PAPER III
Category E : Electrical Systems
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1. Electrical Theory
Detailed knowledge of Ohms law, Kirchoff's laws and Electro-
magnetic Induction; their applicability in the aircraft
industry.
Detailed knowledge of the Alternating Current and calcula-
tion of Instantaneous value, RMS value, frequency and ampli-
tude from the given data; star and delta connections and
calculation of power in three phase system.
Detailed knowledge of series and parallel resonance of AC
circuits and their use; calculation of resonant frequency of
a circuit from a given information; effect of change in the
frequency on the impedance, current and phase angle.
Detailed knowledge of the composition, performance (stabili-
ty and tolerance) and limitations of the fixed resistors
(carbon composition, carbon film, wire wound and metallic
film) and description of various types of variable resistors
(wire wound, carbon film, thermistors and voltage dependent
resistors and varistors).
Knowledge of the resistor colour codes, value and tolerance,
and the system of preferred values and wattage ratings.
Detailed knowledge of the construction, principles of opera-
tion, application and colour coding of various types of
capacitors.
Detailed knowledge of Circuit Controlling and Current Pro-
tection Devices.
2. Aircraft Batteries
Knowledge of the construction and principle of operation of
Lead acid and Nickel Cadmium batteries, composition of
electrolytes and plates.
Knowledge of the effect of temperature on capacity, specific
gravity, electrolyte resistivity, charger and discharger
rates; effect of specific gravity on freezing temperature
and resistivity of electrolytes.
Knowledge of methods of charging of batteries; precautions
and procedures during charging; mixing and neutralization of
electrolytes; importance of ventilation of battery compart-
ments.
Knowledge of the inspections to determine conditions and
serviceability of batteries; common battery defects and
their rectification.
3. Generators and Motors
Knowledge of the construction, principle of operation and
characteristics of DC and AC Generators and Motors.
Knowledge of the construction, principles of operation of
voltage regulators; and paralleling of generators.
Detailed knowledge of the functional tests, adjustments and
trouble shooting of generators and motors.
Knowledge of speed control and reversing the direction of
motors.
4. Servomechanisms and Amplifiers
Knowledge of construction and principles of
autotransformers, single and three phase transformers
Knowledge of construction and principles of operation of
saturable reactors and magnetic amplifiers; bias; phase
sensitive half wave and inputs and outputs, polarity sensi-
tive inputs and outputs, pushpull outputs and effects of
stage gains and cascading on time response.
Knowledge of construction, principle and operation of servo-
motors and rate generators; system response to displacement
(position) and rate (velocity) command signals; purpose of
pullup and rate feedback signals; causes of hunting and
methods of damping; troubleshooting of servomechanism.
5. Test Equipment
Knowledge of the construction, principle of operation, use
and precautions to be observed for aircraft test equipments.
6. Bonding and Screening
Knowledge of purpose of bonding and shielding and differ-
ence between the two, precaution, methods employed; minimum
acceptable standards for insulation and bonding; and test-
ing.
Detail knowledge of aircraft wiring system; procedure of
laying of electrical cables and precautions to be taken
thereof.
7. Electronics
Knowledge of the basic principles of thermionics.
Knowledge of properties of semiconductor materials.
Knowledge of construction, symbols, operation and anode
characteristics of vacuum and gas-filled tubes; knowledge of
their construction and application.
Knowledge of construction, symbols, doping process, opera-
tion, application and characteristics of PNP and NPN tran-
sistors; comparison with vacuum tubes.
Knowledge of use and theory of oscillators and multivibra-
tors.
Knowledge of symbols, truth tables and equivalent circuits
for logic gates.
Knowledge of the terms, operation and application of Flip
Flop logic.
Knowledge of the terms used, basic operation, interfacing of
the major components of a Computer.
Knowledge of operation, use and types of Medium Scale Inte-
gration (MSI) Devices.
Knowledge of the types and operation of displays (LED,
Liquid crystal etc.).
Knowledge of CRTs and its application.
Knowledge of functions performed and overall operation of a
microprocessor.
Knowledge of handling of microelectronic circuit devices
(Electrostatic Sensitive Devices (ESD)).
8. Aircraft System
Knowledge of principle of operation, inspection and trouble
shooting of aircraft galley equipments, aircraft lights,
and electrical components and indicating circuits for
Landing Gear, Flap System and Airconditioning system etc.
Knowledge of operation and inspection of Aircraft Fire and
Smoke Detection and Protection System.
9. Power Distribution
Knowledge of electrical power distribution systems, the
operation and construction of static inverters, rotary
inverters and transformer rectifier units.