Radio, Television and Electronics Works

Below is this year’s WAEC syllabus for  Radio, Television and Electronics Works.

Note that this syllabus is for both Internal and external candidates.

PREAMBLE

This examination syllabus evolved from the Senior Secondary School curriculum for Trade Subjects. It is intended to give candidates:

• insight into the world of Radio, Television and Electronics Works;
• improve their attitude toward the maintenance and repairs of radio, television and electronic equipment, and
• enable them to appreciate the relationship between science and technology.

OBJECTIVE

The objective of the syllabus is to test the candidates’ knowledge and understanding of the following:

• Workshop Safety Rules and Regulations;
• Basic Electricity;
• Electronic Tools and Instruments;
• Electronic Devices and Circuits;
• Electronic Communication Systems;
• Workshop Practice and Maintenance;
• Entrepreneurship in Radio, Television and Electronics Works.

EXAMINATION SCHEME

There will be three papers, Papers 1, 2 and 3, all of which must be taken. Papers 1 and 2 shall be composite papers to be taken in one sitting.

PAPER 1:

This paper (paper 1) will consist of forty multiple-choice objective questions, all of which are to be answered in 45 minutes for 40 marks.

PAPER 2:

Paper 2 will consist of six short-structured questions. Candidates will be required to answer any four in 1 hour for 60 marks.

PAPER 3:

This paper will be a practical test of 2-hour duration. It will consist of three skill-based questions, out of which candidates will answer two for 90 marks.

A list of materials for the test shall be made available to schools not less than two weeks before the paper is taken for materials procurement and relevant preparations.

Alternative to Practical Work:

Alternatively, in the event that materials for the actual practical test cannot be acquired, the Council may consider testing theoretically candidates’ level of acquisition of the practical skills prescribed in the syllabus. For this alternative test, there will be two compulsory questions to be answered in 2 hours for 100 marks.

Industrial Attachment:

This should be done by the candidates during the long vacation between their SS II and   SS III course. It will be supervised and assessed by their subject teachers. It will carry 10 marks.

Radio, Television and Electronics Works WAEC DETAILED SYLLABUS

The following 7 topics must be understood in the subject:

1. Workshop Safety Rules and Regulations

• 1.1  Sources and Prevention of Hazards
• 1.2  Safety Checks in Servicing Radio Receiver
• 1.3  Safety Precautions in Television Workshop

Notes:

Students must understand the following in the topic: Workshop Safety Rules and Regulations:

• Concept of safety
• Sources of hazards
• Treatments should include electric shock, damp or wet floors, wrong handling of tools, improper workshop dressing, and horseplay in the workshop.
• Preparation of work areas
• Capacitor discharges
• Working on power lines and live circuits
• Handling of tools
• Power supplies in T.V.
• Picture tube
• High voltage section
• Component rating

2. Basic Electricity

Under the topic, Basic Electricity, candidates must fully understand the following:

• 2.1 Structure of matter

  • Note:
  • Definition and structure of matter
  • Atomic structure.

• 2.2 Conductors, insulators and semiconductors

  • Note:
  • Qualitative treatment only – definition and uses

• 2.3 Current, Voltage and Resistance

  • Note:
  • Definition, units and symbols of voltage, current and resistance
  • Laws of attraction and repulsion of charges

• 2.4 Electronic components

  • Note:
  • Identification of components by name, type, graphical symbol, value and rating
  • Treatments should include resistors, capacitors, inductors, diodes, transformers, transistors, integrated circuits etc

• 2.5 Resistors and Capacitors

  • Note:
  • Graphical symbols, types, values and ratings
  • Colour code of  resistors and capacitors
  • Comparison between meter measured and colour code values
  • Testing of capacitors

• 2.6 Kirchhoff’s  Current and Voltage Laws

  • Note:
  • Concepts, definitions and calculations

• 2.7 Diodes and Transistors

• • Note:
  • Types, graphical symbols and structureTreatments should include testing for diodes and transistor configuration (CC, CE and CB)

• 2.8 Battery

• • Note:
  • Graphical symbol of a battery( primary cell and secondary cell) and types
  • Testing of battery
  • Treatments should include the difference between wet and dry cells

• 2.9 Ohm’s law

  • Note:
  • Definition
  • Symbols and relationship between voltage, current and resistance.
  • Resistors in series and parallel

• 2.10 Electric power

  • Note:
  •  Definition, Measurement and Calculations

• 2.11 Direct and Alternating Current

  • Note:
  • Definitions, differences, uses and measurements of d.c. and a.c.

• 2.12 Alternating waveform

  • Note:
  • Definition and calculation
  • Treatments should include r.m.s., peak and average values, frequency and period in an a.c. waveform

3. Electronic Tools and Instruments

Students must understand the following in the topic: Electronic Tools and Instruments:

• 3.1 Electronic hand tools

  • Note:
  • Types and uses
  • Treatments should include screwdrivers, diagonal cutters, soldering guns, soldering iron, lead sucker or de-soldering tools, pocket knife, stripper and soldering wick.

• 3.2 Electronic measuring instruments

  • Note:
  • Identification, uses and operation
  • Treatments should include a voltmeter, ammeter, ohmmeter, multimeter
  • Basic a.c. and d.c. circuit, measurements of voltage, current and resistance
  • Ohmmeter for testing semiconductor devices
  • Identification of faulty meter

• 3.3 Fault-Finding Equipment

  • Note:
  • Identification, uses and operationTreatments should include an oscilloscope, signal tracer, digital frequency counter, logic probe, TV analyzer

4. Electronics Devices and Circuits

Students must understand the following subjects in the topic: Electronic Devices and Circuits:

• 4.1 Meaning of Electronics and Electronic Circuit

  • Note:
  • Definition and Application

• 4.2 Concept of Emission and photoelectric devices

  • Note:
  • Definition and application
  • Treatments should include types of emission e.g. Thermionic, photoelectric, field and secondary

• 4.3 Semiconductors devices

  • Note:
  • Semiconductor theory  and typesSemiconductor diodesTreatment should include rectification, principles of operation, characteristics and application

• 4.4 Power Supply Unit

  • Note:
  • Principle and operation, schematic diagram
  • Rectification and types
  • Filters
  • Construction of stabilized low d.c. power supply unit

• 4.5 Amplifiers

  • Note:
  • Operation, construction and uses of Class A, B, C and AB amplifiers

• 4.6 Resistive, Inductive, Capacitive (RLC) circuits

  • Note:
  • Quantitative treatments only

• 4.7 Feedback

  • Note:
  • Concept of feedback
  • Differences between types and their advantages
  • Effect of positive feedback on amplifiers, bandwidth, noise, gain and distortion

• 4.8 Oscillators and Multivibrators

  • Note:
  • Principle and types of oscillator
  • Construction of a typical oscillator circuit
  • Types of multivibrator
  • Treatments to include astable, bistable and monostable

5. Electronic Communication Systems

Students must understand the following subjects in the topic: Electronic Communication Systems

• 5.1 Electronic Communication Systems

  • Note:
  • Definition and types
  • Block diagram, operation  and function of each stage
  • Noise

• 5.2 Electromagnetic spectrum

  • Note:
  • Definition and classification
  • Propagation of radio waves
  • Radiofrequency band- VLF, LF, MF, HF, VHF, UHF, SHF and EHF
  • Application of frequency range in electronic communication – frequency spectrum to be an intensifier

• 5.3 Transducer

  • Note:
  • Definition, types and functions
  • Treatments should include a loudspeaker, microphone, video camera, and video display unit(cathode ray tube(CRT), Liquid Crystal Display(LCD))

• 5.4 Modulation and Demodulation

  • Note:
  • Definition, the principle of operation and types of modulation
  • AM and FM  waveforms and envelopes
  • Percentage of modulation – modulation index and modulation factor
  • Meaning and function of a carrier wave in radio communication.
  • Definition and types of demodulation

• 5.5 Radio transmitter and receiver

  • Note:
  • Function(s) and operation
  • Block diagram and function of each stage
  • Types of radio receivers – Tuned Radio Receivers (TRF), superheterodyne receivers (FM and AM)
  • Advantages and disadvantages of each

• 5.6 Selectivity and Sensitivity

  • Note:
  • Definition
  • Concept and function of a tuner in radio receiver
  • Identification of tuner stage in radio receiver

• 5.7 Resonant circuit

  • Note:
  • Definition, types of resonance ( series and parallel)
  • Concept of bandwidth and bandwidth ranges
  • Calculations involving frequency ranges to determine bandwidth
  • Treatments should include derivation of the formula for resonant frequency

• 5.8 Satellite Communication Systems

  • Note:
  • Elements and types
  • Transmission and reception
  • Antenna

• 5.9 Television Transmitter

  • Note:
  • Working principle
  • Block diagram
  • Stages

• 5.10 Image and Sound Reproduction in TV Receiver

  • Note:
  • Principle of scanning
  • Video signals
  • Principle of FM detection

• 5.11 Monochrome Television Receiver

  • Note:
  • Concept of Television
  • Function and operation
  • Application of television system

• 5.12 Principles of Operation of Colour Television Receiver

  • Note:
  • Block diagram and function of each stage
  • Processing of picture and sound signal

• 5.13 Principle of Colour Signal, Transmission and Reception

  • Note:
  • Primary colours  in television
  • Colour television systems and standards – PAL, SECAM and NTSC
  • Colour signal components

6. Workshop Practice and Maintenance

Students must understand the following subjects in the topic: Workshop Practice and Maintenance.

• 6.1 Soldering and Desoldering in Electronic Circuits

  • Note:
  • Techniques and precautions
  • Types of solder
  • Types of flux – amber resin and NaCl solutions

• 6.2 Electronic Repairs

  • Note:
  • Dismantling and reassembling of the power supply unit in a radio set
  • Dismantling and reassembling RF, IF detector
  • Stages in a radio receiver set
  • AF amplifier circuit
  • Installation and maintenance of a car radio set

• 6.3 Fault finding and repairs in radio receiver

  • Note:
  • Diagnose faults by using fault-finding pieces of equipment and logical troubleshooting procedure
  • Components responsible for faults
  • Remedies for the faults
  • Alignment of RF and IF stages of a radio set using the necessary equipment and tools

• 6.4 Electronic Measuring Instruments

  • Note:
  • Use of multimeter
  • Treatments should include measurement of the correct value of current, voltage and resistance in active and passive electronic components and circuits

• 6.5 Diagnosis and Repair of Black and White TV Receiver

  • Note:
  • Procedure for TV repairs
  • Use of service information manual and circuit diagram
  • Identification of symptoms and repair of faults
  • Fault clearing instruments

• 6.6 Diagnose and Repair of a Colour Television Receiver

  • Note:
  • Symptoms of faults
  • Fault clearing at each stage
  • Static and dynamic colour convergence comparison
  • Colour bar generator and signal testing

 

7. Entrepreneurship in Radio, Television and Electronic Works

Students must understand the following in the topic: Entrepreneurship in Radio, Television and Electronic Works.

• 7.1 Business Management and Finance

  • Note:
  • Accounting practices
  • Cost-benefit analysis
  • Purchasing method
  • Business records (Accounting ledger, Repair order form, Inventory sheet)
  • Sources of capital e.g. Banks and Credit Unions

• 7.2 Customer Relations

  • Note:
  • Daily appearance at work
  • Customer psychology
  • Working relations
  • Telephone courtesy

• 7.3 Business Opportunities in Radio, TV and Electronics Works

  • Note:
  • Business Opportunities in Radio and TV Work
  • Satellite installation
  • Electronic specialist
  • Radio and TV consultant
  • Radio and TV technician
  • Sales and Service Craft man
  • Antenna and TV installation work

LIST OF FACILITIES AND MAJOR EQUIPMENT/MATERIALS REQUIRED

As part of the Radio, Television and Electronics Works WAEC Syllabus, the following equipment are essential:

•  Screwdrivers
•  Diagonal cutters
•  Soldering gun, iron and lead
•  Desoldering tools
•  Pocket knife
•  Stripper
•  Semiconductor diodes
•  Digital and analog multimeters
•  Loudspeaker, microphone
• Cathode Ray Tube/LCD
• Nose pliers
• Old electronics panel
• Resistors, capacitors, inductors, transistors
• Vero board/breadboard
• C. power supplies
• Transformers
• Radio and television sets
• Oscilloscope
• Signal generator
• Magnifying glass
• Pattern generator (TV)

 

That is all for WAEC Syllabus for Radio, Television and Electronics Works. Please share this information with other students.

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