Quiz — 6374e1cc27c53__Série1-le dipole RL-énoncé.pdf

Question 1 sur 10 20:00

[{"id":75726,"question":"Quelle est la relation entre la tension u aux bornes d'une bobine et le courant i qui la traverse ?","option_a":"u = R i","option_b":"u = L di\/dt","option_c":"u = R i + L di\/dt","option_d":"u = L i","option_e":"","option_f":"","bonne_reponse":"c","explication":"La tension aux bornes d'une bobine est donnée par u = L di\/dt, où L est l'inductance et di\/dt la dérivée du courant par rapport au temps.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"u = R i\", \"b\": \"u = L di\/dt\", \"c\": \"u = R i + L di\/dt\", \"d\": \"u =","_debug_options_count":4},{"id":75727,"question":"La constante de temps τ d'un circuit RL est définie par τ = L\/R.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"La constante de temps τ d'un circuit RL est bien définie par τ = L\/R, où L est l'inductance et R la résistance.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":75728,"question":"Dans un circuit RL en régime permanent, le courant est constant.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"En régime permanent, le courant dans un circuit RL est constant car di\/dt = 0, donc u = R i.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":75729,"question":"Quelle est l'unité de l'inductance L dans le système international ?","option_a":"Ohm (Ω)","option_b":"Henry (H)","option_c":"Farad (F)","option_d":"Volt (V)","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'inductance L s'exprime en Henry (H) dans le système international.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Ohm (Ω)\", \"b\": \"Henry (H)\", \"c\": \"Farad (F)\", \"d\": \"Volt (V)\"}}","_debug_options_count":4},{"id":75730,"question":"L'énergie magnétique emmagasinée dans une bobine est proportionnelle au carré du courant.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'énergie magnétique E = ½ L i² est bien proportionnelle au carré du courant i.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":75731,"question":"Quelle est la formule de la tension aux bornes d'un dipôle RL en régime transitoire ?","option_a":"u = R i","option_b":"u = L di\/dt","option_c":"u = R i + L di\/dt","option_d":"u = L i","option_e":"","option_f":"","bonne_reponse":"c","explication":"La tension aux bornes d'un dipôle RL en régime transitoire est u = R i + L di\/dt, combinant la loi d'Ohm et la tension aux bornes de la bobine.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"u = R i\", \"b\": \"u = L di\/dt\", \"c\": \"u = R i + L di\/dt\", \"d\": \"u =","_debug_options_count":4},{"id":75732,"question":"Le courant dans un circuit RL s'établit instantanément.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Le courant dans un circuit RL ne s'établit pas instantanément en raison de l'inductance qui s'oppose aux variations de courant.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":75733,"question":"Quelle est la valeur de la constante de temps τ pour un circuit RL avec L = 0,5 H et R = 100 Ω ?","option_a":"0,005 s","option_b":"0,5 s","option_c":"5 ms","option_d":"50 ms","option_e":"","option_f":"","bonne_reponse":"d","explication":"τ = L\/R = 0,5\/100 = 0,005 s = 5 ms.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"d\", \"options\": {\"a\": \"0,005 s\", \"b\": \"0,5 s\", \"c\": \"5 ms\", \"d\": \"50 ms\"}}","_debug_options_count":4},{"id":75734,"question":"L'inductance L d'une bobine dépend de sa géométrie et du matériau utilisé.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'inductance L dépend effectivement de la géométrie de la bobine (nombre de spires, longueur) et du matériau du noyau (perméabilité magnétique).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":75735,"question":"Quel est l'effet d'une augmentation de la résistance R sur la constante de temps τ d'un circuit RL ?","option_a":"τ augmente","option_b":"τ diminue","option_c":"τ reste inchangée","option_d":"τ devient nulle","option_e":"","option_f":"","bonne_reponse":"b","explication":"τ = L\/R, donc si R augmente, τ diminue car la constante de temps est inversement proportionnelle à la résistance.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"τ augmente\", \"b\": \"τ diminue\", \"c\": \"τ reste inchangée\", \"d\":","_debug_options_count":4}]