1 2020_21 BTEC Assignment Brief Template Issue Date: June 2020 Owner: BTEC Assessment DCL1 Public (Unclassified) Version 1.0 BTEC Assignment Brief Qualification BTEC Higher Nationals in Engineering...

at the bottom of the assignment there's a table of names for what numbers were using and I've been chosen for "John"


1 2020_21 BTEC Assignment Brief Template Issue Date: June 2020 Owner: BTEC Assessment DCL1 Public (Unclassified) Version 1.0 BTEC Assignment Brief Qualification BTEC Higher Nationals in Engineering Unit or Component number and title Unit 19: Electrical and Electronic Principles M/615/1493 Level 4 Learning aim(s) (For NQF/RQF only) LO2 Analyse circuits with sinusoidal voltages and currents. Assignment title LO2 Analyse circuits with sinusoidal voltages and currents. Assessor Stephen Hillyard Hand out date Wednesday 17th Feb 2021 Hand in deadline Wednesday 10th March 2021 Vocational Scenario or Context You are employed as an Electrical/Electronic specialist at a Northampton Electrical Engineering consultancy firm. The company carry out design and build of prototype electronic circuits and as part of your role you are required to carry out the calculations using your AC theory skills in order that the correct component values and frequencies are found. Task 2 Instructions to students: Please determine the answers to each of the questions using your allocated values for each question which as been assigned to you in the table at the end of the document. 1a) A coil of resistance Aꭥ is in series with inductance of 120mH and also in series with a 100µF capacitor is connected to a 300V, 50Hz supply. Draw the circuit diagram, and then calculate (a) the current flowing, (b) the phase difference between the supply voltage and current, (c) the voltage across the coil and (d) the voltage across the capacitor, (e) Sketch the phasor diagram showing that V is the phasor sum of VCOIL and Vc. 2 2020_21 BTEC Assignment Brief Template Issue Date: June 2020 Owner: BTEC Assessment DCL1 Public (Unclassified) Version 1.0 1b) The following three impedances are connected in series across a supply of B Volts and frequency of C kHz supply: (i)resistance of 8ꭥ, (ii) a coil of inductance 130µH and 5ꭥ resistance and (iii) a 10ꭥ resistor in series with a 0.25µF capacitor. Draw the circuit diagram and then calculate (a) the circuit current (b) the circuit phase angle and (c) the voltage drop across each impedance. 2a) A coil of resistance Dꭥ and inductance of 318.4mH and resistance is connected in parallel with a 15µF capacitor across a 200V, 50Hz supply. Calculate (a) the current in the coil and its phase angle, (b) the current in the capacitor and its phase angle, (c) the supply current and its phase angle, (d) the circuit impedance (e) the power consumed, (f) the apparent power and (g) the reactive power. Draw the phasor diagram. 2b) A coil with an internal resistance of E kꭥ and an inductance 0.2 H and resistance is connected in parallel with a variable capacitor set at 25nF and is supplied at 100 V at a frequency of 4 kHz. Determine (a) the current in the coil, and (b) the current in the capacitor, (c) Draw to scale the phasor diagram and measure the supply current and its phase angle; check the answer by calculation. Determine (d) the circuit impedance and (e) the power consumed. 3a) A coil of inductance 100 mH and negligible resistance is connected in series with a capacitor of 2µF and a resistance of Fꭥ across a 50V, variable frequency supply. Determine (a) the resonant frequency, (b) the current at resonance, (c) the voltage across the coil and the capacitor at resonance and d) the Q-factor of the circuit. 3b) A coil with internal resistance of Gꭥ and an inductance of 100mH is connected in parallel with a variable capacitor across a 12V, 5kHz supply. Determine the condition when the supply current is a minimum: (a) the capacitance of the capacitor ( b) the dynamic resistance, (c) the supply current and (d) the Q-factor. Checklist of evidence required Criteria covered by this task: Unit/Criteria reference To achieve the criteria you must show that you are able to: LO2 Analyse circuits with sinusoidal voltages and currents. P2 Analyse series RLC circuits, using the principles of circuit theory with sinusoidal sources. M2 Analyse series and parallel RLC circuits, using the principles of circuit theory with sinusoidal sources. D2 Analyse the operation and behaviour of series and parallel RLC circuits, including resonance and using the principles of circuit theory with sinusoidal sources. 3 2020_21 BTEC Assignment Brief Template Issue Date: June 2020 Owner: BTEC Assessment DCL1 Public (Unclassified) Version 1.0 L02 data A ꭥ B ꭥ C kHz D ꭥ E kHz F G Liam 4.0 32 14.5 51 1.2 9.3 735 Lee 4.1 33 15 52 1.3 9.4 740 Livui 4.2 35 15.5 53 1.4 9.5 745 George 4.3 36 16 54 1.5 9.6 750 Bradley 4.4 37 16.5 55 1.6 9.7 755 Brett 4.5 38 17 56 1.7 9.8 760 James 4.6 39 17.5 57 1.8 9.9 765 Luca 4.7 40 18 58 1.9 10.0 770 Ben 4.8 41 18.5 59 2.0 10.1 775 Daniel 4.9 42 19 60 2.1 10.2 780 Danyal 5.0 43 19.5 61 2.2 10.3 795 Thomas 5.1 44 20 62 2.3 10.4 800 Jordan 5.2 45 20.5 63 2.4 10.5 805 Charlotte 5.3 46 21 64 2.5 10.6 810 Matthew 5.4 47 21.5 65 2.6 10.7 815 Jack 5.5 48 22 66 2.7 10.8 820 Jared 5.6 49 22.5 67 2.8 10.9 825 Max 5.7 50 23 68 2.9 11.0 830 John 5.8 51 23.5 69 3.0 11.1 835 Sources of information to support you with this Assignment Please refer to notes and lesson recordings to support your completion of this assignment. Other assessment materials attached to this Assignment Brief None