// Numbas version: finer_feedback_settings
{"name": "El Q005 - Rectification & Regulation - Randomised Variables Only", "extensions": [], "custom_part_types": [], "resources": [["question-resources/FoESELQ05_-_DC_power_supply.png", "/srv/numbas/media/question-resources/FoESELQ05_-_DC_power_supply.png"], ["question-resources/FoESELQ05_-_Rectifier_Devices.PNG", "/srv/numbas/media/question-resources/FoESELQ05_-_Rectifier_Devices.PNG"], ["question-resources/FoESELQ05_-_Transformer.PNG", "/srv/numbas/media/question-resources/FoESELQ05_-_Transformer.PNG"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "El Q005 - Rectification & Regulation - Randomised Variables Only", "tags": [], "metadata": {"description": "<p>Question Covering AC power and frquency response</p>", "licence": "All rights reserved"}, "statement": "<h2 style=\"text-align: center;\">Power &amp; Frequency Response</h2>", "advice": "<p>see spread sheet</p>", "rulesets": {}, "extensions": [], "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true, "j": false}, "constants": [], "variables": {"Q5c_R_L": {"name": "Q5c_R_L", "group": "Q5c", "definition": "random(1 .. 3#1)", "description": "<p>Load Resistance (k&Omega;)</p>", "templateType": "randrange", "can_override": false}, "Q5c_C1": {"name": "Q5c_C1", "group": "Q5c", "definition": "random(1 .. 3#1)", "description": "<p>Smoothing Capacitor (uF)</p>", "templateType": "randrange", "can_override": false}, "Q5c_V_S": {"name": "Q5c_V_S", "group": "Q5c", "definition": "random(20 .. 23#1)", "description": "<p>Supply Voltage (V<sub>S</sub>)</p>", "templateType": "randrange", "can_override": true}, "Q5c_Z_BDV": {"name": "Q5c_Z_BDV", "group": "Q5c", "definition": "siground(dec(q5c_v_s*(3/20)),2)", "description": "<p>Zener Diode Reverse Breakdown Voltage (V)</p>", "templateType": "anything", "can_override": false}, "Q5b_N_prim": {"name": "Q5b_N_prim", "group": "Q5b", "definition": "random(40 .. 70#7)", "description": "", "templateType": "randrange", "can_override": false}, "Q5b_N_sec": {"name": "Q5b_N_sec", "group": "Q5b", "definition": "random(10 .. 25#3)", "description": "", "templateType": "randrange", "can_override": false}, "Q5b_P_R_L": {"name": "Q5b_P_R_L", "group": "Q5b", "definition": "random(5 .. 9#0.7)", "description": "", "templateType": "randrange", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": [], "variable_groups": [{"name": "Q5b", "variables": ["Q5b_N_prim", "Q5b_N_sec", "Q5b_P_R_L"]}, {"name": "Q5c", "variables": ["Q5c_R_L", "Q5c_C1", "Q5c_V_S", "Q5c_Z_BDV"]}], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part a) </strong><strong>Rectification Devices</strong></p>\n<p>Name and state the operating principles of the two rectification devices shown.&nbsp;</p>\n<p><img src=\"resources/question-resources/FoESELQ05_-_Rectifier_Devices.PNG\" width=\"463\" height=\"260\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p>SPICE Circuit(s) suitable for analysis <a href=\"https://www.multisim.com/content/mmtuuTBw6a7CVUuwPopezv/vacuum-tube-vs-diode-rectification/open/\">FoES Q005a</a></p>\n<p><strong>[4Marks]</strong></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part b) Transformer Calculation</strong></p>\n<p>The circuit shown in the figure below shows an ideal transformer connected to a purely resistive load.&nbsp;</p>\n<p><img src=\"resources/question-resources/FoESELQ05_-_Transformer.PNG\" width=\"595\" height=\"298\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p><strong>Transformer: Turns on Primary (N<sub>P</sub>)={Q5b_N_prim}, Turns on Secondary (N<sub>S</sub>)= {Q5b_N_sec}</strong></p>\n<p><strong>Power Dissipated in R<sub>L</sub> (P<sub>avg</sub>) = {Q5b_P_R_L}W, </strong><strong>V<sub>P(RMS</sub>) = {230}V</strong></p>\n<ul>\n<li>Calculate/determine the value of the resistor R<sub>L</sub>.</li>\n<li>Calculate/Derive the peak current in the primary winding.</li>\n<li>Plot the input and output wave forms for voltage and current.</li>\n<li>Show your workings or circuit schematic and associated results.</li>\n</ul>\n<p>SPICE Circuit Suitable for Analysis: <a href=\"https://www.multisim.com/content/HrLUAKbDb5CVrjEKaMLhEw/ideal-transformer-1/open/\">FoESElQ05b </a></p>\n<p></p>\n<p><strong>[6Marks]</strong></p>\n<p></p>"}, {"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><strong>Part c) Power Supply</strong></p>\n<p>The figure shows a circuit designed for Voltage Reduction, Rectification and Regulation of an AC power source.&nbsp;</p>\n<p><img src=\"resources/question-resources/FoESELQ05_-_DC_power_supply.png\" width=\"1194\" height=\"380\"/></p>\n<p style=\"text-align: left;\"><strong>Circuit Variables: </strong>V<sub>S</sub> = {Q5c_V_S}V<sub>RMS</sub>; C<sub>1</sub> = {Q5c_C1}mF; R<sub>1</sub>={1}&Omega;; R<sub>L</sub> = {Q5c_R_L}k&Omega;; T<sub>1</sub>: Turns on Primary Winding, &nbsp;N<sub>P</sub> = 20 and Secondary N<sub>S</sub> = 9;&nbsp; Diodes D<sub>1</sub> &amp; D<sub>2</sub>, Forward Bias Voltage = 860mV; Diode Z<sub>1</sub>, Reverse Breakdown Voltage = {Q5c_Z_BDV}V.&nbsp;&nbsp;</p>\n<p>For the component values given, explain how the circuit operates.&nbsp; Ensure that you:</p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>Draw or derive the wave forms expected/observed at each of the stages (A, B, C &amp; D).</li>\n<li>Explain why the wave form changes as it does and what role the components have and why they might have been chosen.</li>\n<li>Calculate or derive the power consumed by the load.</li>\n</ul>\n</li>\n</ul>\n<p>SPICE Circuit Suitable for Analysis: <a href=\"https://www.multisim.com/content/bKRpbm6HkuTapZcWYa4sDY/foeselq05-dc-power-supply/open/\">FoESElQ5c</a></p>\n<p><strong>[10 Marks]</strong></p>"}], "partsMode": "all", "maxMarks": 0, "objectives": [], "penalties": [], "objectiveVisibility": "always", "penaltyVisibility": "always", "contributors": [{"name": "Robert Bauld", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/19446/"}]}]}], "contributors": [{"name": "Robert Bauld", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/19446/"}]}