PAPER III Category E : Electrical Systems ___________________________________________________________ 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.