// Numbas version: finer_feedback_settings
{"name": "EL Q006 - Switching & Motor Control", "extensions": [], "custom_part_types": [], "resources": [["question-resources/FoESELQ06_-_BJT_vs_MOSFET_1.PNG", "/srv/numbas/media/question-resources/FoESELQ06_-_BJT_vs_MOSFET_1.PNG"], ["question-resources/FoESELQ06_-_DC_Communtated_Motor.PNG", "/srv/numbas/media/question-resources/FoESELQ06_-_DC_Communtated_Motor.PNG"], ["question-resources/FoESELQ06_-_DC_Brushless_vs_AC_Synchronous.PNG", "/srv/numbas/media/question-resources/FoESELQ06_-_DC_Brushless_vs_AC_Synchronous.PNG"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "EL Q006 - Switching & Motor Control", "tags": [], "metadata": {"description": "<p>Transistor theory and motor application</p>", "licence": "Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International"}, "statement": "<p>Transistor Switching &amp; Motor Control</p>", "advice": "<p>.</p>", "rulesets": {}, "extensions": [], "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true, "j": false}, "constants": [], "variables": {"q6b_k_t": {"name": "q6b_k_t", "group": "Ungrouped variables", "definition": "random(0.1 .. 0.2#0.02)", "description": "", "templateType": "randrange", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": ["q6b_k_t"], "variable_groups": [], "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. Transistor Packages&nbsp;</strong></p>\n<p>Name and state the operating principles of the two device types shown.&nbsp;</p>\n<p><img src=\"resources/question-resources/FoESELQ06_-_BJT_vs_MOSFET_1.PNG\" width=\"563\" height=\"351\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p><strong>[4 Marks]</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. DC Motor Speed Control</strong>.&nbsp;</p>\n<p>The diagram below shows a Series-Wound Armature-Controlled Permanent-Magnet DC motor.</p>\n<p><img src=\"resources/question-resources/FoESELQ06_-_DC_Communtated_Motor.PNG\" width=\"853\" height=\"328\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></p>\n<p><strong>Variables:&nbsp; K<sub>T</sub>= {Q6b_K_T} Nm/A,&nbsp; K<sub>E</sub> = {0.2}Vs/rad, &nbsp;T<sub>f</sub> = {0.05}Nm, I<sub>(max)</sub> = {2.4}A, </strong><strong>&omega;<sub>(max) </sub>= {5000}rpm R<sub>A</sub> = {1}</strong><strong>&Omega;</strong></p>\n<p>For the values given, calculate the following:</p>\n<ul>\n<li>The Maximum output torque (T<sub>(Max)</sub>)</li>\n<li>The Maximum Power output (P<sub>M(Max)</sub>)</li>\n</ul>\n<p><strong>[6 Marks]</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 c. Motor Comparison</strong></p>\n<p><strong><img src=\"resources/question-resources/FoESELQ06_-_DC_Brushless_vs_AC_Synchronous.PNG\" width=\"729\" height=\"410\"/></strong></p>\n<p>Compare the two technologies highlighting the advantages and disadvantages of each and for each suggest a suitable medical application that they would be best suited for.&nbsp;</p>\n<p>Ensure that you give a brief description of how each motor control type functions.&nbsp;</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/"}]}