1 DATA: SCR volt drop = 1 5 V each = 90
8.1.1Give the full name of the circuit in FIGURE 1 above. (1\
8.1.2Name the phase connection in FIGURE 1 above. (1\
8.1.3Calculate the mean load voltage. (6\
8.1.4Calculate a suitable PIV rating for the thyristors. (4\
8.2Name TWO types of AC drives. (2\ [14]14
Q9— Section header —
Topics Identified
2
Forms of OwnershipBusiness Plan
Mark Allocation
Total100 marks
Sections10 + 13 + 12 + 14 + 10 + 11 + 11 + 14 + 5 = 100 marks
Paper information
TitleDocument
SubjectIndustrial Electronics
LevelN6
Document typeQuestion paper
Year2022
MonthNovember
Pages13
Downloads9
Examination context
Decade2020s
Years ago4y
SeasonSpring (SH)
Start dayTuesday
Exam periodNovember 2022
Days since exam1,438
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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