// Numbas version: exam_results_page_options
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A building with a <strong>$\\var{Rw}$ m x $\\var{Rl}$ m</strong> flat roof maintains a <strong>$\\var{Tr}$&deg;C</strong> temperature due to solar heat loading.</p>", "advice": "", "rulesets": {}, "extensions": ["quantities"], "variables": {"To": {"name": "To", "group": "Ungrouped variables", "definition": "random(5 .. 14#1)", "description": "", "templateType": "randrange"}, "Vw": {"name": "Vw", "group": "Ungrouped variables", "definition": "random(18 .. 21#0.1)", "description": "", "templateType": "randrange"}, "Rl": {"name": "Rl", "group": "Ungrouped variables", "definition": "random(35 .. 45#1)", "description": "", "templateType": "randrange"}, "Rw": {"name": "Rw", "group": "Ungrouped variables", "definition": "20", "description": "<p>k</p>", "templateType": "number"}, "Tr": {"name": "Tr", "group": "Ungrouped variables", "definition": "27", "description": "", "templateType": "number"}, "u": {"name": "u", "group": "Ungrouped variables", "definition": "0.000015", "description": "", "templateType": "number"}, "k": {"name": "k", "group": "Ungrouped variables", "definition": "0.0255", "description": "", "templateType": "number"}, "Pr": {"name": "Pr", "group": "Ungrouped variables", "definition": "0.71", "description": "", "templateType": "number"}, "Tf": {"name": "Tf", "group": "Ungrouped variables", "definition": "273.15+(Tr+To)/2", "description": "", "templateType": "anything"}, "Re": {"name": "Re", "group": "Ungrouped variables", "definition": "(((1000*Vw)/3600)*Rl)/u", "description": "", "templateType": "anything"}, "Nu": {"name": "Nu", "group": "Ungrouped variables", "definition": "(Pr^(1/3))*(0.037*Re^0.8-871)", "description": "", "templateType": "anything"}, "hp": {"name": "hp", "group": "Ungrouped variables", "definition": "(Nu*k)/Rl", "description": "", "templateType": "anything"}, "q": {"name": "q", "group": "Ungrouped variables", "definition": "0.001*hp*Rl*Rw*(Tr-To)", "description": "", "templateType": "anything"}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": ["To", "Vw", "Rl", "Rw", "Tr", "u", "k", "Pr", "Tf", "Re", "Nu", "hp", "q"], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "numberentry", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>What would be the film temperature to be used in reading air properties from the available tables?</p>\n<p><em><span class=\"prompt content-area\" localise-data-jme-context-description=\"part.prompt\">Provide your answer <strong>in Kelvin</strong> with only one decimal figure. For example, if your answer is 100.27 K, type 100.3 only.</span></em></p>", "minValue": "Tf-1", "maxValue": "Tf+1", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": "2", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>If the air properties are given as below, what is the Reynolds number at the length of the roof if the wind is blowing along the roof length (<strong>$\\var{Rl}$ m</strong>)?</p>\n<p><img src=\"resources/question-resources/11_i08cdyZ.png\" width=\"186\" height=\"111\"/></p>\n<p><strong><em><span class=\"prompt content-area\" localise-data-jme-context-description=\"part.prompt\">Provide your answer with at least four significant figures. Also please do not use scientific notation. For example, if your answer is 1.0278 x 10x6, type 1028000 only.</span></em></strong></p>", "minValue": "Re-5000", "maxValue": "Re+5000", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "1_n_2", "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>Based on the Reynolds number that you have calculated, what type of flow(s) do we have?</p>", "minMarks": 0, "maxMarks": 0, "shuffleChoices": true, "displayType": "radiogroup", "displayColumns": 0, "showCellAnswerState": true, "choices": ["Laminar", "Turbulent", "Laminar and turbulent"], "matrix": [0, 0, "1"], "distractors": ["", "", ""]}, {"type": "1_n_2", "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>Based on the type of flow, what Nusselt number relation is suitable to be used for calculation of the convection heat transfer coefficient?</p>", "minMarks": 0, "maxMarks": 0, "shuffleChoices": false, "displayType": "radiogroup", "displayColumns": 0, "showCellAnswerState": true, "choices": ["<img src=\"resources/question-resources/2_d1Wo0KT.png\"/>", "<img src=\"resources/question-resources/3_NvfBAxT.png\"/>", "<img src=\"resources/question-resources/4_xB9Jkgl.png\"/>", "<img src=\"resources/question-resources/5_64Ioy0N.png\"/>"], "matrix": [0, "0", 0, "1"], "distractors": ["", "", "", ""]}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": "2", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>What is the value of Nusselt number?</p>\n<p></p>\n<p><strong><em><span class=\"prompt content-area\" localise-data-jme-context-description=\"part.prompt\">Provide your answer with at least three significant figures. Also please do not use scientific notation. For example, if your answer is 1.0278 x 10x6, type 1030000 only.</span></em></strong></p>", "stepsPenalty": 0, "steps": [{"type": "information", "useCustomName": true, "customName": "Hint", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Hint: You would have to use the Nu number relation that you have selected in the previous part.</p>"}], "minValue": "Nu-150", "maxValue": "Nu+150", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": "1.5", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>What is the convection heat transfer coefficient? Provide your answer, number only, in W/m<sup>2</sup>K.</p>\n<p></p>\n<p><strong><em><span class=\"prompt content-area\" localise-data-jme-context-description=\"part.prompt\">Provide your answer with only one decimal figure. For example, if your answer is 100.27 W/m<sup>2</sup>K, type 100.3 only.</span></em></strong></p>", "stepsPenalty": 0, "steps": [{"type": "information", "useCustomName": true, "customName": "Hint", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Hint: You would have to use the Nu number that you have calculated in the previous part.</p>"}], "minValue": "hp-0.7", "maxValue": "hp+0.7", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": "1.5", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Calculate the heat loss from the roof in kW.</p>\n<p></p>\n<p><strong><em><span class=\"prompt content-area\" localise-data-jme-context-description=\"part.prompt\">Provide your answer with only one decimal figure, in kW. For example, if your answer is 100.27 kW, type 100.3 only.</span></em></strong></p>", "stepsPenalty": 0, "steps": [{"type": "information", "useCustomName": true, "customName": "Hint", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Hint: You would have to use the convection heat transfer coefficient hat you have calculated in the previous part.</p>"}], "minValue": "q-2", "maxValue": "q+2", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "showFractionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}], "partsMode": "all", "maxMarks": 0, "objectives": [], "penalties": [], "objectiveVisibility": "always", "penaltyVisibility": "always", "contributors": [{"name": "Seama Koohi", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/4775/"}]}]}], "contributors": [{"name": "Seama Koohi", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/4775/"}]}