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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 0.1F
Task 1
Series Resonance
Construct a series circuit with R = 1k, l = 100mH and C = 0.1F. 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 = 0.1F. 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.