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.

  1. 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 towards the maintenance and repairs of   radio, television and electronic equipment and enable them to appreciate the relationship between science and technology.

  1. 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.
  1. EXAMINATION SCHEME

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

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

PAPER 3:  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.

  1. DETAILED SYLLABUS

 

 

TOPIC

 

 

NOTES

 

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

 

 

 

 

 

 

 

2. Basic Electricity

 

2.1 Structure of matter

 

 

2.2 Conductors, insulators and semiconductors

 

 

2.3 Current, voltage and resistance

 

 

 

 

2.4 Electronic components

 

 

 

 

 

2.5 Resistors and Capacitors

 

 

 

 

 

2.6 Kirchhoff’s  Current and Voltage Laws

 

 

2.7 Diodes and Transistors

 

 

 

2.8 Battery

 

 

 

 

 

2.9 Ohm’s law

 

 

 

 

2.10 Electric power

 

2.11 Direct and Alternating Current

 

 

2.12 Alternating waveform

 

 

 

 

3. Electronic Tools and Instruments

 

3.1 Electronic hand tools

 

 

 

 

 

3.2 Electronic measuring instruments

 

 

 

 

 

 

 

 

3.3 Fault Finding Equipment

 

 

 

 

4. Electronics Devices and Circuits

 

4.1 Meaning of Electronics and Electronic circuit

 

4.2 Concept of emission and photoelectric devices

 

 

 

4.3 Semiconductors devices

 

 

 

 

4.4 Power Supply Unit

 

 

 

 

 

4.5 Amplifiers

 

 

4.6 Resistive, Inductive, Capacitive (RLC) circuits

 

4.7 Feedback

 

 

 

 

4.8 Oscillators and Multivibrators

 

 

 

 

 

5. Electronic Communication Systems

 

5.1 Electronic Communication Systems

 

 

 

 

5.2 Electromagnetic spectrum

 

 

 

 

 

 

 

 

5.3 Transducer

 

 

 

 

 

5.4 Modulation and demodulation

 

 

 

 

 

 

 

 

 

5.5 Radio transmitter and receiver

 

 

 

 

 

 

5.6 Selectivity and sensitivity

 

 

 

5.7 Resonant circuit

 

 

 

 

 

 

5.8 Satellite Communication Systems

 

 

 

5.9 Television Transmitter

 

 

 

5.10 Image and Sound Reproduction in TV receiver

 

 

 

5.11 Monochrome Television Receiver

 

 

 

 

5.12 Principles of operation of Colour Television

Receiver

 

5.13 Principle of Colour Signal, Transmission and

Reception

 

 

 

6. Workshop Practice and Maintenance

 

6.1 Soldering and Desoldering in Electronic

Circuits

 

 

6.2 Electronic Repairs

 

 

 

 

 

 

6.3 Fault finding and repairs in radio receiver

 

 

 

 

 

 

6.4 Electronic Measuring Instruments

 

 

 

 

 

6.5 Diagnosis and Repair of Black and White TV

Receiver

 

 

 

 

6.6 Diagnose and Repair of a Colour Television

Receiver

 

 

 

 

7. Entrepreneurship in Radio, Television and

Electronic Works

 

7.1 Business Management and Finance

 

 

 

 

 

 

7.2 Customer Relations

 

 

 

 

7.3 Business Opportunities in Radio, TV and

Electronics works

 

 

 

 

Concept of safety

Sources of hazards

Treatments should include electric shock, damp or wet floor, wrong handling of tools, improper workshop dressing, horse play 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

 

 

 

Definition and structure of matter

Atomic structure

 

Qualitative treatment only – definition and uses

 

Definition, units and symbols of voltage, current and resistance

Laws of attraction and repulsion of charges

 

Identification of components by name, type, graphical symbol, value and rating

Treatments should include resistors, capacitors, inductors, diodes, transformers, transistors, integrated circuit etc

 

Graphical symbols, types, values and ratings

Colour code of  resistors and capacitors

Comparison between meter measured and colour code values

Testing of capacitors

 

Concepts, definitions and calculations

 

 

Types, graphical symbols and structure

Treatments should include testing for diodes and transistor configuration (CC,CE and CB)

 

Graphical symbol of a battery( primary cell and secondary cell) and types

Testing of battery

Treatments should include difference between wet and dry cells

 

Definition

Symbols and relationship between voltage, current and resistance.

Resistors in series and parallel

 

Definition, measurement and calculation

 

Definitions, difference, uses and measurement of d.c. and a.c.

 

Definition and calculation

Treatments should include r.m.s., peak, and average values, frequency and period in an a.c. waveform

 

 

 

Types and uses

Treatments should include screw drivers, diagonal cutters, soldering gun, soldering iron, lead sucker or de- soldering tools, pocket knife, stripper and soldering wick

 

Identification, uses and operation

Treatments should include voltmeter, ammeter, ohmmeter, multi meter

Basic a.c. and d.c. circuit, measurements of voltage, current and resistance

Ohmmeter for testing semiconductor devices

Identification of faulty meter

 

 

Identification, uses and operation

Treatments should include oscilloscope, signal tracer, digital frequency counter, logic probe, TV analyzer

 

 

 

Definition

 

Definition and application

Treatments should include types of emission e.g. Thermionic, photoelectric, field and secondary

 

Semiconductor theory  and types

Semiconductor diodes

Treatment should include rectification, principles of operation, characteristics and application

 

Principle and operation, schematic diagram

Rectification and types

Filters

Construction of stabilized low d.c. power supply unit

 

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

 

Quantitative treatments only

 

Concept of feedback

Differences between types and their advantages

Effect of a positive feedback on amplifiers, bandwidth, noise, gain and distortion

 

Principle and types of oscillator

Construction of a typical oscillator circuit

Types of multivibrator

Treatments to include astable, bistable and monostable

 

 

 

Definition and types

Block diagram, operation  and function of each stage

Noise

 

Definition and classification

Propagation of radio waves

Radio frequency band- VLF, LF, MF, HF, VHF,

UHF,SHF and EHF

Application of frequency range in electronic communication – frequency spectrum to be intensified

 

 

Definition, types and functions

Treatments should include loudspeaker, microphone, video camera, video display unit(cathode ray tube(CRT),Liquid Crystal Display(LCD))

 

Definition, 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 carrier wave in radio communication.

Definition and types of demodulation

 

Function(s) and operation

Block diagram and function of each stage

Types of radio receivers – Tuned Radio Receiver(TRF), super heterodyne receivers(FM and AM)

Advantages and disadvantages of each

 

Definition

Concept and function of tuner in radio receiver

Identification of tuner stage in radio receiver

 

Definition, types of resonance ( series and parallel)

Concept of bandwidth and bandwidth ranges

Calculation involving frequency ranges to determine bandwidth

Treatments should include derivation of the formula for resonant frequency

 

Elements and types

Transmission and reception

Antenna

 

Working principle

Block diagram

Stages

 

Principle of scanning

Video signals

Principle of FM detection

 

Concept of Television

Function and operation

Application of television system

 

 

Block diagram and function of each stage

Processing of picture and sound signal

 

Primary colours  in television

Colour television systems and standards – PAL, SECAM and NTSC

Colour signal components

 

 

 

Techniques and precautions

Types of solder

Types of flux – amber resin and NaCl solutions

 

Dismantling and reassembling of 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

 

Diagnose fault by using fault finding pieces of

equipment and logical trouble shooting 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

 

Use of multimeter

Treatments should include measurement of the

correct value of current, voltage and resistance

in active and passive electronic components and

circuits

 

Procedure for TV repairs

Use of service information manual and circuit

diagram

Identification of symptoms and repair of faults

Fault clearing instruments

 

Symptoms of faults

Fault clearing at each stage

Static and dynamic colour convergence comparison

Colour bar generator and signal testing

 

 

 

 

 

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

 

Daily appearance at work

Customer psychology

Working relations

Telephone courtesy

 

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

 

 

  1. LIST OF FACILITIES AND MAJOR EQUIPMENT/MATERIALS REQUIRED
  •  Screw drivers
  •  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)

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