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Diploma in Engineering (Lateral) IV (Fourth) Semester Examination 2011-12 Course Code: DEE474 Paper ID: 0744105 Electrical Circuits and Analysis Time: 3 Hours Max. Marks: 60 Note: Attempt six questions in all. Q. No. 1 is compulsory. 1. a) b) c) d) e) f) g) h) Answer any five of the following. (3x5=15) What is resonance power factor in parallel R-L-C circuit? Calculate the open circuit voltage in the network that have 50 v dc source with series resistance of 38k ohm. Sate the superposition theorem? Is possible to calculate power using this theorem? State the Norton’s theorem along with the process of calculation of Norton’s equivalent resistance with independent source. Why series resonant circuit is called as an accepter circuit and parallel resonant circuit as a rejecter circuit? Three sinusoidal voltages acting in series are given by V2 10 2 sin( 440t 45) and V1 10 sin 440t , V3 20 cos 440t then determine the frequency and rms value of resultant voltage. A metal filament lamp, rated at 750W, 100V is to be connected in series with a capacitance across a 230V, 50Hz supply. Calculate the value of capacitance required. Draw the phasor diagram. Define the term selectivity in reference to parallel RLC circuits. 2. Explain the two wattmeter method to measure the power in three phase ac circuits. (9) 3. Derive the resonance condition for series RLC circuit. (9) 4. A coil with a resistance of 10W and an inductance of 125mH is connected in series with a 60m F capacitor across a 120V supply. At what frequency does resonance occur, find the current flowing at the resonant frequency? (9) 5. Derive the power factor and impedance for parallel RLC circuits. (9) 6. State and derive maximum power transfer theorem for d.c. networks. (9) 7. By using superposition theorem, calculate the current in the arm R3. (9) Figure…. 8. For a given Star network, convert it to its equivalent Delta network, if RA=6 ohm, RB=2 ohm, RC=3 ohm. (9) Figure…