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NATIONAL CERTIFICATE IN ENGINEERING ASSIGNMENT SERIES AND PARALLEL RESONANT CIRCUITS ENGINEERING SCIENCE OUTCOMES 3 STUDENT NAME........................................ Tutor’s comments on the knowledge being assessed. Tutor’s comments on the skills and outcomes being assessed. Other comments e.g. on learner’s attendance Learner’s comment on feedback and assessment. COMMON SKILLS 2 15 12 Manage own time in achieving objectives Apply numerical skills and techniques Use information sources ASSESSMENT CRITERIA DISTINCTION The completed assignment satisfies all criteria. All formulae are stated and used correctly, all calculations and working out are shown and correct answers are obtained. The work is handed in on time. MERIT The completed assignment satisfies all criteria. Formulae are used correctly and calculations with working out are shown obtaining correct answers. The work is handed in on time. PASS The completed assignment satisfies all criteria. Formulae are used, some calculations and working out is shown, some correct answers are obtained. The work is handed in on time. REFERRAL Incomplete, criteria unsatisfactorily carried out. No formulae used, little or No calculations and working out, all answers incorrect. The work is handed in late. RE-SUBMISSION A fail or referral grade may be re-submitted with additional work on the understanding that no higher grade than a pass may be awarded. Equipment and components required Signal Generator Dual channel oscilloscope Digital Multimeter Resistors 1k0, 100R, 1R0 Inductor 100 mH Capacitor 0.1F Task 1 Series Resonance Construct a series circuit with R = 1k, l = 100mH and C = 0.1F. Connect across a generator and set the output to 5V peak-to-peak. Maintain this voltage throughout the experiment. Vary the frequency from 500 Hz to 3 kHz in 100 Hz steps. At each frequency measure the supply current and calculate the circuit impedance Z = V/I. Plot graphs of supply current and impedance versus frequency. Estimate the resonant frequency of the circuit. Sketch waveform diagrams of supply voltage and current at 1 kHz, 3 kHz and at resonance. Decide whether the circuit is inductive or capacitive at 1 kHz and 3 kHz. Task 2 Parallel Resonance Construct a parallel circuit with R = 100, L = 100mH and C = 0.1F. Perform the same measurements as for the series circuit and produce waveform sketches at 1kHz, 3kHz and at resonance. Calculations for each circuit Calculate fo. Sketch phasor diagrams at 1kHz, 3 kHz. Decide whether each circuit is inductive or capacitive at these frequencies. Include in the assignment diagrams of series and parallel resonant circuits. Note: If you supply the circuits with a co-axial cable it will add capacitance to the circuit an so alter the resonant frequency of each circuit. You may wish to enter your results into a spreadsheet on a computer and produce the waveform diagrams that way.