Thursday, April 11, 2013

EEJ 310 ELECTRICAL CIRCUIT THEORY

Define the terms Electrostatic Flux, Flux density, Field intensity, Electric potential and their units. 2. Find equivalent capacitance when the capacitance are connected in series and in parallel B 1. A circuit consists of three resistors of 3ohm, 3ohm and 6ohm in Parallel and a fourth resistor of 4ohm in series. A battery of EMF 12V and internal resistance 5ohm disconnected across the circuit. a) Draw a diagram of the arrangement. b) Find the total external Resistance c) What is the total current in circuit.d) Total power. 2.The total capacitance of two capacitor is 0.333 F when joined in series and 1.5F when connected in parallel. Find the capacitance of each capacitor. II A 1. State and Explain super position theorem. 2. State and Explain maximum power transfer theorem.Describe the construction of a Nickel iron cell and discuss the chemical action taking place during charging and discharging. 2. Give an account of different charging methods and explain any one method with a circuit diagram.Principle of operation – Constructional details Types of D.C. Generators – Emf equation (Simple problems) – Lap and Wave winding (No winding diagram) – Different types of excitation – OCC of separately excited and self excited (shunt & compound generators) – Load characteristics of Self excited (Series, shunt & compound generators) – Critical resistance – Conditions for self excitation – Armature reaction – Effects and methods of compensation of Armature reaction – Commutation – Causes of voltage drop – Losses – Efficiency – Electrical, mechanical and commercial efficiency- maximum efficiency problems – Applications of D.C. Generators,

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