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ELECTRICAL TECHNOLOGY
SENIOR FOUR
TOPIC AND SUB -TPOICS
1.
1.1
1.2
1.3
Safety
(Identify risks of accidents)
Risks of accidents;
Before starting work, ask the tutor; Keep your work
station clean; Use tools appropriately.
Names & uses of tools; Report any injury, Don’t leave
controls of a machine in motion,
Be attentive at your work, ask permission before using
electrical tools , comply with instructions, use proper
methods for lefting or moving objects
1.4
-Protect environment
-Think before acting
-Know the location of fire extinguishers and learn how to
use them
1.5
-Ensure that equipment is in good order before use
-When you use a piece of equipment for the first time, ask
for information even if you believe you know how to use
it, lack of knowledge can be dangerous and repairs of
equipment are expensive
1.6
2.
2.1
First aid and First aid treatment ( at least four methods.)
Electrical Circuits
Conductors and Insulators
2.2
Cables and joints
2.3
Circuits and sub-circuits (Lighting and power circuits).
EXPECTED NUMBER OF
QUESTIONS FROM @ TOPIC
3
5
2.4
Conduits, trunkings and Ducting.
SECOND TERM:
3
3.1
3.2
3.3
4.
4.1
4.2
4.3
5
5.1
5.2
5.3
5.4
Illumination
Definitions, lighting laws and related calculations
Types of lighting fittings
Determination of lighting points
Signalling systems
Different types of bells
Fire alarm systems
Burglary alarm systems
Circuit protection
Fuses
Circuit breakers
Earthing systems
RCDs
3
3
4
THIRD TERM
6.
7.
7.1
7.2
7.3
7.4
Electrical standard definitions
Electrical systems
TT systems,
IT systems
TN-C systems
TN-C-S systems
ELECTRICAL TECHNOLOGY
SENIOR FIVE
2
1
FIRST TERM
1.
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
1.10
2.
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
COMTACTORS
Definition of terms used
General construction
Different types
Different categories
Operation principles
Special features: Arcing, Interlocks and labeling
Special contactors
Standard symbols
Name plate
Faults, Causes and remedies
Relays
Definition of terms used
General construction
Different types
Different categories
Operation principles
Interlocks
Special relays: ON delayed, OFF delayed, etc
Standard symbols
Factors affecting their choices
Faults, Causes and remedies
4
3
TERM TWO
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4
4.1
D.C GENERATORS
Construction and constructional parts
Generator action of commutator
Types of D.C armature windings
E.M.F equation of a D.C Generator
Types of D.C Generators
Losses in D.C Machines
Power stages
Efficiency and Maximum efficiency
Related calculations
ARMATURE REACTION
Geometrical and Magnetic neutral axes
4
2
4.2
4.3
4.4
5
5.1
5.2
5.3
5.4
5.5
Explanation on armature reaction
Commutator and commutation
Methods of improving commutation
D.C Generator characteristics
Voltage build up
Critical field resistance
Voltage regulation
Parallel operation of D.C Generators
Shunt down of generators
2
TERM THREE
6
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11
6.12
6.13
6.14
6.15
6.16
6.17
D.C MOTORS
The motor & working principle
Back E.M.F and its significancy
Voltage equation of a D.C Motor
Power equation and maximum power
Types of D.C motors
Armature torque
Shaft torque
Speed of D.C Motor
Related calculations
Armature reaction in D.C Motor
Commutation in D.C Motor
Losses in D.C Motor
Efficiency
Power stages
D.C Motor characteristics
Application
Faults, Causes and remedies
6
7
7.1
7.2
7.3
7.4
SPEED CONTROL
Speed control and speed control methods
Electric braking
Motor starters
Testing of D.C Machines
2
ELECTRICAL TECHNOLOGY
SENIOR SIX
FIRST TERM
8
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
8.10
8.11
8.12
8.13
8.14
9
9.1
9.2
9.3
Transformers
Introduction, Ideal and No load transformer
E.M.F Equation and Voltage transformation ratio
Practical loaded transformer
Phasor diagrams and related calculations
Shifting impedances and related calculations
Equivalent circuit of transformer
Transformer tests
Transformer ratings and losses
Types of transformers
Cooling of transformers
Auto transformers
Advantages and disadvantages of Auto transformers
Application of auto transformers
Parallel operation of transformers
Three phase transformers
Three phase transformer connections
Applications of transformers
Instrument transformers
SECOND TERM
10
Three phase Induction motors (Asynchronous Motors)
10.1 Introduction to three phase induction motors
10.2 Advantages and disadvantages
10.3 Construction
10.4 Operation
10.5 Rotor constants
10.6 Starting torque
10.7 Maximum torque
10.8 Motor conditions under load
10.9 Comparison between Induction motors and
transformers
10.10 Speed regulation
10.11 Speed control
6
3
5
10.12
10.13
10.14
10.15
10.6
11
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
11.9
11.10
11.11
11.12
11.13
Power stages and losses of induction motors
Equivalent circuit
Methods of starting a motor
Squirrel cage motors versus Slip ring motors
Motor nameplate
Single phase motors
TERM 3
SYCHRONOUS MOTORS
Introduction
Construction
Principle of operation
Making synchronous motors self starting
Equivalent circuit
Terms used
Phasor diagram
Motor on load
Power stages and losses
Motor torue
Power factor of synchronous motors
Application
Comparison between Synchronous and Asynchronous
motors
3
4