MODULE-04 ELECTRONIC FUNDAMENTALS ​Category B1 and B3: 20 MCQ, Time allowed: 25 minutes. B2 40 MCQ, Time allowed: 50 minutes. 4.1 - Semiconductors 4.1.1 - Diodes (a)Description and Characteristics: Level-B1-2,B2-2 & No. of MCQs B1-8,B2-8. Diode symbols; Diode characteristics and properties; Diodes in series and parallel; Main characteristics and use of silicon controlled rectifiers (thyristors),light emitting diode, photo conductive diode, varistor, rectifier diodes; Functional testing of diodes. ​ ​(b)Operation & Function: Level-B1-Nil,B2-2 & MCQs B1-Nil,B2-7. Materials, electron configuration, electrical properties; P and N type materials: effects of impurities on conduction, majority and minority characters; PN junction in a semiconductor, development of a potential across a PN junction in unbiased, forward biased and reverse biased conditions; Diode parameters: peak inverse voltage, maximum forward current, temperature, frequency, leakage current, power dissipation; Operation and function of diodes in the following circuits: clippers, clampers, full and half wave rectifiers, bridge rectifiers, voltage doublers and triplers; Detailed operation and characteristics of the following devices: silicon controlled rectifier (thyristor), light emitting diode, Schottky diode, photo conductive diode, varactor diode, varistor, rectifier diodes, Zener diode. ​ 4.1.2 - Transistors (a)Description&Characteristic:Level-B1-1,B2-2 & MCQs B1-4,B2-4. Transistor symbols;Component description and orientation;Transistor characteristics and properties. ​​​ (b)Construction & OperationFilters:Level-B1-Nil,B2-2 & MCQs B1-Nil,B2-7. Construction and operation of PNP and NPN transistors; Base, collector and emitter configurations; Testing of transistors; Basic appreciation of other transistor types and their uses; Application of transistors: classes of amplifier (A, B, C); Simple circuits including: bias, decoupling, feedback and stabilisation; Multistage circuit principles: cascades, push-pull, oscillators, multivibrators, flip-flop circuits. ​​ 4.1.3 - Integrated Circuits (a)Description & Characteristics Level-B1-1,B2-2 & No. of MCQs B1-3,B2-2. Description and operation of logic circuits and linear circuits/operational amplifiers; 1 ​​ (b) Description and operation: Level-B1-Nil,B2-2 &No.ofQuestions B1-Nil,B2-4. of logic circuits and linear circuits;Introduction to operation and function of an operational amplifier used as: integrator, differentiator, voltage follower, comparator; Operation and amplifier stages connecting methods: resistive capacitive, inductive (transformer), inductive resistive (IR), direct; Advantages and disadvantages of positive and negative feedback. 4.2 - Printed Circuit Boards Level-B1-1,B2-2 & No. of MCQs B1-2,B2-3. Description and use of printed circuit boards. 4.3 - Servomechanisms (a) Principles : Level-B1-1,B2-2 & No. of MCQs B1-3,B2-2. Understanding of the following terms: Open and closed loop systems, feedback, follow up, analogue transducers; Principles of operation and use of the following synchro system components/features: resolvers, differential, control and torque, ransformers, inductance and capacitance transmitters. (b) Construction,Operation & Use: Level-B1-0,B2-2 & No. of MCQs B1-0,B2-3. Construction operation and use of the following synchro system components: resolvers,differential, control and torque, E and I transformers, inductance transmitters, capacitance transmitters, synchronous transmitters; Construction, operation and use of servomechanism and PID controller;Fault-finding of servo defects, reversal of synchro leads, hunting.