// 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": "
Question Covering AC power and frquency response
", "licence": "All rights reserved"}, "statement": "see spread sheet
", "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": "Load Resistance (kΩ)
", "templateType": "randrange", "can_override": false}, "Q5c_C1": {"name": "Q5c_C1", "group": "Q5c", "definition": "random(1 .. 3#1)", "description": "Smoothing Capacitor (uF)
", "templateType": "randrange", "can_override": false}, "Q5c_V_S": {"name": "Q5c_V_S", "group": "Q5c", "definition": "random(20 .. 23#1)", "description": "Supply Voltage (VS)
", "templateType": "randrange", "can_override": true}, "Q5c_Z_BDV": {"name": "Q5c_Z_BDV", "group": "Q5c", "definition": "siground(dec(q5c_v_s*(3/20)),2)", "description": "Zener Diode Reverse Breakdown Voltage (V)
", "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": "Part a) Rectification Devices
\nName and state the operating principles of the two rectification devices shown.
\nSPICE Circuit(s) suitable for analysis FoES Q005a
\n[4Marks]
"}, {"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": "Part b) Transformer Calculation
\nThe circuit shown in the figure below shows an ideal transformer connected to a purely resistive load.
\nTransformer: Turns on Primary (NP)={Q5b_N_prim}, Turns on Secondary (NS)= {Q5b_N_sec}
\nPower Dissipated in RL (Pavg) = {Q5b_P_R_L}W, VP(RMS) = {230}V
\nSPICE Circuit Suitable for Analysis: FoESElQ05b
\n\n[6Marks]
\n"}, {"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": "Part c) Power Supply
\nThe figure shows a circuit designed for Voltage Reduction, Rectification and Regulation of an AC power source.
\nCircuit Variables: VS = {Q5c_V_S}VRMS; C1 = {Q5c_C1}mF; R1={1}Ω; RL = {Q5c_R_L}kΩ; T1: Turns on Primary Winding, NP = 20 and Secondary NS = 9; Diodes D1 & D2, Forward Bias Voltage = 860mV; Diode Z1, Reverse Breakdown Voltage = {Q5c_Z_BDV}V.
\nFor the component values given, explain how the circuit operates. Ensure that you:
\nSPICE Circuit Suitable for Analysis: FoESElQ5c
\n[10 Marks]
"}], "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/"}]}