It is fault finding only, Summaries of Law

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REPORT 191 PROGRAMMES

SYLLABUS

FAULT FINDING AND PROTECTIVE DEVICES

N

SUBJECT CODE: 8080104

Implementation: May 202 4

CONTENTS PAGE

1. 3 2. Error! Bookmark not defined. 3. Pre-requisite 3 4. 3 5. 3 6. 4 7. 4 Module 1: Heavy Current ……………………………………………………………………………… 5 1.1 Basic philosophy , Fault Finding Techniques 1.2 Symbol and Circuits 1.3 Measuring Instruments 1.4 Motor Protection Module 2: LIGHT CURRENT …………………………………………………………………………… 7 2.1 The Cathode Ray Oscilloscope 2.2 Resistors , Capacitors and Inductors (RLC) 2.3 Types of Diodes 2.4 Transistors Module 3: BINARY LOGIC AND BOOLEAN ALGEBRA ………………………………………….. 8 3.1 Introduction 3.2 The logic “OR” decision 3.3 The logic “AND” decision 3.4 The inverter (NOT Gate) 3.5 The “NOR” gate 3.6 The “NAND” gate 3.7 The developing gating Network from written expressions 3.8 The Exclusive “OR” gate 3.9 De Morgan’s Theorem 3.10 Use of De Morgan’s Theorem rto convert from “NAND/OR” to “NAND” form 3.11 Laws and identities of Boolean Algebra 3.12 Using Boolean Algebra 3.13 “WIRED” AND and “WIRED” OR gates 3.14 Practical Application of some of the components 3.15 Colour codes for resistors and capacitors

The promotion mark will be calculated as follows: Promotion Mark = 40% of (ICASS mark) + 60% of (Exam mark) 5.2 The examination in Fault Finding and Protective Devices N4 (Engineering Studies - Report 191) will be conducted as follows: Modules 1 to 3 MARKS: 100 DURATION: 3 HOURS CLOSED BOOK: Formula sheet is attached to the question paper. Scientific calculators NOT allowed. No programmable calculators allowed. No references allowed. No external examination papers or memoranda allowed. 5.3 Weighting : The following weights are consequently awarded to each category: Knowledge and Understanding Applying Analysing / Syntheses and Evaluating 35 – 40 30 – 40 20 – 25

6. Learning content

THEORETICAL BACKGROUND

It is essential that this subject should be illustrated and evaluated within the context of practical case studies. TECHNICAL BACKGROUND It is essential that this subject should be illustrated and evaluated within the context of technical skills and simulation of practical environment.

7. Mark allocation in the examination as an indication of the

weighting of the different modules

MODULES WEIGHTING

1. Heavy Current 40
2. Light Current 40
3. Binary Logic and Boolean Algebra 20 TOTAL 100

Module 1: Heavy Current

General aim

On completion of this module, the student should be able to explain the theoretical and practical application of the following concepts: electrical circuits, electromagnetism, and magnetic circuits. LEARNING CONTENT LEARNING OUTCOMES The student must be able to: 1.1 Fault Finding Techniques 1.1.1 List and explain the fault finding approach used to locate and correct the malfunctioning of electrical circuit(s) 1.1.2 Name and describe the following different aids concerning the documentation of fault finding: ● Completion of work load ● Equipment problem ● Recommended for repair 1.1.3 Describe the following methods of fault finding ● Scientific approach ● Systematic ● Half – cut method 1.2 Schematic diagrams 1.2.1 Draw and explain the action and reaction Starting methods of the following: ● Direct on line ● Forward – Reverse ● Star-Delta ● Slow fast 1.3 Measuring Instruments 1.3.1 Explain the operations of the following: measuring instruments by means of a labelled circuit diagram. ● Voltage Tester ● Moving coil meter ● Wheatstone Bridge.

Module 2: Light Current

General aim

On completion of this module, the student should be able to know the use of an Oscilloscope and to explain, draw different component of a Resistors, Capacitors, Inductors, Diodes, Cathode Ray Oscilloscope, Transistors and SCR as well as the operation of SCR, CRT and Transistors. LEARNING CONTENT LEARNING OUTCOMES The student must be able to: 2.1 The Cathode Ray Oscilloscope 2.1.1 Draw a circuit diagram or block diagram of the Cathode Ray Oscilloscope and label the main parts. 2.1.2 List and explain the function of each component of a Cathode Ray Oscilloscope. 2.2 Electronics components 2.2.1 Explain the factors which affect resistors and factors which influence the capacitors of capacitances, name the types of resistors and capacitors. 2.2.2 Name advantages of metal oxide resistor and Ceramic capacitors. 2.2.3 Draw the IEC symbol of the following components: ● Capacitors ● Resistors. ● Inductor ● Zener diode ● Transistor 2.2.4 Draw a of fully labelled circuit diagram the half-wave rectifier and full wave rectifiers, show the input and out wave forms. 2.2.5 Explain how to test a diode to determine if it is faulty or not. 2.2.6 Draw a fully labelled characteristics curve of a silicon diode. 2.2.7 Make a sketch of a diode to show the methods that is used to compensate for the Zener diode temperature coefficient effect during manufacturing. 2.3 Diodes and their applications 2.3.1 Name the types of diodes and draw their IEC symbols. 2.3.2 Draw fully labelled characteristics curves of different diodes. 2.3.3 State the applications of different diodes. 2.3.4 Explain the operational principles of diodes. 2.4 Transistors and SCR’s 2.4.1 Name THREE elementary amplifier circuits. 2.4.2 Draw an NPN transistor showing the correct DC biasing.

2.4.3 Draw a circuit to show how an SCR can be used to control the power from DC source into a load resistor. 2.4. 2.4. Name THREE methods that will cause an SCR to conduct electricity. Explain how convectional current flows through an NPN transistor when it is forward biased. 2.4.6 Draw two equivalent SCR transistor circuit and explain its operation. 2.4.7 Find solutions to different calculations of Zener diode and transistor: ● Calculate the series resistance (Rs) of a Zener diode. ● Calculate the load resistance (RL) of a Zener diode. ● Calculate the supply voltage of common emitter amplifier Vcc. ● Calculate the base resistance Rb. ● Calculate the collector resistance Rc. ● Calculate the collector current Ic. ● Calculate the emitter collector for voltage Vce. Module 3: BINARY LOGIC AND BOOLEAN ALGEBRA The field of digital electronics make use of many devices which have only two possible conditions or `states’. Some familiar devices having only two states which is on or off. Binary logic is a name given to the process where the factors or variable being considered in only one or the other of two states. 3.Logic circuits 3.1 Draw the IEC symbol, electronic circuit and truth table of the following: ● “OR” gate, ● “AND “gate, ● NOT gate(inverter), ● “NOR” gate ● “NAND” gate 3.2 Describe the operation of the following: logic gates ● “OR” gate, ● “AND “gate, ● NOT gate(inverter), ● “NOR” gate ● “NAND” gate 3.3 Simplify and prove Boolean expression. 3.4 State and apply laws and identities of Boolean Algebra. 3.5 Apply De Morgan theorem, to solve or simplify Boolean expressions. 3.6 Demonstrate ability to convert between the binary, and decimal systems